JP3709797B2 - System including proxy server and web server and program thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system and server including a proxy server and a web server that are accessed through the Internet, and a program mounted on the system, and in particular, the web server that is communicatively connected to the proxy server temporarily stops operation and service operation. In particular, the present invention relates to a proxy server and system for notifying the access source of the fact and the restart date of operation and service, and a program installed therein.
[0002]
[Prior art]
A system including a conventional proxy server and a web server (a server accessed through a webnet) will be described with reference to FIG. In FIG. 13, the web client 100 requests the proxy server 200 to transmit the provided information file 304 on the web server 300 through the Internet by the client request unit 101 and the communication unit 103, and the reply information reception / display unit 102 receives the request. The reply information is analyzed and displayed on the screen.
[0003]
The proxy server 200 is a firewall that mediates Internet access of the web server 300 and the server / terminal 400 and access to these devices from the Internet so that the IP addresses of these devices are not visible from the Internet.
[0004]
When the INET (internet) communication unit 201 receives the file transmission request from the web client 1, it passes the received information to the HTTP (hypertext transfer protocol) analysis unit 202, analyzes the received information by the HTTP analysis unit, and receives the destination URL (unform resource). locator) determines the web server 300 where the requested file is located, and the communication means 203 to the web server requests the web server 300 to transmit the designated file.
[0005]
Further, the reply information receiving means 205 receives the file from the web server 300 and the client sending means 206 sends it to the web client 100.
[0006]
When the reply information receiving unit 205 cannot receive the reply information from the web server 300, the reply information receiving unit 205 requests the client sending unit 206 to notify the file fetch error, and an error has occurred in the web client 1 via the client sending unit 206. Notify that.
[0007]
Further, as a general technique for reducing the occurrence rate of file fetch error, as disclosed in Japanese Patent Laid-Open Publication No. 2000-070441 “Proxy Server and LAN System”, the proxy server 200 and the file When the file requested by the HTTP analysis unit 202 exists in the cache by making a copy and configuring the cache, the file in the cache is delivered to the client transmission unit 206 without calling the transmission unit 203 to the web server. The method is known.
[0008]
[Problems to be solved by the invention]
However, a system including a conventional proxy server and web server has the following problems.
[0009]
The first problem is that it is impossible to grasp whether the web server 300 is temporarily down or somewhere in the network path is disconnected by error notification. When the requested file information is essential information, Since the retrieval is attempted at all times, a wasteful man-hour is required for the retrieval operation, which leads to a wasteful use of the Internet or a local net (a network between the proxy server and the web server).
[0010]
In particular, useless file extraction man-hours are generated when files are extracted from the web server 300 that is not in 24-hour non-stop operation or the web server 300 that is stopped for maintenance.
[0011]
In addition, the web client user cannot grasp any of the causes of the error, such as the temporary stop of the web server 300, the failure or congestion of the network, the abolition of the service, or the destination designation error, and is dissatisfied with the service of the web server. You may gradually stop using it.
[0012]
The second problem is that since the cache mechanism has a physical upper limit, it is deleted from the cache in consideration of the access frequency or the elapsed time. Is not completely guaranteed to retrieve the file.
[0013]
The object of the present invention is to generate a page that conveys the operation information of the web server instead of the conventional error return when the subordinate web server does not return a response for some reason, and the web server is stopped. Provide proxy server and web server systems, servers, and programs installed in them to increase the chances of acquiring information by reducing the scheduled restart time to the web client and reduce unnecessary file retrieval man-hours and communication There is to do.
[0014]
[Means for Solving the Problems]
A system including a first proxy server and a web server of the present invention includes a proxy server that is communicatively connected to the Internet and one or more web servers that are communicatively connected to the proxy server, and is accessed by a web client via the Internet. The proxy server analyzes the request information from the web client and determines the web server on which the requested information is placed, and transmits the request information to the web server Means for receiving information requested by the web client as reply information from a web server, means for sending to the client for sending reply information to the request source, means for detecting that reply information could not be received And store fixed and variable outages for each web server The stop information data and the detection and request source information are received, the corresponding stop information of the web server is extracted from the stop information data, and the operation of the web server is stopped based on the stop information after confirming that the stop time is in the stop period. A stop information page including a request information and a stop information extraction / transmission unit that includes the request source information and a stop information extraction / transmission unit that includes the stop information page. Upon receipt, a stop information page is transmitted to the requesting web client instead of reply information.
[0015]
A system including a second proxy server and a web server according to the present invention is the first system, wherein the web server adds, updates, and deletes stop information in accordance with an operator's instruction and input information. Means for stopping information transmitting means for transmitting instructions and contents to the proxy server, wherein the proxy server receives instructions for adding, updating, and deleting stop information and contents from the subordinate apparatus connected to the communication and updates the stop information data It is characterized by also having.
[0016]
In the system including the third proxy server and the web server according to the present invention, in the second system, the stop information transmission unit of the web server performs the process according to an instruction or input information of an operator. Receives system down notification of its own device, generates stop information with its time information embedded, automatically sends it to the proxy server, and checks whether or not the automatic transmission of the stop information has been executed upon successful restart of its own device If so, a stop information deletion instruction is also transmitted.
[0017]
The first proxy server of the present invention is a proxy server that communicates and connects a web server to the subordinate and connects to the Internet. The requested information is analyzed by analyzing request information from a web client on the Internet. Analyzing means for determining a web server; transmitting means for transmitting the request information to the web server; means for receiving information requested by the web client as return information from the web server; Means for transmitting to the client to send to the request source, means for detecting that the reply information could not be received, stop information data storing a fixed stop period and a variable stop period of each web server, The detection is received together with the requester information, and the corresponding stop information of the web server is extracted from the stop information data. Confirm that the suspension period is in progress, and create a stop information page including the fact that the web server is stopped, the reason for the stop, and the scheduled restart time based on the stop information, and pass it to the client sending means together with the request source information It has stop information extraction / transmission means, and when the transmission means to the client receives the stop information page, the stop information page is transmitted to the requesting web client instead of reply information.
[0018]
In the second proxy server of the present invention, in the first proxy server, the transmission means to the web server has a transmission buffer corresponding to the destination web server, and is read from one entry of the buffer. When the communication means is instructed to transmit the request information, the time is added to the entry, the reply information receiving means clears the entry corresponding to the received information in the transmission buffer, and the detecting means transmits to the transmission buffer. It is characterized in that it is detected that the reply information could not be received by periodically checking whether there is request information whose designated time is a predetermined time before the current time.
[0019]
In the third proxy server of the present invention, in the first proxy server, the transmission unit to the web server also includes the detection unit, and the communication unit transmits the request information when instructing the communication unit to transmit the request information. The detection is performed by detecting that the connection with the destination web server has failed.
[0020]
In the fourth proxy server of the present invention, in the first proxy server, the proxy server detects that the reply information has not been received, and the stop information extraction / transmission means returns the reply information from the stop information data. If there is a stop flag for each web server that is turned on if the time is within the stop period, the analysis means analyzes the request information from the web client and is requested. When determining the web server where the information is placed, the stop flag is checked, and if it is on, the request information transmission request to the web server is suppressed, and the stop information retrieval and transmission means is identified with the web server identification and the request source information. It is characterized in that confirmation of stop information and transmission are instructed.
[0021]
The web server of the present invention transmits instructions and contents for adding, updating, and deleting stop information to the upper proxy server according to the instructions and input information of the operator, and receives a system down notification of its own device. Generates stop information with embedded time information and automatically sends it to the proxy server. Upon successful restart of the device itself, checks whether execution of automatic transmission of the stop information is performed. It is characterized by having stop information transmission means.
[0022]
The first program of the present invention is a program that is installed in a proxy server that is connected to a web server under communication and is connected to the Internet, and is information requested by analyzing request information from a web client on the Internet. An analysis procedure for determining the web server on which the web server is placed, a transmission procedure to the web server for transmitting the request information to the web server, and a procedure for receiving information requested by the web client as return information from the web server And a procedure for sending the reply information to the requester to the client, a procedure for detecting that the reply information could not be received, and a suspension that stores a fixed suspension period and a variable suspension period for each web server. Information data, and the detection information of the web server that receives the detection together with the request source information And confirms that the suspension period is in progress, and creates a stop information page including the fact that the operation of the web server is stopped, the reason for the stop and the scheduled restart time based on the stop information, and sends it to the client together with the request source information. Sending handorderStop information retrieval and transmission hand to pass toA program for causing a server computer to execute the order, Sending procedure to the clientTheWhen the stop information page is received, the stop information page is sent to the requesting web client instead of the reply information.ProcedureAnd features.
[0023]
The second program of the present invention is the first program installed in the proxy server,, Said cSending procedure to web serverIn addition,Send buffer corresponding to destination web serverUseWhen the communication procedure is instructed to transmit the request information read from one entry in the buffer, the time is added to that entry.Including the procedure, Procedure for receiving the reply informationInClear the entry corresponding to the reception information in the transmission buffer.Including procedures, The inspectionHand outorderTheDetects that the reply information could not be received by periodically checking whether there is request information whose transmission instruction time is a predetermined time before the current time in the transmission buffer.ProcedureAnd features.
[0024]
A third program of the present invention is the first program, and a transmission procedure to the web serverIn addition,When the communication procedure is instructed to send request information, the communication procedure detects that the connection with the destination web server has failed.ShiDetectionIncluding proceduresIt is characterized by that.
[0025]
A fourth program according to the present invention is the first program, whereinRegistrationStop information retrieval and transmission procedure,The stop information of the web server that did not respond is extracted from the stop information data, andAt the time ofIf the time is in the suspension periodBaIncluding the procedure of turning on the stop flag for each web server,In addition,When analyzing the request information from the web client and determining the web server where the requested information is located, the stop flag is checked, and if it is on, the request information is not sent to the web server and the stop information is suppressed. The web server identification determined in the retrieval and transmission procedure, the sender information, and the confirmation and transmission of stop information are instructed.This includes proceduresAnd features.
[0026]
A fifth program of the present invention is a program installed in a web server, and transmits instructions and contents for adding, updating, and deleting stop information to an upper proxy server in accordance with instructions and input information from an operator. DoProcedure andUpon receipt of the system down notification of its own device, it generates stop information embedded with the time information, automatically transmits it to the proxy server, and checks whether or not automatic transmission of the stop information is executed when the own device is restarted successfully. Stop information transmission procedure to send stop information deletion instruction if completedAre executed on the server computer.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a system including a proxy server and a web server according to the present invention, and a web client side using the system.
[0028]
The system of the present invention comprises a proxy server 2 connected to the Internet 7, and web servers 3,... 4 and a management terminal 5 connected thereto via local communication means such as a LAN 6 and the like.
[0029]
Further, a web client 1 using the system of the present invention is connected to the Internet 7 via, for example, a public telephone line 9 and a dial-up server 8. The web client 1 requests the proxy server 2 to transmit the provided information file on the web server 3 and browses the received file.
[0030]
The proxy server 2 is connected to the LAN 6 from the web server 3,... 4, the management terminal 5, another server or client terminal (not shown) to the Internet 7 connection device, or connected from the Internet 7 connection device to the LAN 6. It is conventional that the access to the device is mediated so that the IP address of the LAN6 connection device is not visible from the Internet 7, but the subordinate web servers 3,... 4 do not return a response for some reason. Sometimes, instead of the conventional error return, a file containing the operation information of the web servers 3 and 4 is generated, and the web client is informed of the reason that the web server has stopped and the scheduled restart time. To do.
[0031]
FIG. 2 is a block diagram showing a specific configuration example of the web client 1. The web client 1 is a personal computer, a web terminal device, or the like, and client request means 11 for accessing the URL requested by the client and return information receiving / display means for receiving and analyzing the provided information from the requested URL and displaying it on the display device 13 12 and communication means 14.
[0032]
The web client 1 may be a mobile phone or a mobile terminal having a browsing processing function. In this case, the web client 1 is connected to the Internet 7 not by the public telephone line 9 but by a wireless network including a base station.
[0033]
FIG. 3 is a block diagram showing a detailed configuration example of the system of the present invention including the proxy server 2 and the web server 3. The proxy server 2 includes an INET (Internet) communication unit 20, an HTTP analysis unit 21, address conversion information 212, a web server transmission unit 22, an LNET (local net) communication unit 29, a reply information reception unit 23, a client transmission unit 26, a reply It includes a monitoring unit 24, a stop information extraction / transmission unit 25, a stop information DB (database) 28, and a stop information DB update unit 27.
[0034]
The INET communication means 20 is connected to the Internet 7 and has an Internet communication function. That is, the IP address of the proxy server 2 is held, information having the same destination IP address is received, the destination IP address received from the client transmission unit 26 is set as the destination address, and the IP address of the own apparatus is set as the source to the Internet 7. Send.
[0035]
The HTTP analysis unit 21 includes a reception buffer 211 having a plurality of entries, and stores information from the client received from the INET communication unit 20 in the reception buffer 211. These are sequentially extracted and analyzed, and the portion corresponding to the web server of the destination URL is converted into the host name of the web server using the address conversion information 212. Then, information (data, transmission source information) from the client is passed to the web server transmission means 22 with the destination host name attached.
[0036]
The web server transmission means 22 has a transmission buffer 221 for each web server, and stores the received information from the client in the corresponding transmission buffer. The LNET communication unit 29 is instructed to sequentially read information from each buffer and transmit it to the corresponding web server. The instruction time (for example, 1 second to 0.5 second unit) is added to the corresponding entry of the transmission buffer 221.
[0037]
The LNET (local net) communication unit 29 transmits the information received from the web server transmission unit 22 or the stop information DB update unit 27 to the other party's LNET communication unit 39 or the like. The destination host name received in association with the information is converted into an IP address by DNS (Domain Name System) or the like to obtain the destination IP address, and the source IP address (own device IP address) is added to transmit the information.
[0038]
If the destination IP address of the information from the web server or the management terminal is its own device IP address, it is received and passed to the reply information receiving means 23 and the stop information DB updating means 27 according to the higher layer destination. When passing, the source IP address is converted to a host name as necessary.
[0039]
When the reply information receiving means 23 receives the provided information file from the web server 3... 4 via the LNET communication means 29, the reply information receiving means 23 extracts the information from the buffer corresponding to the transmission source host name of the transmission buffer 221 and clears the entry. . Out of the extracted information, the transmission source information is used as destination information, and is delivered to the client transmission means 26 together with the provided information file.
[0040]
The client transmission means 26 receives the provided information file and the destination information (destination IP address, etc.) from the reply information receiving means 23 or receives the stop information page and the destination information from the stop information extraction / transmission means 25 via the INET communication means 20. To the web client 1).
[0041]
The reply monitoring unit 24 periodically checks (for example, every 4 seconds) whether each transmission entry in the transmission buffer 221 has a transmission instruction time that is a predetermined time (for example, 8 seconds) before the current time. When request information from a client for which reply information has not been received even after a predetermined time has passed after the transmission instruction to the LNET communication means 29 is detected, information on the entry is extracted (at the same time deleted from the buffer), and source information (on the Internet 7) Destination information), host name, and instruction (stop information extraction / transmission instruction) are passed to the stop information extraction / transmission means 25.
[0042]
The stop information DB 28 includes a fixed information table including the operation time and stop data identification (ID) of each web server (host name), and a variable information table 2 including a plurality of stop data.
[0043]
The stop information extraction / transmission means 25 extracts stop information corresponding to the host name from the stop information DB 28, confirms that the current time of acquisition from the calendar clock is the stop period of the web server, and stops information page based on the stop information. Is sent to the client transmission means 26 together with the destination information.
[0044]
The stop information DB update means 27 receives a read request for registered stop information and a request for additional update of stop information from the stop information transmission means 34 of the web server 3 and the stop information update means 53 of the management terminal 5, and Reply and stop information DB28 are updated.
[0045]
The web server 3 includes HTTP analysis means 31, reply information transmission means 32, provided information file group 33, stop information transmission means 34, stop information file group 36, input / output means 35, operation control means 37, and LNET communication means 39. .
[0046]
The HTTP analysis unit 31 analyzes the request information from the web client 1 and calls the return information transmission unit 32 if the return information is requested. The reply information transmission unit 32 reads the designated provision information file from the provision information file group 33 and transmits it to the reply information reception unit 23 of the proxy server 2.
[0047]
The input / output means 35 is an input / output device such as a keyboard and a display device. The stop information file group 36 is a stop information file created by the server administrator or a template file for creation. The operation control unit 37 controls and manages the state of the web server 3 (operation state, failure state, standby state, operation power off state).
[0048]
The stop information transmission unit 34 receives an instruction from the input / output unit 35 and transmits an instruction to update the stop information and an update file to the stop information DB update unit 27. In addition, the system down notification is received from the operation control means 37, the time information is added to the stop information, the stop information DB update means 27 is instructed to register, and the stop information registered by the restart is instructed to be deleted automatically.
[0049]
The management terminal 5 is a terminal that allows the server administrator to manage the server from his / her desk. The stop information update means of this apparatus is the same as the stop information transmission means 34 except for the automatic registration / deletion function of stop information when the system is down. With the function of.
[0050]
FIG. 4 is a diagram showing an example of the address conversion information 212. The address conversion information 212 is information indicating the correspondence between the URL name and the host name of the web server. For example, the ma1. abc. co. jp indicates that the host name is a web server with Ma1.
[0051]
FIG. 5 shows an example of stop information created by the server administrator using the input / output means 35 or generated when the system is down. In this example, information that the host name “Ma2” is not operated for 24 hours but is stopped from 8:00 am to 10:00 pm and that all day operation is stopped on November 11, 2000 is stored. ing. Such stop information is transmitted to the stop information DB updating means 27 and added or updated to the stop information DB 28.
[0052]
An example of information storage in the stop information DB 28 is shown in FIG. In this example, it has the fixed information table (1) regarding each web server apparatus, and the variable information table (2) which takes in some stop data. In this example, the host Ma1 is operated for 24 hours, and it is stopped from 00:00 to 2pm on 10/10 and from 00:00 to 2pm on 10/11, and the host Ma2 is started from 8:00 am It is described that the car is only operated until 10pm.
[0053]
Therefore, when the web client 1 accesses the URL (ma1) of the web server of the host name Ma1 at 1/10 pm on 10/10, the stop information extraction / transmission means 25 receives the instruction from the reply monitoring means 24, and the information of this DB is received. Originally, a stop information page “ma1 is currently out of service. Scheduled to resume at 2 pm” is returned to the web client 1.
[0054]
In addition, when accessing ma2 at 11:00 pm on 10/10, based on the information in this DB, “Ma2 is currently out of operation. This URL is not operated 24 hours. Operation time is 8 am It is from 10:00 to 10:00 pm, so please come again within the driving time. "You can return the stop information page to the web client 1.
[0055]
In addition, ID3 in the variable information table (2) is automatically registered with the stop time when the Ma2 system is down by the stop information transmission unit 34, and is deleted when restarted. In this way, it is possible to notify that the operation of the web server is stopped even in the case of an emergency stop instead of a planned stop.
[0056]
These fixed information table and variable information table are loaded into the main memory when the proxy server 2 is started up.
[0057]
Next, the operation of this embodiment will be described with reference to the drawings. First, the operations of the web server 3 and the proxy server 2 when the server administrator newly registers or updates stop information from the input / output means 35 of the web server 3 will be described with reference to the flowchart of FIG.
[0058]
The server administrator makes a new registration / update request for stop information from the input / output means 35 (step A1). If it is a new registration request (step A2), the stop information transmission means 34 acquires a stop information input template from the stop information DB update means 27 or the stop information file group 36 and displays it on the input / output means 35 (step A3).
[0059]
Next, the server administrator inputs the host name (Ma1) and the scheduled stop (stop date / time stop time-restart time) on the screen, and instructs transmission (step A4).
[0060]
When the administrator designates change or deletion of the registered stop information in step A2, the stop information transmission means 34 inputs the host name (Ma1) to the administrator and updates the stop information DB together with the acquired host name. It transmits to the means 27 (step A5).
[0061]
The stop information DB update means 27 reads out the stop information of Ma1 from the fixed information table and the fluctuation information table of the stop information DB 28 and returns it (step A6). The stop information transmitting unit 34 displays the received stop information on the input / output unit 35 (step A7), and the server administrator changes or deletes the stop information on the screen and instructs to update the stop information DB 28 (step A8).
[0062]
Upon receipt of the instruction in step A4 or step A8, the stop information transmission processing means 34 transmits the input information, post-change information or deletion instruction to the stop information DB update means 27 (step A9).
[0063]
The stop information DB update unit 27 updates the stop information DB 28. That is, the variable information is added to ID2, and “2” is added to the scheduled stop column of Ma1 of the fixed information. Alternatively, the variable information is overwritten with the changed information, or the variable information is deleted, and the corresponding ID is deleted from the scheduled stop column of Ma1 of the fixed information (step A10).
[0064]
Next, with reference to the flowchart of FIG. 8, automatic registration of stop information when the web server 3 goes down and automatic deletion operation after restart will be described.
[0065]
When the stop information transmission unit 34 receives the system down notification from the operation control unit 37 (step B1), the stop information transmission unit 34 first acquires a stop information notification template from the stop information file group 36, then acquires the date and time from the calendar clock, The time is written in the template and sent to the stop information DB update means 27. Then, the stop information transmission completion flag is written in a nonvolatile memory (for example, a battery-backed CMOS memory or a hard disk) (step B2).
[0066]
The stop information DB update unit 27 receives the stop information and registers it in the stop information DB 28. That is, the variable information is added and the identification is added to the stop schedule column of the corresponding fixed information (step B3).
[0067]
When the repair work is performed and the web server 3 is restarted (step B5), it is confirmed that there is no system down notification (step B6), and the non-volatile storage stop information transmission flag is checked (step B7). If it is on, a stop information deletion instruction is transmitted to the stop information DB updating means 27 and the stop information transmission flag is turned off (step B8).
[0068]
Receiving this, the stop information DB updating means 27 deletes the fluctuation information of Ma2 from the stop information DB 28 (step B9).
[0069]
Next, the operation when the system of this embodiment receives a provision information file request from the web client 1 will be described with reference to the flowcharts of FIGS. First, the operation when the web server is in operation will be described.
[0070]
Referring to FIG. 9, when the user of the web client 1 requests to browse the destination URL as the provision information file 33-1 of the web server 3, the destination URL is passed to the communication unit 14 by the client request unit 11, and is sent to the dial-up server 8. These are sent, the IP address of the URL is acquired, and the request information is sent to the proxy server 2 through the Internet 7 (step C1).
[0071]
The INET communication unit 20 receives information (data, destination information, transmission source information) from the client and passes it to the HTTP analysis unit 21 (step C2).
[0072]
The HTTP analysis means 21 stores the received information in the reception buffer 211 (step C3). The HTTP analysis means 21 extracts the client request information from the reception buffer 211, converts the destination URL into the host name-file designation of the web server 3 using the address conversion information 212, and stores it in the buffer corresponding to the host name of the transmission buffer 221. Store (step C4).
[0073]
The web server transmission means 22 reads the client request information from the transmission buffer 221 and makes a transmission request to the LNET communication means 29, and adds the transmission instruction time to the corresponding entry in the corresponding buffer of the transmission buffer 221 (step C5).
[0074]
Moving to FIG. 10, the LNET communication means 29 converts the IP address of the destination host, requests communication connection to the LNET communication means 39 (step C6), and is connected for communication (step C7). The LNET communication means 39 of the web server 3 receives the client request, is analyzed by the HTTP analysis means 31, and the reply information transmission means 32 reads the requested provision information file, and sends it to the reply information reception means 23 of the proxy server 2. Transmit (step C8).
[0075]
The reply information receiving means 23 receives the provided information file through the LNET communication means 29, extracts the corresponding client request information from the buffer corresponding to the web server 3 of the transmission buffer 221 (clears the buffer entry), and sends the source information (web client). 1) is sent to the client transmission means 26 as destination information (step C9).
[0076]
Returning to FIG. 9, the client transmission unit 26 transmits the provided information file to the destination (web client 1) (step C <b> 10), and the reply information receiving / display unit 12 analyzes the provided information file in the web client 1, Display (step C11).
[0077]
If the transmission instruction time is added to the corresponding entry in the corresponding buffer of the transmission buffer 221 in step C5, this entry is cleared by the step C9 within a predetermined time, although it is subject to monitoring by the reply monitoring means 24 (step C12). There is no timeout.
[0078]
Next, an operation when a request from the web client 1 is received during the stop period of the web server 3 will be described.
[0079]
Steps C1 to C5 are the same as described above, and monitoring by the reply monitoring unit 24 is started after step 5, and information in the transmission buffer 221 that the transmission request time is a predetermined time before the current time (for example, 8 seconds before) is present. The reply monitoring unit 24 extracts the corresponding information from the transmission buffer 221 and passes the destination information to the stop information extraction / transmission unit 25 (step C13).
[0080]
The stop information retrieval / transmission means 25 reads the stop information from the stop information DB 28 using the host name as a key (step C14), compares the information with the current date and time, and creates a stop information page based on the stop information if it is a stop period. , It is sent to the client transmission means 26 together with the destination information (request source). If it is not the stop period, the fact of abnormal termination and the destination information are passed to the client transmission means 26 (step C15).
[0081]
The client transmission unit 26 transmits the stop information page to the destination (web client 1) (step C10), and the reply information reception / display unit 12 displays the stop information page on the display device 13 (step C11).
[0082]
As a result, the client knows that the requested file has not been returned, the reason, and the restart date and time of the requested URL.
[0083]
Next, another example of this embodiment will be described. Referring to FIG. 3, in this embodiment, the proxy server 2 does not have the reply monitoring means 24 for monitoring whether the reply information is received at a predetermined time, and the web server sending means 22B has not been able to send to the partner web server. The stop information is extracted and transmitted.
[0084]
With reference to FIG. 9, the operation of this embodiment will be described with respect to the differences from the previous embodiment. The web server transmission means takes out the client request information from the transmission buffer 221 and instructs the LNET communication means 29 to transmit it, and then waits for the result (step C5).
[0085]
Moving to FIG. 10, the LNET communication means 61 converts the IP address of the destination host, makes a communication connection request to the LNET communication means 62 (step C6), and if the communication connection fails (step C7), the web server transmission means 22B instructs the stop information extraction / transmission means 25 together with the transmission source information and the destination host name in the client request information to extract and transmit the stop information (step C16).
[0086]
Returning to FIG. 9, the stop information extraction / transmission means 25 performs the operations of Steps C14 and C15, the client transmission means 26 performs the operation of Step 10, and the reply information reception / display means 12 of the web client 1 displays the stop information page. It is displayed on the display device 13.
[0087]
If the operation of disabling the connection between the LNET communication means 39 and the LAN 6 can be performed when the operation of the web server 3 is stopped, the object of the present invention can also be achieved by the system of this embodiment.
[0088]
In the first embodiment, both the monitoring of the reply information by the reply monitoring unit 24 and the detection of the transmission failure by the web server transmitting unit may be performed, and each may instruct the stop information extracting / transmitting unit 25.
[0089]
Next, a second embodiment of the system of the present invention will be described. Referring to FIG. 11, in this embodiment, a stop flag indicating that each web server has entered a stopped state is provided for each web server in address conversion information 212 </ b> A of proxy server 2 </ b> A (address conversion information 212 </ b> A is a dotted line portion in FIG. 4. Including the content).
[0090]
When the HTTP analysis unit 21A analyzes the request information from the web client 1 and converts the destination URL to the destination web server (host name), if the stop flag is checked and it is on, the web server transmission unit at that time 22 calls are stopped, and stop information retrieval, confirmation, and transmission are instructed.
[0091]
Also, the stop information retrieval / transmission means 25A is an access from the initial client after the web server 3 enters the stop state, and upon receiving an instruction from the reply monitoring means 24, confirms the stop information and turns on the corresponding stop flag, If an instruction is received from the HTTP analysis means 21A in the first access after returning to the operating state, the corresponding stop flag is turned off if it is not the stop period, and the HTTP analysis means 21A sends the client request information to the web server 3. Is instructed to send. Other than these, the second embodiment is the same as the first embodiment.
[0092]
Next, operations of the proxy server 2A and the web server 3 of the present embodiment will be described with reference to the flowcharts of FIGS.
[0093]
First, the case where the web server 3 is operating will be described. The INET communication means 20 receives the request and passes information from the client to the HTTP analysis means 21A (step D1). The HTTP analysis means 21A analyzes the information from the client, refers to the address conversion information 212A, converts the destination URL to the host name of the web server, and checks the corresponding stop flag (step D2).
[0094]
The stop flag is off (step D3), and the converted client request information is stored in the corresponding buffer of the transmission buffer 221 (step D4).
[0095]
The web server transmission unit 22 reads the client request information from the transmission buffer 221 and instructs the LNET communication unit 29 to transmit it, and adds the transmission instruction time to the corresponding entry in the corresponding buffer of the transmission buffer 221 (step D5).
[0096]
Thereafter, the operations of Step C6, Step C7, Step C8 and Step C9 shown in FIG. 10 are performed, and the client transmission means 26 transmits the return information to the destination (web client 1) (Step D6).
[0097]
Next, a case where the web server 3 is stopped will be described. When the provision information file request from the web client 1 is received, the processing operations of steps D1 to D5 are performed as described above, and the transmission instruction time is added to the client request information of the latest entry of the web server 3 corresponding buffer of the transmission buffer 221. This entry becomes the monitoring target of the reply monitoring means 24.
[0098]
It is determined that there is information for a predetermined time before the transmission instruction time (step D7), and the reply monitoring unit 24 extracts the relevant information and passes it to the stop information extraction / transmission unit 25 (step D8). The stop information extraction / transmission means 25 reads the stop information of the corresponding host name from the stop information DB 28 (step D9), and the current date and time (obtained from the calendar clock) is in the stop period (step D10). A stop information page is created and delivered to the client transmission means 26 together with the destination information. Further, the call source is the reply monitoring means 24 (assuming that the stop flag is off), and the stop flag of the corresponding host name is set on (step D11).
[0099]
The client transmission means 26 transmits the stop information page to the destination (web client 1) (step D6).
[0100]
When the provision information file request of the web server 3 is received after the stop flag is set, the processing operations of the steps D1 and D2 are performed and the stop flag is turned on (step D3), and the HTTP analysis means 21A executes the web server 3 Request information transmission (call of the web server transmission means 22) to the server is suppressed, and the host name, transmission source information (IP address of the web client 1), and instruction (confirmation and transmission of the stop information) are sent to the stop information extraction / transmission means 25A. (Step D12).
[0101]
The corresponding stop information is read from the stop information DB 28 (step D9), and since it is a stop period (step D10), the processing operations of steps D11 and D6 are performed as described above.
[0102]
When the first access request is received from the web client 1 after the web server 3 returns to the operating state, the processing operations of steps D1, D2, D3, D12, D9, and D10 are performed, and the stop information extraction / transmission means 25A The call source is the HTTP analysis means 21A (assuming that the stop flag is on), the stop flag is turned off, and the HTTP analysis means 21A is instructed to transmit the client request information being suppressed to the web server 3. If the request source is the reply monitoring unit 24 or the web server transmission unit 22, the fact of abnormal termination and the destination information are passed to the client transmission unit 26 (step D13).
[0103]
In the description of the first and second embodiments, the destination web server identification is the host name. However, the IP address of the web server or the end number may be used instead of the host name. In this case, the address translation information 212, 212A and the host name column of the stop information are the IP address or the end number.
[0104]
In the description of the first and second embodiments, the cache mechanism of the proxy server 2 has not been specifically described. However, the present invention can coexist with the cache mechanism according to the conventional technology of the proxy server 2. This is not a limitation of the present invention.
[0105]
That is, before the HTTP analysis means 21 converts the URL name to the host name, if the cache directory is indexed by the URL and hits, the provided information file on the cache is returned, and the subsequent processing operation (stop information extraction / transmission means) 25 calls or the like) is not performed, so the cache is effectively used even when the web server 3 is stopped.
[0106]
Also, if the directory index of the cache misses during the stop period, when the client transmission means 26 returns stop information, this is registered in the cache in a form that can be recognized as stop information on the directory, and the stop information is displayed by resetting the stop flag. You can invalidate directory entries with
[0107]
【The invention's effect】
As described above, when the proxy server 2 fails to obtain the requested provision information, the system of the present invention returns the stop information including the reason and the scheduled restart time instead. It is possible to easily grasp whether it is a failure or a network trouble, and the client has a first effect that it can grasp the shortest timing of re-access to the request information.
[0108]
Therefore, the client can perform information retrieval more efficiently and has a second effect of reducing the possibility of missing necessary information.
[0109]
In the system according to the second embodiment of the present invention, when the proxy server determines the web server including the requested URL, the request information transmission to the web server is suppressed and switched to the stop information transmission process. There is also a third effect that the retry of the communication connection to the stopped web server is prevented and the influence on the service by the local net or other operating web servers can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a system including a proxy server and a web server of the present invention, and a web client side using the system.
FIG. 2 is a block diagram showing a specific configuration of the web client 1 of FIG.
FIG. 3 is a block diagram showing a detailed configuration of a system according to the first embodiment of the present invention including a proxy server 2 and a web server 3;
4 is a diagram showing an example of the address conversion information 212 of FIG. 3 and the address conversion information 212A of FIG.
5 is a diagram showing an example of stop information generated by the server administrator using the input / output means 35 of FIG. 3 or generated by the stop information transmitting means 34 of FIG. 3 when the system is down.
6 is a diagram showing an example of information storage in the stop information DB 28 of FIG. 3;
7 is a flowchart showing operations of the web server 3 and the proxy server 2 when a server administrator newly registers or updates stop information from the input / output means 35. FIG.
FIG. 8 is a flowchart showing automatic registration of stop information and automatic deletion operation after restart when the web server 3 of FIG. 3 goes down.
FIG. 9 is a flowchart showing an operation when the system according to the first embodiment of the present invention receives a provision information file request from the web client 1;
FIG. 10 is a flowchart showing an operation when the system according to the first embodiment of the present invention receives a provision information file request from the web client 1;
FIG. 11 is a block diagram showing a detailed configuration of a proxy server 2A in the system according to the second embodiment of this invention.
FIG. 12 is a flowchart showing the operation of the system according to the second embodiment of the present invention.
FIG. 13 is a diagram for explaining a system including a conventional proxy server and a web server.
[Explanation of symbols]
1 Web client
11 Client request means
13 Display device
14 Communication means
2 Proxy server
20 Communication means
20 INET communication means
21, 21A HTTP analysis means
211 Receive buffer
212 Address translation information
212A Address translation information (with stop flag)
22, 22B Web server transmission means
221 Transmission buffer
23 Reply information receiving means
24 Reply monitoring means
25, 25A Stop information retrieval / transmission means
26 Client transmission means
27 Stop information DB update means
28 Stop information DB
29 LNET communication means
3 Web server
31 HTTP analysis means
32 Reply information transmission means
33 Provided information file group
34 Stop information transmission means
35, 52 Input / output means
36 Stop information file group
37 Operation control means
39, 51 LNET communication means
5 management terminals
53 Stop information update means
6 LAN
7 Internet
8 Dial-up server
9 Public telephone line

Claims (13)

A system that includes a proxy server connected to the Internet and one or more web servers that are connected under the control of the proxy server, and that is accessed by a web client via the Internet. The proxy server analyzes request information from the web client. And analyzing means for determining the web server where the requested information is placed, transmitting means for transmitting the request information to the web server, and returning information requested by the web client from the web server. Means for receiving as information, means for sending to the client that sends reply information to the requester, means for detecting that reply information could not be received, and a fixed suspension period and variable suspension of each web server The stop information data storing the period and the detection and request source information are received. Take out the corresponding stop information of the web server from the data, confirm that the stop time is in progress, and stop the stop information page that includes the reason for the stop and the scheduled restart time based on the stop information. A stop information extraction / transmission means that creates and sends the request information to the transmission means to the client together with the request source information, and when the transmission means to the client receives the stop information page, the stop information page is used instead of the reply information. A system including a proxy server and a web server, The web server has stop information transmitting means for transmitting an instruction and content for adding, updating, and deleting stop information to the proxy server according to an instruction and input information of an operator, and the proxy server 2. The system including a proxy server and a web server according to claim 1, further comprising means for updating stop information data in response to a stop information addition, update, or deletion instruction or content from the subordinate apparatus. The stop information transmission means of the web server performs the processing according to the operator's instruction and input information, receives the system down notification of its own device, generates the stop information embedded with the time information, and automatically generates it to the proxy server 3. The proxy server and the web according to claim 2, wherein when the restart of the own device is successful, the presence / absence of automatic transmission of the stop information is checked, and if it has been transmitted, an instruction to delete the stop information is also transmitted. A system that includes a server. A proxy server that communicates and connects a web server to the subordinate, and communicates and connects to the Internet, analyzing the request information from a web client on the Internet, and analyzing means for determining the web server on which the requested information is placed; Means for transmitting the request information to the web server, means for receiving the information requested by the web client as return information from the web server, and means for transmitting to the client the reply information to the request source Means for detecting that the reply information could not be received, stop information data storing a fixed stop period and a variable stop period of each web server, and the stop information received with the request source information. Take out the corresponding web server outage information from the data, confirm that it is in the outage period and stop A stop information takeout transmission means that creates a stop information page that includes the fact that the operation of the web server is stopped based on the information, the reason for the stop, and the scheduled restart time, and passes to the transmission means to the client together with the request source information, A proxy server characterized in that, when a transmission means to a client receives a stop information page, the stop information page is transmitted to the requesting web client instead of reply information. The transmission means to the web server has a transmission buffer corresponding to the destination web server, and when the communication means is instructed to transmit the request information read from one entry of the buffer, the time is added to the entry. The reply information reception means clears the entry corresponding to the reception information in the transmission buffer, and the detection means periodically determines whether there is request information whose transmission instruction time is a predetermined time before the current time in the transmission buffer. 5. The proxy server according to claim 4, wherein the proxy server detects that the reply information cannot be received by checking. The transmission means to the web server also includes the detection means, and when the communication means instructs the communication means to transmit request information, the communication means detects that the connection with the destination web server has failed, and performs the detection. The proxy server according to claim 4. If the proxy server detects that the reply information has not been received, the stop information extraction / transmission means extracts the stop information of the web server that has not returned from the stop information data, and the time is within the stop period. It also has a stop flag for each web server that is turned on, and when the analyzing means analyzes the request information from the web client and determines the web server where the requested information is placed, the stop flag is checked, 5. If requested, transmission of request information to the web server is inhibited, web server identification and request source information are passed to the stop information extraction / transmission means, and confirmation and transmission of stop information is instructed. The listed proxy server. In accordance with the operator's instructions and input information, sends instructions and details for adding, updating, and deleting stop information to a higher-level proxy server. Is generated and automatically transmitted to the proxy server, and when the restart of the own apparatus is successful, the presence or absence of automatic transmission of the stop information is checked. A web server characterized by that. It is a program installed in a proxy server that communicates with a web server under its control and communicates with the Internet, analyzes request information from web clients on the Internet, and determines the web server where the requested information is located An analysis procedure, a transmission procedure to the web server for transmitting the request information to the web server, a procedure for receiving information requested by the web client as return information from the web server, and a transmission of the return information to the request source A transmission procedure to the client, a procedure for detecting that the reply information could not be received, stop information data storing a fixed stop period and a variable stop period for each web server, and the request source information. The corresponding stop information of the web server is extracted from the stop information data received, and the time is the stop period. Confirmation stop information to be passed to the transmission procedure to the client together to create a stop information page request based on information including the fact and the reason for stopping and resuming scheduled time that has stopped the operation of the web server based on the stop information that is and a take-out transmission procedures a program to be executed by the server computer, that sends to the requesting web client to stop information page instead of the receive and reply information stop information page of the transmission procedure to the client procedure program which is characterized that you and. Wherein a program to be installed in the proxy server, the transmission procedure to the c Ebusaba corresponds to the destination web server using the transmission buffer, an instruction to transmit the request information read out from one of the entries in the buffer to the communication procedure includes a procedure for additionally serial its time to the entry upon the procedures of receiving reply information comprise a chestnut are restoring procedure to receive information corresponding entry of the transmission buffer, the steps to output said detection, transmission claim transmission instruction time in the buffer is characterized that you and cormorants line detection reply information can not be received by periodically checking whether there is a predetermined time period prior to the request information from the current time step 9 The listed program. The transmission procedure to the web server, characterized in that detects that the communication procedure fails to connect with the destination web server when instructed to transmit the request information to the communication procedure including the steps of said detection The program according to claim 9. Before Kitoma stop information extraction transmission procedure, than the stop information data, taken out of the web server of the stop information was not the reply, turns on the stop flag of each window Ebusaba if time is long as it entered the stop period when at the time of its In the analysis procedure , when the request information from the web client is analyzed and the web server on which the requested information is located is determined, the stop flag is checked. a web server identification it is determined to suppress the transmission request to the server stops information extraction transmission procedure, sending pass source information, according to claim 9, wherein it to contain instructions on instructing transmission and confirmation of stop information Program. A program installed in a web server, according to an instruction or input information of the operator, adding stop information, update, and transmitting the instruction or content for deleting the upstream proxy server, the system-down of the device itself Upon receipt of the notification, the stop information in which the time information is embedded is generated and automatically transmitted to the proxy server. Upon successful restart of the own device, the presence / absence of automatic transmission of the stop information is checked. A program for causing a server computer to execute a stop information transmission procedure for transmitting a deletion instruction.

Images