JP5255006B2 - Web system, method and program - Google Patents

Description

  The present invention relates to a Web system, method, and program, and more specifically, a Web that can deliver the latest Web page in response to a request from a user terminal even when a failure occurs in a Web server that transmits the Web page. The present invention relates to a system, a method, and a program.

Due to the explosive spread of the Internet, various services such as portal sites and video posting sites have been provided. A site that provides such a large-scale service is used by many users, and once a failure occurs in the Web server, the service cannot be provided. Therefore, in a site that provides such a large-scale service, there are cases where a plurality of Web servers are made to correspond to one URL and have a redundant configuration for the purpose of load distribution and failure handling (see FIG. 9).
In this case, even when the Web server that has received the Web page request for the predetermined URL from the user terminal has failed, if the Web page request is made again for the predetermined URL from the user terminal, the configuration is redundant. Another Web server can respond to the request for the Web page. However, as described above, the user is forced to request the same Web page again (see FIG. 9 (1)).
Furthermore, it is not possible to cope with the case where all of the redundant server groups are stopped due to a power failure or a disaster (see FIG. 9 (1)).

On the other hand, techniques disclosed in Patent Literature 1 and Patent Literature 2 are known regarding service provision when a failure occurs in a Web server.
In Patent Document 1, a predetermined amount of content on the Internet is cached in advance in a user terminal so that the content can be browsed even in an offline state. However, a system capable of providing a service is disclosed.
Further, in Patent Document 2, in an automatic transaction apparatus installed in a financial institution or a convenience store, after a failure occurrence screen is displayed for a certain period of time when a Web page display failure occurs, the failure is restored by displaying an initial screen. A method is disclosed.

JP 2007-213173 A JP 2004-151861 A

  However, in the system disclosed in Patent Document 1, the service provided in a state incapable of communicating with the Web server is cached in advance in the user terminal, so there is no guarantee that it is the latest service.

In addition, in the method disclosed in Patent Document 2, an initial screen is displayed after the failure is recovered, so that the user is forced to perform the same operation again in order to provide the service that should have been provided when the failure occurred. It will be.
Here, in the service on the Internet, it is generally performed to provide a service specialized for a specific user based on information (login information, search keyword, etc.) input by the user on a Web page. Specifically, information that is most suitable for the logged-in user is provided, information that the user is interested in is estimated from a search keyword, and an advertisement related to the information is provided.
It is troublesome to force the user to input such information again at the time of failure of the Web server, and it is not desirable from the viewpoint of providing a continuous service on the Internet.

  The present invention has been made in view of such problems, and provides the latest service continuous with the service provided before the occurrence of a failure without requiring a user's additional operation in the event of a web server failure. An object is to provide a possible Web system, method and program.

The present invention provides the following solutions.
In the following, the expression “attribute information” is used, but “attribute information” refers to information (URL parameter) input by a user on a Web page such as login information or a search keyword, a link source Web page, and the like. The referrer shown. More specifically, it refers to information starting with a question mark “?” Added after a URL (Uniform Resource Locator).

(1) A user terminal and a W that transmits a Web page in response to a request from the user terminal
a redirect destination W that manages the same data as the Web server, the Web system being capable of transmitting a Web page even when the Web server is faulty
a web page requesting unit that includes an eb server, and wherein the user terminal transmits a web page request including a URL and attribute information to the web server corresponding to the URL;
A receiving unit that receives the Web page from a server, and a Web that stores the Web page request in the local storage area of the user terminal each time the Web page request is transmitted
When a response to the Web page request is not obtained from the Web server for a predetermined period or longer, a URL included in the Web page request stored in the Web page request storage unit is sent to the redirect destination Web server. U to change to the corresponding URL
When the response to the Web page request from the Web server is not obtained for a predetermined period or longer , the display frame of the Web page that has transmitted the Web page request to the Web server is divided into a main frame and a divided frame. And a redirect request unit that transmits a web page request including the URL changed by the URL changing procedure and the attribute information to the redirect destination web server using the divided frame as a transmission source.

According to the Web system of (1), when the user terminal cannot obtain a response from the Web server, the URL included in the Web page request stored in the local storage area of the user terminal is sent to the redirect destination Web server. The web page is requested after changing to the corresponding URL. Thereby, even when a failure occurs in the Web server, the redirect Web server that manages the same data can provide the latest Web page.
Further, the Web page request is transmitted to the redirect destination Web server in a state where the attribute information is added in addition to the changed URL. Therefore, for example, a continuous service can be provided without requiring the user to input again.

  (2) The Web system according to (1), wherein the reception unit further receives a predetermined program that causes the user terminal to function the Web page request storage unit, the URL change unit, and the redirect request unit.

  According to the Web system described in (2), the same effect as in (1) can be achieved by the program transmitted together with the Web page.

  (3) When the web page request stored in the web page request storage unit does not include attribute information, the redirect request unit transmits a web page request that does not include attribute information to the redirect destination web server. The Web system according to (1) or (2).

  According to the Web system of (3), when attribute information cannot be obtained, a Web page request not including attribute information can be transmitted to the redirect destination Web server.

(4) A method capable of delivering a web page in the event of a failure of a web server that sends a web page in response to a request from a user terminal, comprising a redirect destination web server that manages the same data as the web server, The user terminal is a W consisting of URL and attribute information.
sending an eb page request to the web server corresponding to the URL;
a step of receiving the web page from an eb server; a step of storing the web page request in a local storage area of the user terminal each time the web page request is transmitted; and a response to the web page request from the web server When the URL is not obtained for a predetermined period or longer, the URL included in the Web page request stored in the local storage area is changed to a URL corresponding to the redirect destination Web server, and the Web server responds to the Web page request. When a response is not obtained for a predetermined period or longer, the display frame of the Web page that has transmitted the Web page request to the Web server is divided into a main frame and a divided frame, and the changed URL is transmitted using the divided frame as a transmission source. Consisting of the attribute information Method comprising the steps of: transmitting a eb page request to the redirect destination Web server, the.

(5) User terminal and W that transmits a web page in response to a request from the user terminal
a Web system including an eb server, wherein a Web page request including a URL and attribute information is transmitted to the user terminal to the Web server corresponding to the URL
A page request procedure, a web page request storage procedure for storing the web page request in the local storage area of the user terminal each time a web page request comprising URL and attribute information is transmitted to the web server, and The We stored in the local storage area when a response to the Web page request is not obtained for a predetermined period or longer.
The URL change procedure for changing the URL included in the b page request to a URL corresponding to the redirect destination Web server that manages the same data as the Web server, and a response to the Web page request from the Web server is obtained for a predetermined period or more. If not, the display frame of the Web page that transmitted the Web page request to the Web server is divided into a main frame and a divided frame, and the URL changed by the URL changing procedure using the divided frame as a transmission source and the URL A redirect request procedure for transmitting a web page request comprising attribute information to the redirect destination web server.

  According to the method (4) and the program (5), the same effects as the Web system (1) can be obtained.

  According to the present invention, when a Web server fails, it is possible to provide the latest service that is continuous with the service provided before the failure occurs without requiring an additional operation by the user.

It is a figure which shows the outline | summary of 1st Embodiment of this invention. It is a figure which shows the structure of the Web system of 1st Embodiment of this invention. It is a figure which shows Web page request DB contained in the Web system of 1st Embodiment of this invention. It is a figure which shows the prescription | regulation content of the script program of 1st Embodiment of this invention. It is a flowchart which shows the flow of the process performed by a user terminal according to the script program of 1st Embodiment of this invention. It is a figure which shows the operation example of the Web system of 1st Embodiment of this invention. It is a figure which shows an example of the method for avoiding a cross domain restriction | limiting. It is a figure which shows the program provision method of another embodiment. It is a figure which shows the operation example at the time of the failure occurrence in the conventional Web system.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment described below is merely an example, and the technical scope of the present invention is not limited to this.

[Overview]
The outline of the first embodiment of the present invention will be described with reference to FIG.
In the first embodiment, a user terminal 10 and a web server 20 that transmits a web page in response to a request from the user terminal 10 (specifically, a web server group, but for ease of explanation, as a web server) The web server 1 manages the same data as the web server 20 when a failure occurs in the web server 20 and there is no response to the web page request from the user terminal 10 for a predetermined time or more. A Web page request is made to the redirect destination Web server 30 that functions as a backup of the server 20, and a response to the Web page request is received from the redirect destination Web server 30. At this time, the “attribute information (URL parameter, referrer, etc.)” included in the Web page request to the Web server 20 is also included in the Web page request to the redirect destination Web server 30. It is possible to provide the latest continuous service. And this 1st Embodiment is characterized by performing such control according to the script program previously transmitted to the user terminal 10 with the Web page transmitted from the Web server 20 before failure occurrence.
Hereinafter, it will be described in detail with reference to the drawings.

[Configuration of Web System 1]
A Web system 1 according to the first embodiment of the present invention will be described with reference to FIG.
The Web system 1 includes a user terminal 10, a Web server 20, and a redirect destination Web server 30. The user terminal 10 can communicate with the Web server 20 and the redirect destination Web server 30 via the network, and transmits a Web page request to the Web server 20 and the redirect destination Web server 30. The Web server 20 transmits a Web page and a script program in response to a request from the user terminal 10. The redirect destination Web server 30 manages the same data as the Web server 20, functions as a backup of the Web server 20, and transmits a Web page and a script program in response to a request from the user terminal 10.

  In addition, the user terminal 10 includes a Web page request unit 11, a Web page request storage unit 12, a Web page request database (hereinafter referred to as “DB”) 13, a response monitoring unit 14, and a Web page reception Means 15, Web page display means 16, URL changing means 17, and redirect request means 18 are provided.

  The web page request unit 11 makes a web page request to the web server 20. Here, the “Web page request” includes a URL and attribute information, is automatically configured by a user operation or not by a user operation, and is transmitted to the Web server 20.

The web page request storage unit 12 stores the web page request in the web page request DB 13 every time the web page request unit 11 transmits a web page request according to the script program received from the web server 20. Details of the script program will be described later with reference to FIG.
The Web page request DB 13 is provided in the local storage area of the user terminal 10 and sequentially stores Web page requests including URL and attribute information as shown in FIG.

  The response monitoring unit 14 monitors whether a response (Web page) to the Web page request is received within a predetermined time after the Web page request. If a response is not received within a predetermined time, it is determined that a timeout has occurred. The predetermined time can be arbitrarily set.

  The web page receiving unit 15 receives a web page and a script program from the web server 20 and the redirect destination web server 30. The details of the script program will be described with reference to FIG. 4, but the script program stipulates that the redirect source URL included in the Web page request is changed to the redirect destination URL when a timeout occurs. . For example, if a failure occurs in the Web server 20 in the script program and the Web page request (URL “http://abc.co.jp”) times out, the URL “http://abc2.co. jp "is specified.

  The web page display unit 16 displays the received web page on the display screen of the user terminal 10.

The URL changing unit 17 responds to the Web page request stored in the Web page request DB 13 together with the currently displayed Web page or according to a script program received before that when the response monitoring unit 14 determines that the timeout has occurred. The included URL is changed to a URL corresponding to the redirect destination Web server 30.
Specifically, the URL changing unit 17 compares the latest Web page request (determined as time-out) with the redirect source URL specified in the script program, and redirects to a matching part (forward match). Change to the destination URL. If the latest Web page request has attribute information, the attribute information is added to the redirect URL.

  The redirect request means 18 transmits a web page request based on the redirect destination URL and attribute information to the redirect destination web server 30 in accordance with the script program received before or with the currently displayed web page.

  As described above, in the first embodiment, when attribute information is included in the latest Web page request, the Web page request is transmitted to the redirect destination Web server 30 while retaining the attribute information. As a result, when the Web server 20 fails, it is possible to provide the latest service continuous with the service provided before the failure occurs without requiring an additional operation by the user.

Specifically, taking a search keyword as an example of attribute information as an example, when a search keyword is input and a Web page request (request associated with a search button operation) is made, attribute information indicating the search keyword is added to the URL in addition to the URL. It is transmitted to the server 20. At this time, if a failure has occurred in the Web server 20, a Web page request is transmitted to the redirect destination Web server 30. In this case, if the search keyword is not transmitted to the redirect destination Web server 30, the redirect destination Web server 30 cannot return the search result, and the search screen is displayed again on the user terminal 10. On the other hand, in the first embodiment, since the search keyword is also transmitted to the redirect destination Web server 30, the redirect destination Web server 30 can return the search result to the user terminal 10.
Therefore, in the first embodiment, the latest service that is continuous with the service provided before the occurrence of the failure can be provided without requiring an additional operation by the user.

[Configuration of Hardware and Software of First Embodiment]
The first embodiment is applied to a computer and its peripheral devices. Each means in the first embodiment is configured by hardware included in a computer and its peripheral devices, and software for controlling the hardware.

  The hardware includes a CPU as a control device (control unit), a storage device (storage unit), a communication device (communication unit), a display device (display unit), and an input device (input unit). Examples of the storage device (storage unit) include a memory (RAM, ROM, etc.), a hard disk drive (HDD), and an optical disk (CD, DVD, etc.) drive. Examples of the communication device (communication unit) include various wired and wireless interface devices. Examples of the display device (display unit) include various displays such as a liquid crystal display and a plasma display. Examples of the input device (input unit) include a keyboard and a pointing device (such as a mouse).

  The software includes a computer program and data for controlling the hardware. The computer program and data are stored in a storage device (storage unit), and are appropriately executed and referenced by a control device (control unit).

[Script Program Rules]
Next, contents defined by the script program according to the first embodiment will be described with reference to FIG.
The script program according to the first embodiment is defined by, for example, JavaScript (registered trademark), and is transmitted from the Web server 20 and the redirect destination Web server 30 together with a Web page (specifically, HTML: HyperText Markup Language). This script program causes the user terminal 10 to execute at least the following procedures (1) to (4).
(1) A procedure for storing a web page request in the local storage area (web page request DB 13) of the user terminal 10 each time a web page request is transmitted to the web server 20.
(2) A procedure for determining whether a web page has been received from the web server 20 before the time-out.
(3) When the Web page is not received by the time, the URL part of the latest Web page request stored in the local storage area is changed to the URL of the redirect destination Web server 30 (the attribute information is the latest Web page) Same as request) procedure.
(4) A procedure of transmitting the web page request changed in the procedure of (3) to the redirect destination web server 30.

  As will be described in detail later, it is preferable that the script program defines a program for avoiding security restrictions (cross-domain restrictions) when requesting data from different domains.

[Processing flow in user terminal 10]
Next, with reference to FIG. 5, the flow of processing performed in the user terminal 10 according to the script program will be described.

  When the Web page request unit 11 transmits a Web page request to the Web server 20 in S1, the Web page request storage unit 12 stores the Web page request in the local storage area of the user terminal 10 according to the script program. (S2). The script program is received from the Web server 20 together with or before the currently displayed Web page.

  Subsequently, the response monitoring unit 14 determines whether or not the Web page corresponding to the Web page request has been received by the time-out according to the script program (S3). At this time, if the web page has been received before the timeout, the control unit of the user terminal 10 cancels the timer according to the script program (S4), and the web page display means 16 displays the web page (S5). .

  On the other hand, if the web page has not been received before the timeout, the control unit of the user terminal 10 cancels the web page request to the web server 20 according to the script program (S11). Then, the URL changing unit 17 changes the URL of the Web page request to the redirect destination URL according to the script program (S12), and if the latest Web page request has attribute information, the URL changing unit 17 sets the attribute to the changed redirect destination URL. Information is added (S13).

  Subsequently, the redirect request means 18 transmits a web page request to the redirect destination web server 30 in accordance with the script program (S14). Thereafter, when the Web page receiving unit 15 receives a Web page from the redirect destination Web server 30 (S15), the Web page display unit 16 displays the Web page (S5).

[Operation in Web System 1]
Next, an operation flow in the Web system 1 will be described with reference to FIG.

  In FIG. 6 (1), the search page 100 transmitted from the Web server 20 is displayed on the user terminal 10. Note that a script program is also transmitted to the user terminal 10 together with or before the search page 100. The search page 100 is a Web page including a keyword input field 101 and a search button 102. When a search keyword is input to the keyword input field 101 and the search button 102 is operated, a search result is returned from the Web server 20. Is done.

6 (1), when “patent” is entered in the keyword input field 101 and the search button 102 is operated, the web server 20 will receive “http://abc.co.jp?p=patent&search.x”. = 1 & fr = top_ga1... And the web page request 110 is stored in the web page request DB 13 provided in the local storage area of the user terminal 10. Note that the storage in the local storage area is performed in accordance with a script program transmitted together with the search page or before.
In the Web page request 110, the part before the question mark “?” Is the URL, and the part after the question mark “?” Is the attribute information 111. The attribute information 111 of the Web page request 110 indicates that the search keyword is “patent”.

  Thereafter, when the search result is not returned from the Web server 20 for a predetermined time or longer, the user terminal 10 redirects the URL portion “http://abc.co.jp” of the Web page request 110 according to the script program. Change the URL to “http://abc2.co.jp”. Then, the attribute information 111 included in the latest Web page request 110 is added to the redirect destination URL to form a Web page request 120, and the Web page request 120 is transmitted to the redirect destination Web server 30 ((2) in FIG. 6). ).

  The redirect destination Web server 30 returns a Web page corresponding to the Web page request 120 to the user terminal 10. Here, since the Web page request 120 includes the attribute information 111 indicating the search keyword, the redirect destination Web server 30 can return the search result, and the search result page 130 is displayed on the user terminal 10. (FIG. 6 (3)).

  Thus, in the Web system 1 according to the present invention, when a failure occurs in the Web server 20, a Web page request is made to the redirect destination Web server 30 while retaining the attribute information included in the latest Web page request. . Therefore, when the Web server 20 fails, it is possible to provide the latest service continuous with the service provided before the failure occurs without requiring an additional operation by the user.

[Avoid cross-domain restrictions]
Here, in the present invention, when the Web server 20 fails, the Web page is received from the redirect destination Web server 30 having a URL (domain) different from that of the Web server 20. In providing services on the Internet, there are cases where restrictions are imposed on data requests (so-called cross domains) from different domains due to security reasons. In the first embodiment, such a restriction is avoided according to the script program transmitted from the Web server 20 together with the Web page. A method for avoiding such cross-domain restriction will be described with reference to FIG.

  FIG. 7 is a flowchart showing a flow of processing executed on the user terminal 10 in accordance with the script program. FIG. 7 shows a method of receiving a Web page from the redirect destination Web server 30 while avoiding the cross domain restriction, and performs the processes of S14A to S16A in addition to the flowchart of FIG. Hereinafter, a method for receiving a web page from the redirect destination web server 30 while avoiding the cross-domain restriction will be described with reference to processing (S11 to S16A) when a web page request to the web server 20 times out. .

  In S11, when the Web page has not been received before the time-out, the control unit of the user terminal 10 cancels the Web page request to the Web server 20 according to the script program. Then, the URL changing unit 17 changes the URL of the Web page request to the redirect destination URL according to the script program (S12), and if the latest Web page request has attribute information, the URL changing unit 17 sets the attribute to the changed redirect destination URL. Information is added (S13). The process up to this point is the same as the flowchart of FIG.

  In the subsequent process in which the redirect request unit 18 transmits a web page request to the redirect destination web server 30, the redirect request unit 18 uses the frame to send the web page to the redirect destination web server 30 in order to avoid cross domain restrictions. Make a request. Specifically, the Web page is divided into frames, and a Web page of a different domain (redirect destination Web server 30) is requested to the frame divided from the frame of the main screen.

  Thereafter, the Web page from the redirect destination Web server 30 is received in a divided frame (S15A), and the Web page received in the divided frame is transmitted as it is to the main screen frame (by postMessage) (S16). The Web page is displayed on the main screen (S5).

  Here, the frame can be dynamically created when necessary, and the frame portion may be hidden. By hiding the frame portion, even when the Web server 20 is switched to the redirect destination Web server 30, continuity in display can be obtained, which is preferable.

  The example of the method for avoiding the cross domain restriction has been described above with reference to FIG. 7. However, the method of FIG. 7 is only an example, and the cross domain restriction may be avoided by another method. For example, in HTML / XHTML, the URL of the other party to be called is specified in the src attribute of the script tag, and the processing result returned in the JSON (Java Script (registered trademark) Object Notification) format is function-evaluated. It is good also as using JSONP (JSON with padding) which obtains a processing result. Since the URL of a domain different from that of the caller can be specified in the src attribute of the script tag, it is possible to send a request by JSON to a different domain and directly call a function provided in another domain. .

  The avoidance of the cross domain restriction is executed according to a script program transmitted from the Web server 20 together with the Web page.

[Second Embodiment]
In the first embodiment, description has been made using JavaScript (registered trademark) transmitted with a Web page (HTML) as an example of a program for executing various procedures. However, the program is a program transmitted with a Web page. It is not limited to. Hereinafter, another embodiment of a program for executing various procedures will be described. Note that the configuration of the Web system 1 and the flow of processing are basically the same as those in the first embodiment, and a description thereof will be omitted.

  With reference to FIG. 8 (1), the script program of the first embodiment is characterized in that it is transmitted together with a Web page in response to a Web page request from the user terminal 10. On the other hand, as shown in FIG. 8B, the program of the second embodiment is a program distributed by a service provider who performs a redirect service and installed in the user terminal 10 in advance.

  The program of the second embodiment stores in advance the redirect destination of the service provided by the service provider, and also stores the redirect destination in FIG. 4, FIG. 5, and FIG. 7 of the first embodiment for the user terminal 10 (Web browser). It is conceivable that a program for executing the various procedures described is defined and provided as one function of a toolbar installed in the Web browser of the user terminal 10, for example.

  Although the program of the second embodiment has to be installed in the user terminal 10 in advance, it is not necessary to sequentially define the web page managed by the service provider, and the user can use the program in combination with other functions of the toolbar. However, it is preferable in that a finer service can be provided.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. In addition, the effects described in the embodiments of the present invention only list the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments.

  For example, in the embodiment of the present invention, a search keyword is used as an example of “attribute information”. However, as described above, “attribute information” is not limited to a search keyword. The “attribute information” includes information (URL parameter) input by the user on a Web page such as login information and a search keyword, and a referrer indicating a Web page that is a link source, and a question mark added after the URL. Information starting with “?”.

DESCRIPTION OF SYMBOLS 1 Web system 10 User terminal 11 Web page request means 12 Web page request storage means 13 Web page request DB
14 Response monitoring means 15 Web page receiving means 16 Web page display means 17 URL changing means 18 Redirect request means 20 Web server 30 Redirect destination Web server

Claims (5)

A web system that includes a user terminal and a web server that transmits a web page in response to a request from the user terminal, and is capable of transmitting a web page even when the web server is faulty.
A redirect destination web server that manages the same data as the web server;
Web page requesting means for transmitting a Web page request comprising the URL and attribute information to the Web server corresponding to the URL, by the user terminal;
Receiving means for receiving the web page from the web server;
Web page request storage means for storing the Web page request in a local storage area of the user terminal each time the Web page request is transmitted;
When a response to the Web page request cannot be obtained from the Web server for a predetermined period or longer, the URL included in the Web page request stored in the Web page request storage unit is changed to a URL corresponding to the redirect destination Web server. URL changing means;
When a response to the web page request is not obtained from the web server for a predetermined period or longer , the display frame of the web page that transmitted the web page request to the web server is divided into a main frame and a divided frame, A redirect request unit that transmits a web page request including the URL changed by the URL changing unit and the attribute information to the redirect destination web server as a transmission source;
A web system comprising:   The Web system according to claim 1, wherein the receiving unit further receives a predetermined program that causes the user terminal to function the Web page request storage unit, the URL changing unit, and the redirect request unit.   2. The redirect request unit, when attribute information is not included in a Web page request stored in the Web page request storage unit, transmits a Web page request that does not include attribute information to the redirect destination Web server. Alternatively, the Web system according to claim 2. A method capable of delivering a web page in the event of a failure of a web server that sends a web page in response to a request from a user terminal,
A redirect destination web server that manages the same data as the web server;
The user terminal is
Transmitting a web page request comprising a URL and attribute information to the web server corresponding to the URL;
Receiving the web page from the web server;
Storing the web page request in a local storage area of the user terminal each time the web page request is transmitted;
Changing a URL included in the Web page request stored in the local storage area to a URL corresponding to the redirect destination Web server when a response to the Web page request is not obtained for a predetermined period or longer from the Web server; ,
When a response to the web page request is not obtained from the web server for a predetermined period or longer , the display frame of the web page that transmitted the web page request to the web server is divided into a main frame and a divided frame, Transmitting, as a transmission source, a Web page request including the changed URL and the attribute information to the redirect destination Web server;
Including methods. In a Web system comprising a user terminal and a Web server that transmits a Web page in response to a request from the user terminal, the user terminal
A Web page request procedure for transmitting a Web page request comprising a URL and attribute information to the Web server corresponding to the URL;
A web page request storage procedure for storing the web page request in the local storage area of the user terminal each time a web page request comprising a URL and attribute information is transmitted to the web server;
When a response to the web page request is not obtained from the web server for a predetermined period or longer, the URL included in the web page request stored in the local storage area is the redirect destination web that manages the same data as the web server URL change procedure for changing to a URL corresponding to the server;
When a response to the web page request is not obtained from the web server for a predetermined period or longer , the display frame of the web page that transmitted the web page request to the web server is divided into a main frame and a divided frame, A redirect request procedure for transmitting a web page request composed of the URL changed by the URL change procedure and the attribute information to the redirect destination web server as a transmission source;
A program for running

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