JP2002024191A - Www system, traffic relief method for www server and www server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a WWW system, a traffic relief method for WWW server and a WWW server for utilizing the hardware resources effectively to attain a highly effective operation of a system where the WWW server decides dynamically a proxy server that holds the data requested by a client and thereby a fast access of large traffic variance is requested for the WWW server. SOLUTION: When an access request is given from a client 11 in a state where a WWW server 12 has large traffic, the server 12 refers to an access list 12A in response to a URL that received the access request from the client 11 and checks whether a proxy server 13 that accessed the same URL before exists or not. When the relevant server 13 exists, the IP address and port number of the server 13 are returned to the client 11 having the access request.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a WWW (World Wi-Fi).
de Web) The present invention relates to a WWW system including a server, a client, and a proxy server, a method for mitigating traffic of a WWW server, and a WWW server.

[0002]

2. Description of the Related Art In a WWW system having a WWW server, a client, and a proxy server, a plurality of client-side proxy servers are prepared, and a hash value is calculated for a client access request.
There is a method of using caches of a plurality of proxy servers by holding data for a client request in a cache of a client-side proxy server corresponding to a hash value.

However, in the above method, it is necessary to set in advance a plurality of client-side proxy servers to cooperate. Therefore, in the above-described conventional method, it is difficult to dynamically increase or decrease the number of client-side proxy servers, and there is a problem in achieving efficient system operation by effectively utilizing hardware resources. In particular, in a system that requires high-speed access where the traffic fluctuation of the WWW server is large, it is necessary to construct a system in consideration of the maximum traffic, and there is a problem in terms of economy.

[0004]

As described above, the WW
Conventionally, in a WWW system having a W server, a client, and a proxy server, it is difficult to dynamically increase or decrease the number of client side proxy servers. There is a problem in achieving good system operation. Particularly, in a system that requires high-speed access where the traffic fluctuation of the WWW server is large, it is necessary to construct a system considering the maximum traffic. There was a problem.

[0005] The present invention has been made in view of the above circumstances,
In a WWW system having a WWW server, a client, and a proxy server, there is no need to determine and set in advance a proxy server that wants to use a cache, and a proxy server holding data requested by a client. Can be dynamically determined by the WWW server, and in a system that requires high-speed access where the traffic fluctuation of the WWW server is large, efficient system operation utilizing hardware resources can be achieved.
An object of the present invention is to provide a W system and a method for mitigating traffic of a WWW server.

Further, according to the present invention, in the above-mentioned system, a W which can easily construct an efficient system for effectively distributing the load by effectively utilizing the cache of the proxy server.
It is intended to provide a WW server.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a mechanism is provided in a WWW server for dynamically determining a proxy server holding data requested by a client when there is a large amount of traffic. By introducing a proxy server holding data requested by a client, the cache of the proxy server is effectively used to realize load distribution.

That is, according to the present invention, WWW
In a WWW system having a server, a client, and a plurality of proxy servers, the WWW server includes:
Each time an access is made from the proxy server, an access list that holds the IP address and port number of the proxy server in association with the URL for which the access request is made, and an access request is received from the client in a state of heavy traffic Means for referencing the access list and introducing an access destination proxy server to a client who has made an access request.

Further, the present invention provides a WWW system comprising a WWW server, a client, and a plurality of proxy servers, wherein when the WWW server is accessed from the proxy server, a UR associated with the access is provided.
Means for obtaining the IP address and port number of the access source proxy server, and the obtained URL and IP
An access list that holds an address and a port number in association with each other, and one proxy that has recently received the same access request by referring to the access list when a client makes an access request in a state of heavy traffic Means for searching for a server and introducing the proxy server to the requesting client, wherein the client has means for requesting data from the proxy server when the proxy server is introduced from the WWW server. Features.

According to the present invention, in a method for mitigating traffic of a server, each time an access request from the proxy server is made, the IP address and port number of the proxy server and the access to the server to which the client and the proxy server are connected to the network are provided. Holding means for storing the requested URL in association with the requested URL, and when an access request is received from a client in a state of heavy traffic, access is made to the requested client by referring to the stored contents of the holding means The present invention is characterized in that a proxy server is introduced and traffic is reduced by effectively using a cache of the proxy server.

The present invention also provides a method for mitigating traffic of a WWW server, wherein the WWW server receives an IP request from the proxy server every time an access request is made from the proxy server.
Address and port number and URL where access was requested
And an access list that holds the information in association with
When the server receives an access request from a client in a state of high traffic, the server refers to the access list and introduces a proxy server having a cache of the access requested information to the client.

Further, according to the present invention, in a WWW server to which a client and a proxy server are connected, each time the proxy server accesses,
P address and port number and UR for which access was requested
Means for referencing an access destination proxy server to a client that has made an access request by referring to the access list when an access request is received from the client in a state where there is a large amount of traffic; And characterized in that:

As described above, the WWW server is provided with a mechanism for dynamically determining the proxy server holding the data requested by the client when there is a large amount of traffic, and the client requests the access request from the client. By realizing the function of introducing a proxy server holding data to be processed, efficient load distribution can be achieved by effectively using the cache of the proxy server.

Specifically, when the traffic of the WWW server is heavy, the cache of the proxy server which has made a similar access request before is used to respond to the request of the client, so that the traffic of the WWW server is heavy. Even if the response of the WWW server becomes slower, the response time to the client can be reduced, and the system throughput can be improved.

[0015] Further, when an access request is made from the client to the WWW server in a state where there is a large amount of traffic, when a plurality of proxy servers that have recently received the same access request are searched, the plurality of proxy servers are requested. Means for introducing to the original client, means for determining, when the client introduces a plurality of proxy servers from the WWW server, a proxy server which makes a data request by referring to the cache contents of each proxy server Is provided, it is possible to search for a proxy server that reliably holds data requested by a client in a cache.

Further, by providing the client with a means for acquiring data from the proxy server which has the fastest response when making an inquiry to a plurality of proxy servers introduced by the WWW server, the data requested by the client can be transmitted at a high speed. Can be obtained.

Further, when the proxy server receives a request for referring to data in the cache from the client,
Means for notifying the client of information to the effect that the data requested by the client does not exist in the cache, and means for notifying the client to the WWW server that the data does not exist in the cache of the proxy server. Means for deleting the proxy server from the access list when the WWW server receives information indicating that data is not present in the cache of the proxy server from the client, and the same access request as before when receiving the request from the client Means for retrieving one or more proxy servers from the access list, and notifying the requesting client of the retrieved proxy server information, so that the data requested by the client does not exist in the cache. From the access list By removed by, it can be solved the problem that would return the information of the proxy server does not hold the data in the cache to the client.

Also, the proxy server is provided with means for notifying the client of a request for referring to data in the cache when the client receives a request for referring to data in the cache when the load is high. A means for notifying the state to the WWW server when it recognizes that the price is high, and requesting introduction of another proxy server, and the WWW server receiving the same access request before receiving the request from the client One or more proxy servers other than the proxy server among the proxy servers are searched from the access list, and a means for introducing the searched proxy server to the requesting client is provided, so that the data requested by the client is stored in the cache. If another proxy server has a heavy load, Available.

Also, means for holding information on the proxy server, which holds the data previously received from the WWW server in the cache in the client, and when the access request is made, the access request for the URL has been made before. Means for receiving data from the cache of the corresponding proxy server by referring to the information of the stored proxy server when the proxy server holds the data requested by the client in the cache. The number of times of exchanging information can be reduced to reduce the load on the WWW server.

[0020] Further, there is provided means for notifying the client of a list of proxy servers that can be referred to from the cache to the WWW server when requesting data. Is a proxy server that has already existed, and has a means for searching the access list for one or more proxy servers that have received the same access request previously, and for notifying the requesting client of the searched proxy server information. Therefore, the reliability of the proxy server that acquires the data requested by the client from the cache can be improved.

In a system configuration in which a client accesses a reverse proxy server, the reverse proxy server is provided with a proxy server introduction function equivalent to a WWW server, so that a WWW system constituted by a normal WWW server is used. In addition, the proxy server introduction function of the present invention can be easily applied.

Further, in a system configuration in which a client-side proxy server is provided between a client and a WWW server, the client-side proxy server is provided with an access function equivalent to that of a client, so that it is configured by a normal client. The proxy server introduction function of the present invention can be easily applied to a WWW system.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the overall configuration of a WWW system according to an embodiment of the present invention.

In the figure, reference numerals 11 to 13 denote constituent elements of a WWW system provided on the network (L), 11 denotes a client, 12 denotes a WWW server, and 13 denotes a proxy server. Although there are a plurality of proxy servers 13 on the network (L), only one proxy server is shown here for convenience of explanation.

Reference numeral 12A denotes an access list provided in the WWW server 12. When an access request is made to the WWW server 12 from the proxy server 13, the URL and the I / O of the proxy server are controlled under the control of the WWW server 12.
The P address and the port number of the proxy server are stored in association with each other.

The WWW server 12 has access list writing means for recording the access request URL from the proxy server 13, the IP address of the proxy server, and the port number in the access list 12 A in association with each other. An access list writing unit that refers to the list 12A, a traffic abnormality detection unit that detects that the traffic of the WWW server 12 is heavy (traffic exceeds a specified value), and an access request from the client 11 in a state of heavy traffic. At this time, it is checked from the access list 12A whether or not there is a proxy server that has previously made the same access request.
If there is, a notifying means for returning information of the proxy server to the client 11 (introducing the corresponding proxy server to the client 11) is provided.

The client 11 uses the IP address and the port number of the proxy server returned from the WWW server 12 to acquire data from the cache of the proxy server 13 (11A).
Is provided.

FIG. 2 is a diagram showing the structure of the access list 12A provided in the WWW server 12. The URL 21, the IP address 22 of the proxy server, and the port number 23 of the proxy server, for which an access request has been made from the proxy server 13, are shown. Each is stored in association with each other.

FIGS. 3 and 4 are explanatory diagrams showing the flow of messages and data exchanged between the client 11, the WWW server 12, and the proxy server 13 in the above embodiment.

FIG. 5 is a flowchart showing a main part processing procedure of the WWW server 12 in the above embodiment.

The operation of the first embodiment of the present invention will now be described with reference to the above-mentioned drawings.

The WWW server 12 is the WWW server 1
2 in a normal state where the traffic is not large (the traffic is equal to or less than a specified value) (see step S1 (YE in FIG. 5)).
S)), when there is an access request from the proxy server 13, a response is returned to the proxy server 13 in the following procedure.

The WWW server 12 is a proxy server 13
URL for which access was requested from the proxy server 13
Of the proxy server 13 and the port number of the proxy server 13 (step S2 in FIG. 5).
The IP address and the port number are stored in the access list 12A shown in FIG. 2 in association with each other (step S3 in FIG. 5). Then, the data requested by the proxy server 13 is returned to the proxy server 13 (step S5 in FIG. 5).
4).

When the WWW server 12 receives an access request from the client 11 under the above traffic conditions (see reference numeral A1 in FIG. 3), the WWW server 12 returns the requested data to the requesting client 11 (reference numeral in FIG. 3). A2).

The WWW server 12 is in an abnormal state when the traffic of the WWW server 12 is large (traffic exceeds a specified value) (step S1 (N in FIG. 5)).
O)), when there is an access request from the client 11 (see reference numeral B1 in FIG. 4), U
By referring to the access list 12A based on the RL, it is checked whether or not the proxy server 13 has accessed the same URL before (step S5 in FIG. 5).
When there is a proxy server 13 that has accessed L, the IP address and port number of the proxy server are returned to the client 11 that has made the access request (step S6 in FIG. 5). In this embodiment, information of the proxy server 13 is returned to the client 11 (see reference numeral B2 in FIG. 4).

The client 11 sends information of the proxy server 13 from the WWW server 12 (the proxy server 13).
Receiving the IP address and port number of the proxy server 13, the proxy server 13 accesses the proxy server 13 according to the information and requests data from the proxy server 13 (reference B in FIG. 4).
3).

The proxy server 13 is connected to the client 1
In response to the request from the client 1, the corresponding data existing in the cache of the proxy server 13 is returned to the client 11 (see reference numeral B4 in FIG. 4).

As described above, according to the first embodiment of the present invention, the WWW server is provided with a mechanism for dynamically determining the proxy server holding the data requested by the client when the traffic becomes heavy. And a function of introducing a proxy server holding data requested by the client in response to an access request of the client, thereby enabling efficient load distribution by effectively using a cache of the proxy server. .

Specifically, when the traffic of the WWW server 12 becomes large, the cache of the proxy server 13 which has previously made the same access request is used,
By responding to the request from the client 11, the response time to the client 11 can be shortened even if the response of the WWW server becomes slow in a state where the traffic of the WWW server 12 is heavy, and the system throughput can be improved.

The reliability and efficiency can be further improved by adding the following functions to the functions of the first embodiment. Hereinafter, each embodiment will be described.

As a second embodiment, the WWW server 12 sends the client 1
When a plurality of proxy servers (13,...) That have recently received the same access request are searched for when an access request is made from one, the plurality of proxy servers (13,...) Are introduced to the requesting client 11. Means to
When a plurality of proxy servers (13,...) Are introduced from the WWW server 12 to the client 11, one proxy server making a data request by referring to the cache contents of each proxy server (13,...) Is determined. According to this embodiment,
The data can be obtained by searching the proxy server 13 which reliably holds the data requested by the client 11 in the cache.

As a third embodiment, the other second
In addition to the functions of the first embodiment, the client 11
A plurality of proxy servers (1
When an inquiry is made to (3,...), A means is provided for acquiring data from the proxy server 13 which has the fastest response. According to this embodiment, client 1
1 can be obtained from the proxy server 13 at higher speed.

As a fourth embodiment, when the proxy server 13 receives a request from the client 11 to refer to data in the cache, and when the data requested by the client 11 does not exist in the cache, the proxy server 13 informs the user. Means for notifying the client 11 of information, and the WWW server 1 notifying the client 11 that no data exists in the cache of the proxy server 13.
2 and a means for notifying WWW server 12
Means for deleting the proxy server 13 from the access list upon receiving information indicating that no data exists in the cache of the proxy server 13 from the client 11; Means for retrieving one or more proxy servers (13,...) From the access list, and notifying the requesting client 11 of information of the retrieved proxy servers (13,...). .
According to this embodiment, by deleting the proxy server 13 whose data requested by the client 11 does not exist in the cache from the access list, the information of the proxy server whose data is not stored in the cache is returned to the client. Can be resolved.

As a fifth embodiment, when the proxy server 13 receives a request for referring to data in the cache from the client 11 when the load is high, the proxy server 13 notifies the client 11 of the load status. And the client 11 has a proxy server 1
3 is provided with means for notifying the state to the WWW server 12 when it recognizes that the load is high, and requesting the introduction of another proxy server. Among the proxy servers that have previously received the same access request, one or more proxy servers other than the proxy server with the higher load are searched from the access list, and information of the searched proxy server is introduced to the requesting client 11 ( Notification) means. According to this embodiment, when the load on the proxy server holding the data requested by the client 11 in the cache is high, another proxy server with a low load can be accessed to acquire the data.

As a sixth embodiment, the client 11 has means for holding information on the proxy server 13 that holds data previously received from the WWW server 12 in a cache.
Means for receiving data from the cache of the proxy server 13 by referring to the information of the proxy server 13 from the holding means when an access request to L has been made before. According to this embodiment, the number of times of exchanging information on the proxy server that holds the data requested by the client 11 in the cache can be reduced, and the load on the WWW server 12 can be reduced.

As a seventh embodiment, a means for notifying the client 11 of a list of the proxy servers 13 that can be referred to from the cache to the WWW server 12 when requesting data is provided. A proxy server that exists and is also present in the list of proxy servers received from the client, searches one or more proxy servers that have previously received the same access request from the access list, and searches for the searched proxy server ( 13,...) To the requesting client. According to this embodiment, the reliability of the proxy server 13 that acquires the data requested by the client 11 from the cache can be improved.

As an eighth embodiment, in a system configuration in which the access target of the client 11 includes a reverse proxy server (referred to as 14), a proxy server introduction (notification) equivalent to the WWW server 12 is provided to the reverse proxy server 14. With the function, the proxy server introduction (notification) function of the present invention can be easily applied to a WWW system including a normal WWW server.

As a ninth embodiment, in a system configuration in which a client-side proxy server (referred to as 15) is provided between the client 11 and the WWW server 12, the client-side proxy server 15 has the same configuration as the client 11. , The proxy server introduction (notification) function of the present invention can be easily applied to a WWW system composed of ordinary clients.

As a tenth embodiment, a client-side proxy server (referred to as 15) and a server-side proxy server (referred to as 16) are provided between the client 11 and the WWW server 12, and the client-side proxy server 15 is provided. Has the same access function as the client 11, and the server-side proxy server 16 has the WWW server 12
By providing a server introduction (notification) function equivalent to the above, the proxy server introduction (notification) function of the present invention can be easily applied to a WWW system composed of ordinary clients and servers.

[0051]

As described above in detail, according to the present invention, W
In a WWW system having a WWW server, a client, and a proxy server, there is no need to determine and set in advance a proxy server that wants to use a cache, and a proxy server holding data requested by a client. Can be dynamically determined by the WWW server, so that efficient system operation can be achieved by effectively utilizing hardware resources in a system that requires high-speed access where the traffic fluctuation of the WWW server is large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a WWW system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of an access list provided in a WWW server in the embodiment.

FIG. 3 shows a client and WWW in the embodiment.
FIG. 4 is an operation explanatory diagram showing a flow of messages and data exchanged between a server and a proxy server.

FIG. 4 shows a client and WWW in the embodiment.
FIG. 4 is an operation explanatory diagram showing a flow of messages and data exchanged between a server and a proxy server.

FIG. 5 is a flowchart showing a main part processing procedure of the WWW server in the embodiment.

[Explanation of symbols]

 11 Client 12 WWW Server 12A Access List 13 Proxy Server L Network

Claims (14)

[Claims] In a WWW system comprising a WWW server, a client and a plurality of proxy servers on a network, each time the WWW server is accessed from the proxy server, an IP address of the proxy server and When an access request is received from the client in a state where there is a large amount of traffic, the access list that holds the port number and the URL that has made the access request in association with each other is referred to, and the client that made the access request is referred to A WWW system comprising means for introducing an access destination proxy server. 2. In a WWW system comprising a WWW server, a client, and a plurality of proxy servers, when the WWW server is accessed from the proxy server, a URL associated with the access and an access source proxy server Means for obtaining the IP address and port number of the client; an access list for holding the obtained URL and the IP address and port number in association with each other; Means for referring to the access list, searching for one proxy server that has recently made the same access request, and introducing the proxy server to the requesting client, wherein the client introduces a proxy server from the WWW server. When
A WWW system comprising means for requesting data from the proxy server, and effectively utilizing the cache of the proxy server when the traffic of the WWW server is large. 3. When a plurality of proxy servers that have recently received the same access request are searched for when the client requests access to the WWW server in a state where the traffic is heavy, the plurality of proxy servers are requested. Means for introducing to the original client, and when the client introduces a plurality of proxy servers from the WWW server, the proxy server which makes a data request is determined by referring to the cache contents of each proxy server 3. The WWW system according to claim 2, comprising means. 4. When a plurality of proxy servers that have recently received the same access request are searched for when the client makes an access request to the WWW server with a large amount of traffic, the plurality of proxy servers are requested. A means for introducing to the original client, wherein when the client introduces a plurality of proxy servers from the WWW server, the client makes an inquiry to the introduced plurality of proxy servers, and a proxy server which has the fastest response 3. The WW according to claim 2, further comprising: means for acquiring data from the WW.
W system. 5. When the proxy server receives a request for referring to data in a cache from the client, and when the data requested by the client does not exist in the cache, the proxy server notifies the client of the information to that effect. Means for notifying the client that there is no data in the cache of the proxy server to the WWW server; and transmitting the data from the client to the cache of the proxy server from the client to the WWW server. Means for deleting the proxy server from the access list when receiving information indicating that the server does not exist, and when receiving the request from the client, one or more proxy servers which have previously received the same access request. The proxy server searched from the access list and searched 3. The WWW system according to claim 2, further comprising means for notifying the requesting client of the information of the server. 6. When the proxy server receives a request to refer to data in a cache from the client when the load is high, the proxy server has means for notifying the client of the request. When recognizing that the load on the proxy server is high,
Means for notifying the WWW server of the state and requesting introduction of another proxy server, and when the WWW server receives a request from the client, the proxy server which has previously received the same access request 3. The WWW system according to claim 2, further comprising means for searching for one or more proxy servers other than the proxy server from the access list, and introducing the searched proxy server to a requesting client. 7. A means for holding information on a proxy server that holds data previously received from a WWW server in a cache to the client, and an access request to the URL has been previously made at the time of the access request. 3. The WWW system according to claim 2, further comprising: means for referring to the information on the proxy server held in the holding means and receiving data from a cache of the corresponding proxy server. 8. When the client requests data from the client, the client includes a means for notifying the WWW server of a list of proxy servers that can be referred to from a cache. A proxy server that is also present in the list of proxy servers received from
3. The WWW system according to claim 2, further comprising means for searching for one or a plurality of proxy servers from the access list, and notifying a requesting client of information of the searched proxy server. 9. The client according to claim 2, wherein a reverse proxy server is included in an access target of the client, and the reverse proxy server has a proxy server introduction function equivalent to that of the WWW server. WWW system. 10. A client-side proxy server between the client and the WWW server, wherein the client-side proxy server has an access function equivalent to that of the client. The WWW system according to 5 or 6 or 7 or 8. 11. A client-side proxy server and a server-side proxy server between the client and the WWW server, wherein the client-side proxy server has an access function equivalent to the client.
The WWW system according to claim 2, wherein the server-side proxy server has a proxy server introduction function equivalent to the WWW server. 12. A server to which a client and a proxy server are connected on a network holds an IP address and a port number of the proxy server and a URL for which the access request is made in association with each access request from the proxy server. When the access request is received from the client in a state where there is a lot of traffic,
Refer to the holding contents of the holding means to introduce the access destination proxy server to the client that has requested access,
A server traffic mitigation method, wherein the proxy server cache is effectively used to reduce traffic. 13. A WWW having a WWW server, a client, and a plurality of proxy servers on a network.
In the system, the WWW server is provided with an access list for holding the IP address and port number of the proxy server in association with the URL requested for access each time an access request is made from the proxy server, When the server receives an access request from the client in a state of high traffic, the server refers to the access list,
W is characterized in that a proxy server having a cache of the information requested for access is introduced to a client.
WW server traffic mitigation method. 14. In a WWW server to which a client and a proxy server are connected, each time an access is made from the proxy server, the IP address and port number of the proxy server are associated with the URL requested for access and held. An access list, and means for referring to the access list when an access request is received from the client in a state where there is a large amount of traffic and introducing an access destination proxy server to the client that has made the access request, A WWW server characterized by effectively utilizing a proxy server cache to reduce traffic.