JP2002073401A - WWW content distribution system, proxy server device, WWW server device, WWW content distribution method, and computer-readable recording medium recording program for causing computer to execute the method - Google Patents

Abstract

(57) [Summary] [Problem] WWW for reducing useless traffic for update check between WWW server and proxy server
Obtaining a content distribution system. SOLUTION: A WWW server 10 is a proxy server 20
Notifies the WWW content update to the proxy server 2
0 updates the cache using the update notification as a trigger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for providing a desired WWW (World Wide) on the Internet.
Web) WWW content distribution system, server device, proxy server device, WWW content distribution method and WWW content distribution method capable of always acquiring latest WWW content when acquiring content via proxy server device The present invention relates to a computer-readable recording medium on which a program to be executed is recorded.

[0002]

2. Description of the Related Art Normally, a LAN (L) such as an in-house network is used.
ocal Area Network), in order to secure data confidentiality,
In many cases, a proxy service has been introduced to provide in-house clients with Internet access. When a proxy server located in the company network receives an access request from a company client, the proxy service interprets the request and accesses the target server on the Internet, receives the result, and passes it to the company client. It is a mechanism.

[0003] With this mechanism, only the proxy server can be seen from the Internet, and the in-house machine cannot be seen at all. On the other hand, the company client communicates directly with only the proxy server, and does not directly communicate with the server on the Internet. As a result, the confidentiality of data to the outside in the in-house LAN is achieved.

[0004] The proxy server caches recently accessed data on a disk, and when an in-house client requests access to the WWW content at the same address again, the cached WWW is cached.
The response speed is improved by returning the contents.

However, in the cache function described above,
There is a problem that it is not possible to know that the WWW content has been updated on the WWW server, and it is not possible to obtain the latest WWW content. Therefore, there has been proposed a system that can distribute the latest WWW content as much as possible to in-house clients while taking advantage of the cache function of the proxy server.

For example, according to “Information acquisition terminal, information cache server, and information acquisition method” disclosed in Japanese Patent Application Laid-Open No. H11-15714, the proxy server communicates with the WWW server corresponding to each predetermined time set by the timer. An inquiry as to whether or not the data of the WWW content has been updated is transmitted. If the response is that the data has been updated, then the data in the cache disk is replaced with the updated WWW content.

FIG. 3 is a system block diagram of the "information acquisition terminal, information cache server and information acquisition method". As shown in FIG. 3, this system includes an information acquisition client terminal 130 and a WWW proxy server 120 and a WWW server 110 connected to each other via the Internet 109. Also, WWW
The proxy server 120 includes a communication control unit 122 and WWW
Proxy processing means 125 and cache disk 128
And

[0008] The WWW proxy server 120 represents the WWW server 11 on behalf of each information acquisition client terminal 130.
Predetermined data is updated and held from 0, and data distribution is performed in response to a data request of each information acquisition client terminal 130. Here, the WWW proxy server 120
Knows in advance the data range requested by each information acquisition client terminal 130 and manages it.

In this system, for an address that is accessed regularly, for example, every day, the WWW proxy server 120 acquires data of the information providing server during a time period when traffic is low, such as at night, and stores it in the cache disk of the information cache server. Can be kept. As a result, daytime traffic during which access is concentrated can be reduced, and the response of the information acquisition client terminal 130 can be improved (reduction in response time), communication costs can be reduced, and the like.

As another example, Japanese Patent Application Laid-Open No. 11-232 / 1999
According to the “reservation-type information search distribution method and system” disclosed in Japanese Patent Publication No. 302, a reservation search request from a client terminal is received and specified information is collected from each WWW server connected to the Internet at regular time intervals. A search server (function equivalent to a proxy server) is provided. Thereby, when trying to search and collect information from a WWW server connected to the Internet, if it is a WWW server to be constantly searched and collected without urgency, it is possible to register a reservation search in advance. The latest information can be automatically collected at a certain time.

As another example, Japanese Patent Application Laid-Open No. 10-17 / 1998
According to the "WWW update notification system" disclosed in Japanese Patent Publication No. 1700, a WWW server used on the Internet detects that data of the WWW server has been updated, and notifies a client-side user registered in advance. On the other hand, it is characterized in that the fact that the data of the WWW server has been updated and the update summary are transmitted by e-mail.
As a result, it is possible to reduce unnecessary traffic on the Internet, to eliminate unnecessary operations and time on the client side, and to prevent congestion on the WWW server side.

[0012]

However, the "information acquisition terminal, information cache server and information acquisition method" disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 11-15714 and the "reservation type" disclosed in the Japanese Patent Application Laid-Open No. 11-232302 are disclosed. Information retrieval and delivery method and system ", confirms whether the proxy server has updated the WWW content, and checks the WWW content.
Content is only cached periodically, and the content of WWW content on the WWW server does not always match the content of WWW content cached on the proxy server. There was a problem that was not guaranteed.

[0013] Further, in the above-mentioned conventional system, the user has to estimate the update frequency of the WWW content to be cached, and register the update frequency in the proxy server, which makes registration complicated.

[0014] Further, in the above-mentioned conventional system, the proxy server performs the corresponding WWW for each registered update timing.
Since the server is accessed to check for updates, communication occurs between the WWW server and the proxy server regardless of whether the contents have been updated. For this reason, when the proxy server has a large amount of cache reservation or when the update timing is short, there is a problem that a large amount of traffic is generated only for confirming the update.

On the other hand, Japanese Patent Application Laid-Open No. 10-171700 described above
In the “WWW update notification system” disclosed in
Since the W server notifies the user that the WWW content has been updated and the outline of the update, the client can obtain an opportunity to access the WWW content immediately after the update. However, the system includes the WWW server and the client. However, unlike communication via a proxy server, traffic reduction between a plurality of clients and a WWW server is not realized by a cache function.

Further, the above-mentioned "WWW update notification system"
In order to transmit not only the update notification but also the update summary using e-mail, if the client wants to obtain the updated WWW content, the WWW content download processing via the Internet is further performed. Will be needed. In other words, in this case, in addition to the usual WWW content acquisition processing that is not aware of the update time,
The update summary distribution process is added as traffic on the Internet.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and the WWW server notifies the proxy server when a content is updated, thereby ensuring the consistency of the cached content. It is an object of the present invention to eliminate update frequency registration work at the time of cache reservation registration and to reduce useless traffic for update check between a WWW server and a proxy server.

[0018]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, in a WWW content distribution system according to the present invention, a WWW server device that distributes WWW content, a client terminal device, and an Internet connection between the client terminal device and the WWW server device are provided. And a proxy server device that mediates data transmission and reception. In the WWW content distribution system, the proxy server device registers a cache reservation address notified from the client terminal device and stores the cache reservation address. Cache reservation means for notifying the WWW server device as a reserved address, update notification receiving means for receiving an update notification transmitted from the WWW server device, and WWW content of the address indicated by the update notification in the WWW
Content acquisition means for acquiring from the W server device and caching the acquired WWW content, wherein the WWW server device registers the reservation address notified by the proxy server device, W specified by the reserved address
Content update monitoring means for monitoring the update state of WW content;
Update notification transmitting means for transmitting the update notification to the proxy server device when the update of the WW content is detected.

According to the present invention, the WWW server notifies the proxy server of the update of the WWW content,
Since the proxy server device updates the cache by using the update notification as a trigger, the proxy server device and the W
It is possible to ensure the consistency of the WWW content held in the WWW server device.

In the proxy server device according to the next invention, in the proxy server device which mediates data transmission and reception between the client terminal device and the WWW server device via the Internet, the cache notified from the client terminal device is provided. A cache reservation unit that registers a reservation address and notifies the WWW server device of the cache reservation address as a reservation address; an update notification reception unit that receives an update notification transmitted from the WWW server device; A content acquisition unit that acquires the WWW content of the indicated address from the WWW server device and caches the acquired WWW content, and requests the WWW content of the cache reservation address from the client terminal device. Upon receiving the notification, characterized in that it returns the WWW content cached.

According to the present invention, the proxy server updates the cache by using the update notification of the WWW content received from the WWW server as a trigger, so that the WWW content held in the proxy server and the WWW server is maintained. Can be guaranteed. Also, when the client terminal device makes a cache reservation for the proxy server device, the items to be registered in the proxy server device may be only an address such as a URL.

In the proxy server device according to the next invention, in the above invention, the cache reserving means notifies the WWW server device of the identification code of the proxy server device as its own device together with the reservation address. Features.

According to the present invention, since the proxy server device can be specified by the identification code, the WWW server device can specify the proxy server device to be notified of the update together with the WWW content to be monitored.

In the WWW server device according to the next invention, the WWW server device that communicates via the Internet with the proxy server device that mediates data transmission and reception by the client terminal device, and the reservation notified from the proxy server device A reservation address registration unit for registering an address, a content update monitoring unit for monitoring an update state of WWW content specified by the registered reservation address, and when the update of the WWW content is detected by the content update monitoring unit,
Update notification transmitting means for transmitting the update notification to the proxy server device.

According to the present invention, the content update check is performed in the WWW server device, and the proxy server device is notified of the update only at the time of the update. do not do.

In the WWW server according to the next invention, in the above invention, the reservation address registration means associates the reservation address notified from the proxy server with the identification code of the proxy server. The update notification transmitting unit registers the update notification when the update of the WWW content is detected by the content update monitoring unit, and transmits the update notification to the proxy corresponding to the reserved address corresponding to the address of the WWW content. The data is transmitted to the server device.

According to the present invention, since the proxy server device can be specified by the identification code, the WWW server device can specify the proxy server device to be notified of the update together with the WWW content to be monitored.

In a WWW content distribution method according to the next invention, a WWW server device for distributing WWW content, a client terminal device, and a proxy for mediating data transmission and reception between the client terminal device and the WWW server device In a WWW content distribution method for transmitting and receiving WWW content to and from a server device via the Internet, the proxy server device registers a cache reservation address notified from the client terminal device and reserves the cache reservation address. A cache reservation step of notifying the WWW server device as an address; a reservation address registration step of registering the reservation address notified by the WWW server device from the proxy server device; A content update monitoring step of monitoring an update state of the WWW content specified by the reservation address registered in the content registration step, and when the WWW server device detects the update of the WWW content in the content update monitoring step, An update notification transmitting step of transmitting the update notification to the proxy server device, the proxy server device receiving the update notification transmitted from the WWW server device, and transmitting the WWW content of the address indicated by the received update notification to the WWW Acquiring the WWW content from the server device and caching the acquired WWW content.

According to the present invention, the WWW server notifies the proxy server of the update of the WWW content,
Since the proxy server device updates the cache by using the update notification as a trigger, the proxy server device and the W
It is possible to ensure the consistency of the WWW content held in the WWW server device.

The storage medium according to the next invention records a program for causing a computer to execute the above method, so that the program can be read by a computer, whereby the operation of the method can be realized by a computer. is there.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a WWW according to the present invention will be described.
An embodiment of a content distribution system and a WWW content distribution method will be described in detail with reference to the drawings. The present invention is not limited by the embodiment.

FIG. 1 is a diagram showing a schematic configuration of a WWW content distribution system according to an embodiment. The WWW content distribution system shown in FIG.
And a WWW client 30 connectable to the WWW server 10 via the proxy server 20.

The WWW server 10 includes a communication control unit 12 for performing various communication controls for transmitting data to the Internet 9 and receiving data from the Internet 9, and a UR for specifying WWW contents to be monitored.
L (Uniform Resource Locato
r) a reservation URL registration processing unit 13 for registering the information, a content update monitoring unit 14 for monitoring whether the WWW content has been updated, and an update notification transmission processing unit 15 for notifying when the WWW content has been updated. And a WWW content storage unit 18 that stores WWW content managed by the WWW server 10 in response to a WWW content transmission request. In FIG. 1,
Illustration of a computer configuration for functioning as a conventional WWW server is omitted.

The proxy server 20 is connected to the Internet 9
A communication control unit 22 that performs various communication controls for transmitting data to the Internet and receiving data from the Internet 9, and a cache reservation processing unit 23 that registers as a cache target in response to a request from the WWW client 30.
A content update monitoring unit 14 for monitoring whether or not the WWW content has been updated, an update notification reception processing unit 25 for receiving an update notification from the WWW server 10, and a WWW content from the WWW server 10 in response to the reception of the update notification. Content acquisition processing unit 26 to be acquired, and cache data storage unit 28 to cache the acquired WWW content
And In FIG. 1, illustration of a computer configuration for realizing a conventional proxy service is omitted.

Next, the operation of the WWW content distribution system according to the embodiment will be described. FIG. 2 is a flowchart showing a process executed on the WWW content distribution system according to the embodiment, which shows a WWW content distribution method.

First, the WWW client 30 requests the proxy server 20 to make a UR requesting a cache reservation.
L is notified (step S101). Proxy server 2
0 receives the cache reservation URL notification, and the received cache reservation URL notification is processed by the cache reservation processing unit 23. Cache reservation processing unit 23
Registers the URL indicated by the cache reservation URL notification (step S102), and registers the registered reservation URL.
To the WWW server 10 via the communication control unit 22 (step S103). Note that the cache reservation processing unit 23 records the history of making a reservation URL notification, and has a function of checking a duplicate notification before transmitting the reservation URL notification to the WWW server.

The WWW server 10 receives the reservation URL notification, and the received reservation URL notification is processed by the reservation URL registration processing unit 13. The reservation URL registration processing unit 13 registers the URL indicated by the reservation URL notification as a monitoring target (step S104). Registered reservation U
The WWW content specified by the RL is monitored by the content update monitoring unit 14 (step S10).
5). In the monitoring of the content update monitoring unit 14, when an update occurs in the WWW content to be monitored (Yes at Step S106), the update notification transmission processing unit 15 updates the WWW content of the URL to the proxy server 20 by the update notification transmission processing unit 15. A notification to the effect is made (step S107).

The proxy server 20 receives this update notification by the update notification reception processing unit 25, and the received update notification is processed by the content acquisition processing unit 26. The content acquisition processing unit 26 makes a request to the WWW server 10 to return the URL indicated in the update notification, that is, the WWW content of the reserved URL (step S108). The WWW server 10 sends the reservation UR
The content request of L is received, and the received content request is processed in the content distribution processing unit 16.
The content distribution processing unit 16 converts the URL indicated in the content request, that is, the WWW content of the reserved URL into a WWW content.
It is obtained from the WW content storage unit 18 and returned to the proxy server 20 (step S109).

The proxy server 20 receives the WWW content of the reserved URL, and the received WWW content of the reserved URL is processed by the content acquisition processing unit 26. The content acquisition processing unit 26 sets the reservation URL
Is cached in the cache data storage unit 28 (step S110).

This state, that is, step S1 described above.
When the series of processing from 01 to S110 is completed, the WWW contents of the reserved URL held by the proxy server 20 and the WWW of the reserved URL held by the WWW server 10
Content matches. In particular, proxy server 2
Since 0 triggers the caching of the WWW content when the server 10 detects the update of the WWW content, the consistency of the WWW content between the proxy server 20 and the WWW server 10 is always guaranteed.

When the WWW client 30 issues a request for returning the WWW content of the cache reservation URL to the proxy server 20 in the state after the processing of step S110 (step S111), the proxy server 20 sets the cache data storage unit 28 WW corresponding to
The W content is delivered to the WWW client 30 (step S112). That is, the WWW client 30
Can obtain the latest WWW content without accessing the WWW server 10. The above access operation of the WWW client 30 is the same even when the traveling software is used.

As described above, according to the WWW content distribution system and the WWW content distribution method according to the embodiment, since the WWW server 10 notifies the proxy server 20 of the update of the WWW content, the user can use the WWW client. When a cache reservation is made using the server 30, only the URL needs to be registered, and there is no need to estimate and register the update frequency. Further, since the proxy server 20 updates the cache triggered by the update notification from the WWW server 10, consistency of the cached data is guaranteed. Further, no unnecessary traffic flows between the WWW server 10 and the proxy server 20 for the update check.

Also, since each proxy server 20 has a history of making a cache reservation, even if another client requests a content reservation that has already been made a cache reservation, it can be determined from the history that the content has already been reserved. Therefore, no duplicate reservation is made for the same WWW server 10, and no useless traffic is generated.

[0044]

As described above, according to the present invention, according to the present invention, the WWW server notifies the proxy server of the update of the WWW contents, and the proxy server updates the cache by using the update notification as a trigger. Therefore, it is possible to ensure the consistency of the WWW contents held in the proxy server device and the WWW server device, and to register only the address such as the URL in the proxy server device. Therefore, there is an effect that periodic traffic such as an update check as in the conventional method does not occur.

According to the next invention, the proxy server updates the cache by using the update notification of the WWW content received from the WWW server as a trigger, so that the WWW held in the proxy server and the WWW server is maintained. It is possible to ensure the consistency of the contents, and when the client terminal device makes a cache reservation to the proxy server device, only items such as URLs need be registered in the proxy server device. Is simplified,
This has an effect that the traffic amount can be reduced as compared with the conventional update check from the proxy server side.

According to the next invention, the proxy server device can be specified by the identification code.
On the server device side, it is possible to specify the proxy server device to be notified of the update together with the WWW content to be monitored, and it is possible to manage the WWW content to be monitored and the update notification destination in association with each other.

According to the next invention, the content update check is performed in the WWW server device, and the update notification is sent to the proxy server device only at the time of update.
This has the effect of reducing the traffic volume as compared with the conventional communication for each update check.

According to the next invention, the proxy server can be specified by the identification code.
The server device can specify the proxy server device to be notified of the update together with the WWW content to be monitored, and has an effect that the monitored WWW content and the update notification destination can be managed in association with each other.

According to the next invention, the WWW server notifies the proxy server of the update of the WWW contents, and the proxy server updates the cache with the update notification as a trigger. It is possible to ensure the consistency of the WWW content held in the server device,
Since only items such as URLs need be registered in the proxy server device, cache reservation is simplified, and there is an effect that periodic traffic such as an update check as in the conventional method does not occur.

According to the next invention, by recording a program for causing a computer to execute the above-described method, the program becomes readable by a computer, whereby the operation according to the above-described method can be realized by the computer. This produces an effect that a recording medium can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a WWW content distribution system according to an embodiment.

FIG. 2 is a flowchart showing processing executed on the WWW content distribution system according to the embodiment;

FIG. 3 is a conventional system block diagram.

[Explanation of symbols]

9 Internet, 10 WWW server, 12, 22
Communication control unit, 13 reserved URL registration processing unit, 14 content update monitoring unit, 15 update notification transmission processing unit, 16
Content distribution processing unit, 18 WWW content storage unit, 20 proxy server, 23 cache reservation processing unit, 25 update notification reception processing unit, 26 content acquisition processing unit, 28 cache data storage unit, 30 WWW client.

 ──────────────────────────────────────────────────続 き Continuation of the front page (54) [Title of the Invention] WWW content distribution system, proxy server device, WWW server device, WWW content distribution method, and computer readable recording recording a program for causing a computer to execute the method Medium

Claims (7)

[Claims] 1. A WWW server device for distributing WWW contents, a client terminal device, a proxy server device for mediating data transmission and reception between the client terminal device and the WWW server device via the Internet,
In the WWW content distribution system configured to include: the proxy server device registers a cache reservation address notified from the client terminal device, and notifies the WWW server device of the cache reservation address as a reservation address. A cache reservation unit; an update notification receiving unit that receives an update notification transmitted from the WWW server device; a WWW content of an address indicated by the update notification is acquired from the WWW server device;
Content acquisition means for caching W content, wherein the WWW server device registers a reservation address notified from the proxy server device, and updates WWW content specified by the registered reservation address. Content update monitoring means for monitoring status; and update notification transmission means for transmitting the update notification to the proxy server device when the update of the WWW content is detected by the content update monitoring means. Characteristic WWW content distribution system. 2. A proxy server device for mediating data transmission and reception between a client terminal device and a WWW server device via the Internet, wherein a cache reservation address notified from the client terminal device is registered and the cache reservation address is registered. A cache reservation unit for notifying the WWW server device of the update notification as a reservation address; an update notification receiving unit for receiving an update notification transmitted from the WWW server device; and a WWW content of the address indicated by the update notification from the WWW server device. Acquired and acquired WW
Content acquisition means for caching W content, wherein the proxy server returns the cached WWW content when receiving a notification requesting the WWW content of the cache reservation address from the client terminal device. apparatus. 3. The proxy server device according to claim 2, wherein the cache reservation unit notifies the WWW server device of an identification code of the proxy server device which is its own device, together with a reservation address. 4. A WWW server device that communicates via the Internet with a proxy server device that mediates data transmission and reception by a client terminal device, wherein: a reservation address registration unit that registers a reservation address notified from the proxy server device; A content update monitoring unit that monitors an update state of the WWW content specified by the reserved address, and, when the update of the WWW content is detected by the content update monitoring unit, transmits the update notification to the proxy server device. A WWW server device comprising: an update notification transmitting unit. 5. The reservation address registering unit registers the reservation address notified from the proxy server device and the identification code of the proxy server device in association with each other, and the update notification transmitting unit includes the content update monitoring unit. 5. When the update of the WWW content is detected by the above, the update notification is transmitted to the proxy server device associated with the reserved address corresponding to the address of the WWW content. 6. WWW server device. 6. A WWW server via the Internet between a WWW server device that distributes WWW contents, a client terminal device, and a proxy server device that mediates data transmission and reception between the client terminal device and the WWW server device. In the WWW content distribution method for transmitting and receiving contents, a cache reservation step in which the proxy server device registers a cache reservation address notified from the client terminal device and notifies the WWW server device of the cache reservation address as a reservation address. A reservation address registration step in which the WWW server device registers a reservation address notified from the proxy server device; and the WWW server device is specified by the reservation address registered in the reservation address registration step. A content update monitoring step of monitoring an update state of WWW content; and an update notification transmitting the update notification to the proxy server device when the WWW server device detects an update of the WWW content in the content update monitoring step. A transmitting step, wherein the proxy server device receives the update notification transmitted from the WWW server device, acquires the WWW content of the address indicated by the received update notification from the WWW server device, and caches the acquired WWW content. A WWW content distribution method, comprising: 7. A computer-readable recording medium on which a program for causing a computer to execute the method according to claim 6 is recorded.