KR20020085996A - Method of Providing a Web Page Using Client Cache Memory - Google Patents

Abstract

The present invention relates to a method for providing a web page in a web service system that can be implemented through a communication network between a client computer and a server computer.

As the client computer connects to the server computer, when the identifier, source code, including the URL information of the web page is transmitted from the server computer, the client computer stores the identifier and the source code in cache memory and displays the web page. . Then, when a link page is selected by a user or a new URL is input, a search is made whether the URL or the input URL of the selected link page is stored in the cache memory. If the same URL exists in the cache memory, the web page is displayed. If the same URL is not stored, the page is requested to the server computer. When the page information corresponding to the request of the client computer is transmitted from the server computer, the process proceeds to storing and displaying the page information.

The present invention can be applied to all documents including the CGI document, the server computer providing a service can be prevented from increasing the load on the server, the user side has the advantage that the desired information can be provided quickly.

Description

Method of Providing a Web Page Using Client Cache Memory}

The present invention relates to a service providing method in a web service system that can be implemented through a communication network between a client computer and a server computer, and more particularly, to a web page providing method using a client cache memory.

In general, in communication between a client computer and a server computer, when the client computer requests information, the server computer sends the request result written in the form of a web page to the client computer for display by the web browser. Here, the server computer refers to a server that provides all web services including an Internet-based information provider server that provides e-mail, e-commerce, a server that is in charge of an intranet within an enterprise, and the like.

In such a web service system, there is at least one client computer. When a plurality of client computers connected to the server computer request the same information, the server computer must transmit the same request result. The load on the computer is increased and communication efficiency is reduced.

5 is a schematic structural diagram of a communication network for explaining a conventional web page providing method. In FIG. 5, at least one client computer 10-1 to 10-n has an environment in which the server computer 20 can communicate with each other via the communication network 30.

Referring to FIG. 5, the server computer 20 further includes a cache server 24 in addition to the main server 22 for generating and managing information for providing to the client computers 10-1 to 10-n. The server computer 20 stores the corresponding web page in the cache server 24 whenever there is a request for information from the client computers 10-1 through 10-n, and stores a copy of the client computer 10-1 through 10-n. To send). When a request for information from the client computers 10-1 to 10-n occurs, it is checked whether a web page that responds to the request is stored in the cache server 24, and when it is stored in the cache server 24. Information stored in the cache server 24 is transmitted.

In this case, however, the load on the server computer 20 can be reduced, but there is a problem that the load on the cache server 24 is increased. In addition, when a large number of client computers 10-1 to 10-n request information from the server computer 20, the waiting time for obtaining the request result is increased. There is a disadvantage that the quality of service (QoS) is reduced.

In order to solve this problem, a cache function of a web browser is currently used to store a request result of a client computer in cache memory of each client computer.

That is, when the client computers 10-1 to 10-n request information from the server computer 20 and the server computer 20 receives a response in the form of a web page, the client computers 10-1 to 10-n receive the information. The comparator including the creation date and size of the web page and the source code of the web page are stored in the cache memory. If the same information request is generated from the client computers 10-1 to 10-n for a certain period of time, the client computer 10-1 checks whether the request result is stored in its cache memory before accessing the server computer 20.

If the result of the request is stored in the cache memory, the server accesses the server computer 20, reads the comparison factor of the requested page, and compares the comparison factor with the corresponding web page stored in the cache memory. As a result of the comparison, if the comparison factors are the same, the web page stored in the cache memory is displayed in the browser of the client computers 10-1 to 10-n. Otherwise, the page is received from the server computer 20 and displayed.

This method can reduce the load on the server computer and reduce the response time of the client computer's request. However, the request result can be delivered directly by the server computer without using the Common Gateway Interface (CGI). The state is limited to general requests for documents such as HTML and XML, and additional requests such as image files and script files required with service result documents.

In other words, in the case of a web page created by CGI (Common Gateway Interface) programming (hereinafter referred to as a 'CGI document'), the effect described above cannot be achieved. Because the CGI document is updated with the creation date of the CGI document as soon as the document is requested, the comparators change at the moment the document is requested, so that when compared with the comparator stored in cache memory, Because it turns out. Therefore, storing a CGI document in cache memory results in a waste of cache memory. Therefore, in recent years, a page writing format is read from a web page transmitted from a server and stored in the cache memory only when it is not a CGI document. The method is mainly used.

Therefore, if the information requested by the client computer has the form of CGI document, the server computer must provide the same type of web page every time for the same information request of the client computer, so the load increases as the number of client computers increases. This slows down the display of Web pages in the client computer's browser.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a method of providing a web page using a client cache memory that can reduce the burden on the server computer and reduce the response time for a request from the client computer. There is a technical problem.

According to another aspect of the present invention, even if the document requested by the client computer is a CGI document, the web page using the client cache memory may store the document in the cache memory and provide the stored CGI document without errors in response to a request of the client computer. To show how to provide.

Another technical problem of the present invention is to allow a web page stored in a cache memory to be periodically updated at a time set in a server computer and a time set in a client computer, thereby providing a more accurate information to a client computer user. To present a web page providing method using.

1 is a schematic configuration diagram of a communication network to which the present invention is applied.

2 is a flowchart illustrating a web page providing method according to the present invention.

3 is a flowchart illustrating a process of storing a web page in a cache memory in the web page providing method according to the present invention.

4 is a diagram illustrating an example of a web page storage record applied to the present invention.

5 is a schematic configuration diagram of a communication network for explaining a conventional web page providing method.

<Description of the symbols for the main parts of the drawings>

10-1 to 10-n: client computer 20: server computer

22: main server 24: cache server

26-1 to 26-n Cache memory 40 Record

42: URL storage field 44: Separator storage field

46: source code storage fields

The present invention for achieving the above technical problem is a web service consisting of a plurality of client computers having a network interface, a web browser and a cache memory and a plurality of server computers that can be interconnected and interconnected by the client computer and the communication network In the system, a method of providing a web page from the server computer to the client computer, wherein as the client computer accesses the server computer as a first step, URL information of a web page for a service initial screen is obtained from the server computer. The identifier, including the source code, is sent.

In the second step, the client computer stores the identifier and source code in the cache memory and displays the web page. In the third step, when the page linked to the displayed web page is selected or a new URL is input. Read the URL or the input URL of the selected link page to check whether the switching of the server computer has occurred, and as a fourth step, if the server computer is not switched, the URL or input URL of the selected link page is stored in the cache memory Search for existence.

In the fifth step, if the same URL exists in the cache memory, the source code of the URL is read and the web page is displayed in the browser. In the sixth step, if the same URL is not stored in the cache memory, the selected URL is selected. Request the page by sending the URL or input URL of the link page to the server computer. After the page information corresponding to the request of the client computer is transmitted from the server computer in step 7, the process proceeds to the second step and repeats the subsequent steps.

When the server computer is switched in the third step, all the web pages stored in the cache memory of the client computer are deleted, and after the first step after connecting with the switched server computer, Do it.

The cache memory may include a URL storage field for storing a URL of a web page transmitted from a server computer, a separator storage field for storing a separator of a web page, and a source code storage field for storing a source code of a web page. The second step may include: extracting, by the client computer, URL information from the transmitted identifier, and storing an address number in the recently used URL storage field in the URL storage field of the increased address; Generating a unique delimiter for identifying the web page, and storing the delimiter in a delimiter storage field of an address identical to an address of a field storing the URL information; Storing the source code of the web page in a corresponding area of a source code storage field indicated by the delimiter; And displaying the web page.

In addition, the web page stored in the cache memory is connected to the server computer at a time period set by the server computer or a time period set by the client computer user to update the stored web page information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic structural diagram of a communication network to which the present invention is applied.

As shown, at least one client computer 10-1 to 10-n has an environment in which it can communicate with the server computer 20 via the communication network 30. Here, the client computers 10-1 to 10-n have a network interface such as a modem and preferably have a browser supported by JavaScript, and each cache memory 26-1 to 26-n is provided. Holds.

The communication network 30 is a set of networks interconnected by standard protocols such as TCP / IP and HTTP, and wireless Internet protocols (e.g., WAP, etc.), including changes or additions to existing standard protocols. It is a concept that includes various changes that can be made.

When the client computers 10-1 to 10-n request the information by accessing the server computer 20 that provides the web service through the communication network 30, the server computer 20 returns the result in response to the request. Transfer it to (10-1 to 10-n).

The client computers 10-1 to 10-n display the received request results through the browser and store them in the cache memories 26-1 to 26-n so that the cache memory 26-n can be requested later when the same request result is requested. Web pages stored in 1 to 26-n) can be displayed. A method of displaying a web page transmitted from the server computer 20 and storing it in the cache memories 26-1 to 26-n will be described with reference to Figs.

2 is a flowchart illustrating a web page providing method according to the present invention.

A user who wants to use the web service accesses the desired server computer 20 by using the client computers 10-1 through 10-n (S101). The server computer 20 transmits to the client computers 10-1 to 10-n, identification factors, source codes, and the like including URL information of a web page for displaying an initial screen of a service provided by the server computer (S102). .

The client computers 10-1 to 10-n that have received the information about the initial page from the server computer 20 store the received page information in the cache memories 26-1 to 26-n, and correspond to a browser. The web page is displayed (S103). Here, the method of storing the transmitted web page information will be described later with reference to FIGS. 3 and 4.

After the initial service screen is displayed on the user client computers 10-1 to 10-n, if a page linked to the web page currently displayed by the user is selected or a new URL is input (S104), the client computer 10 -1 to 10-n checks whether the server computer currently connected to the client computers 10-1 to 10-n has been switched to another server computer using the URL or the input URL of the selected link page (S105). .

If the server computer is not switched as a result of the server computer check, it is searched whether the URL or the input URL of the selected link page is stored in the cache memory (S106). As a result of searching whether the same URL exists, when the same URL exists in the cache memory, the web page of the corresponding URL is displayed in the browser (S107). On the other hand, if the same URL is not stored, the page is requested by transmitting the URL or input URL of the selected link page to the server computer (S108).

The server computer receiving the request of the client computer transmits page information corresponding to the request to the client computer (S109). Thereafter, the client computer proceeds to step S103 of storing the information of the web page transmitted from the server computer, and repeats the subsequent process.

Web page information stored in the cache memory should be updated periodically. When the web page is provided by the server computer that provides the web page, the update cycle time is set. When the page is provided with the update information, the cache of the client computer is provided. It is stored in the memory and updated by establishing a connection with the server computer every set time. On the other hand, if the page update function is added to the web browser of the client computer and the page update information can be arbitrarily set by the user, the web page information stored in the cache memory is updated by connecting with the server computer at the time set by the user. .

On the other hand, a page linked to the currently displayed web page is selected or a new URL is input (S104), and is connected to the current client computers 10-1 to 10-n using the URL or input URL of the selected link page. In step S105 of checking whether the server computer is switched from the server computer to another server computer, when the server computer is switched, the information about all the web pages stored in the cache memory of the client computer is deleted (S110).

The reason why the information of all the web pages stored in the cache memory is deleted when the server computer is switched is because the web page providing method of the present invention is implemented in a script language. The scripting language retains the information of web pages (including linked pages) provided by the server computer only when it is in contact with a particular server computer, and the connection with that server computer is terminated or a switchover to another server computer occurs. This feature has the characteristic that all page information that is held is deleted. That is, when a connection is made with one server computer, the entire cache memory is allocated to the server computer.

After all the page information stored in the cache memory is deleted after the switching of the server computer, the client computer is switched to the switched server computer (S101) to receive and store the web page by the method described above.

3 is a flowchart illustrating a process of storing a web page in a cache memory in the method of providing a web page according to the present invention, and FIG. 4 is a diagram illustrating an example of a web page storage record applied to the present invention.

When a client computer accesses a server computer and receives a web page, the server computer transmits an identifier, source code, and the like including URL information of the page. The client computer extracts the URL information from the transmitted identifier and stores it in a valid address field of the URL storage field 42 (S201). In this case, a separator for distinguishing a corresponding page is generated and stored in the same address field of the separator storage field 44 (S202).

Thereafter, the source code of the transmitted page is stored in the corresponding area of the source code storage field 46 indicated by the separator (S203), the page displayed in the browser is erased, and the currently stored page is displayed (S204).

For example, when a service request occurs from a client computer and the server computer wants to provide a page corresponding to the request, the server computer may include an identifier, including URL information (www.a.com), a source code (document in HTML format). ) To the client computer. The client computer extracts URL information (www.a.com) from the identifier and stores it in address 0 of the URL storage field 42 (URL <0> = www.a.com). In addition, a separator for identifying www.a.com is generated and stored in the same identifier storage field as the address of the URL storage field 42 in which the URL information is stored (index <0> = 1). The source code of www.a.com is recorded at the address designated by the separator of the source code storage field 46.

On the other hand, when the user requests another page by link selection or address input, first, it is checked whether the URL or the input URL of the link selected by the user exists in the URL storage field, and if so, the address is read. For example, referring to FIG. 4, if the URL of the link to which the user wants to go is www.b.com, it can be seen that the address of the field where the URL is stored is (n-1).

Then, it searches the delimiter storage field of the read address and reads what value is stored. In FIG. 4, it can be seen that index <n-1> = n is stored in the delimiter storage field. Thereafter, the code recorded at the n address of the source code storage field is read so that the web page is displayed on the browser. The method of providing the page stored in the cache memory can be equally applied to the 'back' and 'forward' functions in the browser.

On the other hand, if the URL of the link selected or the URL entered by the user does not exist in the URL storage field, the page is requested to be provided to the server computer, and the page information transmitted from the server computer is stored in the cache memory by the method described above. At this time, the address number of the URL saving field and the delimiter storing field is increased by one (x = x ++) than the address number of the previously stored page, and the delimiter is set so as not to overlap with the previously stored delimiter.

The URL storage field 42, the delimiter storage field 44 and the source code storage field 46 may be composed of each record or one record 40 in an arrangement.

The web page providing method described above is produced as a program so that it can be executed on the browser when the web browser is executed. The program is preferably written in a script language such as Javascript or VB script.

The present invention stores the information including the source code of the page provided from the server computer in the cache memory of the client computer, and if there is the same page request later, displays the page by the source code stored in the cache memory with reference to the URL of the page do. That is, the information stored in the client computer is not compared with the information provided by the server computer with respect to the information of the requested page, and the page is displayed by the source code stored in the client computer regardless of the server computer. Therefore, the CGI document can be stored in the cache memory and respond later to a later request.

In addition, instead of displaying the pages stored in the cache memory without comparing them with the server computer, the stored page information is periodically updated at a time set by the server computer or at a time arbitrarily set by the user, thereby providing more accurate information to the user. have.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described above, the present invention stores the information including the source code of the web page requested by the user in the cache memory of the client computer, and if the same page is required, then calling and displaying the page from the cache memory to provide a service On the server computer side, the load on the server can be prevented, and on the user side, the desired information can be provided quickly.

In addition, it is possible to provide more accurate information to the user by periodically updating the web page stored in the cache memory at every web page update cycle set by the server computer or at an update cycle set by the user.

According to the advantages of the present invention, even if the CGI document is stored in the cache memory of the client computer and periodically updated, the CGI document of accurate contents can be provided to the user.

Claims (7)

In a web service system comprising a plurality of client computers having a network interface, a web browser and a cache memory, and a plurality of server computers interconnected by the client computer and communicated with each other, the server computer to the client computer. As a method of serving a web page, A first step of transmitting an identifier and source code including URL information of a web page of a service initial screen from the server computer as the client computer accesses the server computer; The client computer storing the identifier and source code in the cache memory and displaying a corresponding web page; A third step of checking whether a switching of the server computer has occurred by reading a URL or an input URL of the selected link page when a page linked to the displayed web page is selected or a new URL is input; A fourth step of searching whether the URL or the input URL of the selected link page is stored in the cache memory when the server computer is not switched; If the same URL exists in the cache memory, reading a source code of the corresponding URL and displaying a web page in a browser; If the same URL is not stored in the cache memory, transmitting a URL or an input URL of the selected link page to the server computer to request the page; A seventh step of transmitting page information corresponding to a request of a client computer from the server computer; An eighth step of proceeding to the second step and repeating subsequent steps; A ninth step of deleting information on all web pages stored in the cache memory of the client computer when the server computer is switched in the third step; And A tenth step of performing a process after the first step after being connected to the switched server computer; Web page providing method using a client cache memory including a. According to claim 1, The cache memory includes a URL storage field for storing the URL of the web page transmitted from the server computer, a separator storage field for storing the separator of the web page, and a source code storage field for storing the source code of the web page. The second step may include: extracting, by the client computer, URL information from the transmitted identifier, and storing an address number in the recently used URL storage field in the URL storage field of the increased address; Generating a unique delimiter for identifying the web page, and storing the delimiter in a delimiter storage field of an address identical to an address of a field storing the URL information; Storing the source code of the web page in a corresponding area of a source code storage field indicated by the delimiter; And Displaying the web page; Web page providing method using a client cache memory including a. The method of claim 2, A method of providing a web page using client cache memory in which a URL storage field, a delimiter storage field, and a source code storage field are composed of each record or one record of an array. According to claim 1, And updating the stored web page information by connecting to the server computer at a time period set by the server computer for the web page stored in the cache memory between any steps after the second step. How to serve web pages using memory. According to claim 1, And updating the stored web page information by connecting to the server computer at a time period set by the client computer user for the web page stored in the cache memory between any steps after the second step. How to serve web pages using cache memory. According to claim 1, Wherein each step is a web page providing method using a client cache implemented using a scripting language. In a web service system comprising a plurality of client computers having a network interface, a web browser and a cache memory, and a plurality of server computers interconnected by the client computer and communicated with each other, the client computer from the server computer. To be provided with a web page, As the client computer accesses the server computer, an identification factor including source URL information of a web page of a service initial screen is transmitted from the server computer; The client computer storing the identifier and source code in the cache memory and displaying a corresponding web page; Reading a URL or an input URL of the selected link page when a page linked to the displayed web page is selected or a new URL is input to check whether a switching of the server computer has occurred; Searching if the URL or input URL of the selected link page is stored in the cache memory when the server computer is not switched; A function of reading a source code of a corresponding URL and displaying a web page in a browser when the same URL exists in the cache memory; If the same URL is not stored in the cache memory, requesting a page by transmitting a URL or an input URL of a selected link page to a server computer; A function of transmitting page information corresponding to a request of a client computer from the server computer; Proceeding to the second step and repeating subsequent steps; When the server computer is switched in the third step, deleting information on all web pages stored in the cache memory of the client computer; And Performing a process after the first step after being connected to the switched server computer; A computer-readable recording medium that records a program for executing the program.