KR100309785B1 - Method of data transference between servers using cgi program - Google Patents

Abstract

PURPOSE: A method for transmitting data among multi-servers using a CGI(Common Gateway Interface) program is provided to make the multi-step information access among multi-servers on a web and to reduce the frequency of authentication of a web server. CONSTITUTION: The method comprises the steps of a web server confirming an authentication of web client as the web client requests data to the web server(302), a CGI program of web server judging that the request is a simple request of data by parsing the parameter value of CGI in a HTML(HyperText Markup Language) statement(304), the CGI program transmitting the processed data to the web client in case of the simple request(308), and the CGI program transmitting the HTML statement converting the parameter value of CGI into a variable to another lower web server including the URL(Uniform Resource Locator) address in case of the CGI processed data request including the Internet URL assigning a lower server(310).

Description

Method of data transfer between multiple servers using common gateway interface program {Method of data transference between servers using cgi program}

The present invention relates to a data transmission method between multiple servers using a common gateway interface (hereinafter referred to as "CGI") program on a web client and a web server.

With the widespread use of the World Wide Web, web servers are being used to build Internet homepages or for intra-company intranets. The web service installs only a browser program on the web client and uses the HyperText Transfer Protocol (hereinafter referred to as "HTTP") to display the HyperText Markup Language on the web server. "HTML") or web client software.

On the other hand, in the existing client-server model, an execution program was created by separately implementing a communication module for each program. However, in the web model, even if each application program does not have a communication module, it is possible to use HTTP that a web server and a browser have. Communication is possible.

The basic concept of HTTP used on the web is to continuously search for information by hypertext, and the basic concept of web service is to reduce the load on the server by maintaining connectionlessness after retrieving the information from the web server. Therefore, a uniform resource identifier (hereinafter referred to as a "URL") address must be connected to each connection, and there is a problem in that multiple servers cannot obtain associated information through one web server.

In this case, the reason for not re-authenticating the previously visited part is that since the information is left in the browser using a technology called Cookie, it is connected once connected.

1 is a block diagram of a conventional data transmission system.

As shown in the figure, the web client 101 requests data by connecting a communication channel with a program of the web server 103 by HTTP using a web browser, and connects to an anchor of HTML in the request process. Specify server 103. As described above, the web client 101 indicates that the web server 103 is connected to the anchor as needed.

Also, in the conventional method of transmitting data on a web-connected multi-server, simple HTML and CGI alone are impossible in principle (because the screen to receive the result is the contents of the second server or less within the screen of the first server). ), And there is a method that can be linked only at the data level using DB Link technology on a hierarchical multi-server based on a database management system (DBMS). The database can be serviced by developing a web application on a server and separately setting up database management system connection software on a web server that is attached to an infrastructure. However, the database management system connection software must be separately set up on a web server. There was a problem.

Therefore, the present invention proposed to solve the above problems, by changing the value of the anchor (Anchor), which is an HTML sentence component using the CGI program in the CGI parameters, the client appears to access a single server, but is actually performed Data result values are collected on hierarchical multi-servers and sprayed on a single screen, while contributing the ability to modify and process data on multi-servers to facilitate multi-level information access between multi-servers on the web. Its purpose is to provide a data transfer method between multiple servers that can reduce the number of user authentications.

1 is a block diagram of a conventional data transmission system.

2 is an exemplary configuration diagram of a data transmission system between multiple servers to which the present invention is applied.

3 is a flowchart illustrating an embodiment of a method for transmitting data between multiple servers according to the present invention.

* Explanation of symbols for main parts of the drawings

101, 201: web client 102, 202: application

103, 203: web server 104, 204: CGI program

In the method of the present invention for achieving the above object, in a data transmission method applied to a multi-server data transmission system hierarchically configured, a web client requests data from a web server, and the web server requests the web client. Verifying user authentication for the first step; A second step for the authenticated user, whether the common gateway interface (CGI) program of the web server parses the common gateway interface (CGI) parameter value in a hypertext markup language (HTML) sentence to determine whether it is a simple data requirement; ; A third step of processing the data by the common gateway interface (CGI) program and transmitting the processed data to the web client if it is a simple data requirement as a result of the determination of the second step; And a common gateway interface (CGI) processing data requirement (data requirement to another web server) including an internet address (URL) designating a lower server as a result of the determination in the second step. The fourth step of the program parameterizing the common gateway interface (CGI) parameter value to transmit the variable hypertext markup language (HTML) sentence to the other web server including the Internet address (URL).

The present invention proposes a multi-level information access method on the web using CGI, and changes the value of an anchor, which is an HTML sentence component, using CGI. In other words, the web server is multi-level multi-server by using the web server to utilize the HTML protocol for information transfer and sending the data necessary for data processing to the remote web server and receiving the result of the execution of the CGI program on the remote web server. It can be used for computing environment.

That is, the present invention changes the value of an anchor, which is an HTML sentence component, in a CGI parameter by using a CGI program, but the client appears to access a single server, but the actual result of the data is executed in a hierarchically configured multi-server. Contrary to the role of collecting and sprinkling on a single screen, multi-server data can be modified and processed to facilitate multi-level information access between multiple servers on the web. Can be reduced.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary configuration diagram of a data transmission system between multiple servers to which the present invention is applied.

As shown in FIG. 2, when the web client 201 requests data from the web server 203, the web server 203 performs a user authentication process to confirm whether the user of the web client 201 is a legitimate person. .

Thereafter, the request of the user who passed the authentication process is transmitted to the web server 203. The web server 203 determines whether the user's request is simple HTML or CGI including a URL specifying a subordinate server. If it is, the data is transmitted to the web client 201, and if it is CGI, the CGI program 204 checks the parameter value.

Next, if it is a simple data requirement, the CGI program 204 processes the data and sends it to the web client 201, and if it is not a simple data requirement, the CGI program 204 variables the CGI parameter value in the HTML statement to be variable. Send HTML statements to another web server.

The following describes how to handle CGI variables. Normal CGI sends and receives data by GET and POST method.

end. GET CGI Format (Example)

<FORM target = mybody ACTION = "http://www.kt.co.kr/~infop/wcgi.cgi?K=$K&U = $ U & ADDR = $ ADDR" METHOD = GET NAME = "SearchForm" onSubmit = "return checkValue (this); ">

I. POST-based CGI format (example)

<FORM METHOD = POST ACTION = "HTTP://147.6.1.5/work/guest.cgi">

<INPUT TYPE = HIDDEN NAME = "ID" VALUE = "GUEST">

Name: <INPUT TYPE = TEXT NAME = "USERNAME" SIZE = 15> <BR>

HTTP, a feature of the web, cannot maintain a persistent connection. Not re-authenticating previously visited portions of the browser using a technology called Cookie, which leaves the information in the browser, so it appears to be connected once connected.

In the case of wcgi.cgi in paragraph (a) or guest.cgi in paragraph (b), it performs general CGI functions, and in case of (a), variable values $ K, $ U, $ for variables K, U, and ADDR. The ADDR value is received and processed, and in the case of (b), the variable value GUEST and the text to be input from the screen are processed for the variable ID and the user name.

In the above example, substituting the variables K, U, ADDR, ID, and USERNAMEs for the variable with the value of another server creates a variable value by assigning a URL value to the variable value and through a series of processes in the CGI program. There is a way. Perform the following as a variable value of another server. In the CGI program, the method of creating a string is a string manipulation method, in which a string is manipulated in one variable, and the following example value is changed and assigned to the variable.

When the lower server CGI value is

<FORM NAME = "DT" ACTION = "http://147.6.10.10/~hh/app.cgi?sys=rd&pid=kt_doci.html" METHOD = GET>

The full HTML result request statement, including the contents of the subserver at the multiserver address, looks like this:

<FORM target = mybody ACTION = "http://www.kt.co.kr/~infop/wcgi.cgi?K=$K&U=$U&ADDR=$ADDR(http://147.6.10.10/~hh/app .cgi? sys = rd & pid = kt_doci.html) "METHOD = GET NAME =" SearchForm "onSubmit =" return checkValue (this); ">

ADDR = <FORM NAME = "DT" ACTION = "http://147.6.10.10/~hh/app.cgi?sys=rd&pid=kt_doci.html" METHOD = GET>

In CGI function, CGI program of the first server that receives other server URL value generates HTML value by CGI manipulation process from URL below the second server and displays it in HTML that is response of CGI of first server.

The operation for exchanging data between the first server and the second subordinate server is performed through the first CGI between the servers regardless of the client. The CGI of the first server has a function to check the holding time for generating HTML data below the second server.

As a result, the CGI program has a function of parsing ADDR and parsing the address part such as replacing the link information of another server with a variable value while having a parsing function having a judging function to set communication status and exchange data between multiple servers. have.

Therefore, if the above method is applied step by step, another web server can be accessed using a CGI program, and thus data access can be processed step by step on a multi-server.

3 is a flowchart illustrating an embodiment of a method for transmitting data between multiple servers according to the present invention.

As shown in FIG. 3, the web client establishes a connection to the web server using a URL and requests for termination (301).

After that, it is determined whether the user authentication is confirmed for the web client requesting the data (302), and if the authentication is not confirmed, the connection is released (303). If the user authentication is confirmed, the HTML sentence of the data request is simple HTML or If it is CGI (304), if it is simple HTML, the web server transmits the data to the client (305). If it is CGI including the URL of the lower layer, the CGI program of the upper server checks the CGI parameter value (306).

Subsequently, it is determined whether it is a simple data requirement (307), and if it is a simple data requirement, the CGI program processes the data and transmits the processed data to the web client (308), and the CGI processing including a URL specifying a subordinate server. If it is a data requirement, the CGI program variables the CGI parameter values (309).

Next, the CGI program establishes a connection with another web server to transmit the variable HTML sentence to another web server (310), and the other web server determines whether the HTML sentence of the transmitted data request is simple HTML or CGI. Repeat from the beginning.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

Therefore, the present invention as described above can not only utilize a distributed computing environment as a centralized data management system in a large-scale enterprise in a closed group such as an intranet, but also single-sign-on without installing web server authentication separately. -Sign-On) can be implemented, and various services can be changed in a hierarchically distributed environment using a CGI program, thereby processing the data and providing the processed data.

Claims (2)

In the data transmission method applied to hierarchically configured data transmission system between multiple servers, A first step wherein a web client requests data from a web server, the web server confirming user authentication with the web client; A second step for the authenticated user, whether the common gateway interface (CGI) program of the web server parses the common gateway interface (CGI) parameter value in a hypertext markup language (HTML) sentence to determine whether it is a simple data requirement; ; A third step of processing the data by the common gateway interface (CGI) program and transmitting the processed data to the web client if it is a simple data requirement as a result of the determination of the second step; And If the determination result of the second step is a common gateway interface (CGI) processing data requirement (data requirement to another web server) including an Internet address (URL) for designating a lower server, the common gateway interface (CGI). The fourth step of the program parameterizing the common gateway interface (CGI) parameter value and transmitting the variable hypertext markup language (HTML) sentence to the other web server including the Internet address (URL). Data transmission method between the multi-server using a common gateway interface program comprising a. The method of claim 1, The second step, A fifth step of determining whether the hypertext markup language (HTML) sentence of the material request is a simple hypertext markup language (HTML) or a common gateway interface (CGI); A sixth step of transmitting, by the web server, the material to the web client if it is a simple hypertext markup language (HTML); And A seventh step of determining whether the common gateway interface (CGI) is a simple data requirement after the common gateway interface (CGI) program checks the common gateway interface (CGI) parameter value if the determination result of the fifth step is a common gateway interface (CGI); Data transmission method between the multi-server using a common gateway interface program comprising a.