KR20020008579A - Web Proxy Solution with Compression - Google Patents

Abstract

PURPOSE: A web proxy solution having a compression function is provided to reduce communication cost and time by reducing communication volume. CONSTITUTION: A compression module(2') compresses a request data from an external HTTP server(3), transmits the compressed request data to a user terminal(1), and decompresses the compressed request data. The compression module(2') is embodied in a socket library which is an interface of a web browser for a transmission control protocol(TCP) layer performing information between terminals on an Internet communication protocol. The user terminal(1) is divided into a wireless personal digital assistant(1') having the compression module and a mobile personal computer(1") which does not have the compression module. The wireless personal digital assistant(1') is a terminal in which the network module having the compression module such as the socket library and the TCP module is installed. In addition, the wireless personal digital assistant(1') can receive the compressed contents from a mobile web proxy server. The mobile personal computer(1") employs a general network module, and receives normal type information.

Description

Web Proxy Solution with Compression

Field of invention

The present invention relates to a web proxy server for a web based internet service in a wired / wireless computing environment. More specifically, it provides a mobile web proxy server solution that adds a compression function to the existing wired / wireless web proxy server and provides a compression related function to the communication module of the terminal to provide a web browser. By compressing and transmitting the data transmitted between the proxy server and the web browser without changing the data, the absolute transmission amount is reduced, thereby improving the communication speed and reducing the load on the network. (multimedia) service is made possible.

Background of the Invention

A conventional web proxy server is a special purpose HTTP server, which is generally combined with an Internet firewall to substitute a request for an external HTTP server of a web browser and store the content once requested for subsequent requests. Performs a cache function for

With reference to the accompanying drawings will be described a schematic operation principle of the conventional web proxy server. 3 illustrates a schematic Internet environment including a conventional web proxy server, wherein the web proxy server 8 requests information from the web browser mounted on the user terminal 1 to the external HTTP server 30. Receives and transfers the request information to the external HTTP server (3) on behalf of the web browser.

The web proxy server 8 delivers the request information to the web browser, and stores the content transmitted from the HTTP server 3 in a cache memory for future reuse. Then, when the request information of the same content is requested by the web browser, the information stored in the web proxy server 8 is directly transmitted to the web browser without accessing the external HTTP server 3.

The above-described conventional web proxy server is mainly designed based on a wired internet having a high network rental width, and thus does not show a great effect in a wireless environment having an absolutely low rental bandwidth.

In addition, when most wireless environments are operated on a circuit-based basis rather than on a packet basis, the price of the user depends mainly on the circuit usage time, thereby reducing the amount of transmission between the server and the terminal in a low-bandwidth wireless communication environment. It is essential.

In addition, the terminal solution for the wireless Internet is largely a voice-oriented terminal including a smart phone that supports WAP (wireless application protocol), mini-notebook, handheld PC (HPC) / personal digital (PDA) A general wireless telephone terminal or a wireless modem is connected to an assistant, and a wireless modem is built in the PDA to directly access the wireless Internet.

Currently, most wireless Internet services are mainly based on the WAP or a corresponding solution, for example, NTT DoCoMo i-Mode. However, in the case of the WAP, a wireless mobile communication environment and a terminal with low network rental width are available. It is a solution for overcoming constraints such as screen size, charger capacity, and processing capacity of a terminal, and is basically recognized as a solution suitable for the service of text information based on short sentences (within 5 to 7 lines).

However, since most Internet services are built on HTML and serve multimedia information such as images and videos, not simple text-based ones, there is a necessity to service existing HTML-based information even in the case of wireless Internet. It is becoming.

In addition, recently, next-generation terminals, which have greatly improved performance in terms of screen size and processing capacity of terminals, are emerging, and the base environment for wireless Internet service is supported. Will be able to. In particular, it is essential to reduce the absolute amount of communication by compression in order to support the existing Internet service that has a lot of information and supports multimedia such as images in a wireless environment.

Therefore, the present inventors automatically check the user's usage environment to determine whether the communication contents between the web browser and the proxy server are compressed, and if the terminal environment can perform the compression / decompression function, the compressed contents are transmitted. It is about developing a proxy server solution that can be sent in the normal format to support all standard web browsers.

An object of the present invention is to provide a proxy server solution that adds a compression function to the wired / wireless based web proxy server to solve the problems described above, so that the proxy server and the web without changing the conventional wired / wireless communication environment and web browser It is to provide a proxy server solution that can compress and transmit data between browsers.

Another object of the present invention is to provide a proxy server solution that can reduce a request latency time of a client by obtaining a previously requested content from the cache memory of the proxy server instead of an external server.

Still another object of the present invention is to perform a function as a general-purpose web proxy server by performing a function of a general Internet web proxy server as a whole, such as a cache for the content requested once on behalf of a request to a web server. By adding the compression function, the user's environment is automatically checked to determine whether the communication contents between the web browser and the proxy server are compressed. If the terminal environment can perform the compression / decompression function, the compressed content is transmitted. Is intended to provide a proxy server solution that can be sent in the normal format to support all standard web browsers.

It is still another object of the present invention to provide a proxy server solution that can reduce network traffic that is applied to a network causing connection delay.

Yet another object of the present invention is to provide a proxy server solution that can reduce the load on a web server.

Still another object of the present invention is to provide a proxy server solution capable of providing a service of multimedia information such as an image and a video based on HTML on which an Internet service is currently based.

The above and other objects of the present invention can all be achieved by the present invention described below.

1 illustrates a schematic configuration of a mobile web proxy server according to the present invention.

2 schematically illustrates an operating environment for practicing the present invention.

Figure 3 illustrates a schematic internet environment including a conventional web proxy server.

4 shows a hierarchy of TCP levels.

5 is a flowchart illustrating an operation process of the present invention according to a terminal having a compression module.

5A is a flowchart illustrating an operation process of the present invention according to a terminal without a compression module.

* Brief description of the major symbols in the drawings *

1: User terminal 1: Wireless PDA

1 ＇＇: Mobile PC 2: Mobile Web Proxy Server

3: HTTP server 4: cache memory

5: wireless network 6: wired Internet

Summary of the Invention

In a web proxy server according to the present invention, a method for compressing and transmitting transmission data includes: requesting a search for the web from a terminal; Determining whether the compressed data can be transmitted by determining the type of the terminal; The proxy server receives the search request and determines whether to process the search request according to a security and filtering policy; In the determination, if the search request is suitable for the security and filtering policy, the proxy server searches the cache memory to determine whether the request data is stored, and if the search request is not suitable for the security and filtering policy. If it stops searching; In the determination, if the request data is stored in the cache memory, the request data is output from the cache memory. If there is no request data in the cache memory, the proxy server accesses the requested web. Output the request data; The proxy server compresses the output request data and transmits the output request data to the terminal; The compression module of the terminal decompresses the transmitted request data, inputs the data into a web browser, displays the data, and the proxy server stores the request data in the cache memory. Consists of steps.

Detailed description of the invention

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

2 schematically illustrates an operating environment for practicing the present invention.

The overall operating environment of the present invention is a user terminal (1), a general-purpose mobile web proxy server (2) having a compression function according to the present invention, an HTTP server (3), an external server, a mobile communication-based wireless network as shown (5), a wired internet network 6 and an external proxy server 7 connecting the web proxy server 2 and the external HTTP server 3.

The user terminal 1 is a wireless personal digital assistant (1 ＇) with a built-in wireless personal digital assistant (1＇), which is a terminal that supports a standard HTML web browser in a wireless environment, and an external wireless communication module, a mobile terminal (notebook, general PDA, A mobile PC (1 ＂) consisting of a Hand Held PC and the like.

The mobile web proxy server 2 caches the request contents in the storage space of the proxy server 2 while acting as a request for the external HTTP server 3 from the user terminal 1.

The cache refers to a series of data processing processes for temporarily storing data. For example, a web page requested by a user is stored in a cache directory on the hard disk. In this way, when the user returns to a recently opened page, the browser gets the data from the cache instead of retrieving the information from the original server to save time and offload the network. Computers also maintain several caches, depending on their level of operation, such as cache memory or disk cache. Caches can also be implemented for Internet information by distributing the same information across multiple servers and periodically updating them.

The proxy server 2 provides a service for the same content thereafter to the web browser directly from the proxy server 2 instead of the external HTTP server 3 to reduce the request latency time of the web browser and to the outside. To reduce network traffic. In addition, it is located between the web browser and the HTTP server (3) not only performs the function of the conventional web proxy server, but also performs a compression function in order to reduce the amount of transmission and time in a wireless network environment of a low bandwidth. By performing all functions of general web proxy server, it can be used as general-purpose web proxy server in general wired and wireless environment.

The HTTP server 3 refers to a web server that stores information requested by an actual user.

Wireless network (5) refers to a wireless data communication network, which digitizes data and then spreads the data over the entire available bandwidth so that multiple calls overlap on one channel, with each call given a unique code indicating the sequence In the case of Code-Division Multiple Access (CDMA), which means a scheme, it means a wireless network supporting IS-95A / B / C.

In the case of Global System for Mobile communication (GSM), which also digitizes and compresses the data and sends it along with two other user data over one channel, each of which is sent in its own time zone. Means a communication network supporting GPRS.

The wireless communication network widely used up to now only supports a low network rental width, and in an environment such as the IS-95A / B of the CDMA, only a circuit communication is supported, thereby deteriorating stability for a long time.

The wired Internet network 6 is a general Internet network connecting the mobile web proxy server 2, the HTTP server 3 existing on the Internet, and the external web proxy server 7 to generally perform packet communication. It can help you stay connected all the time.

The packet refers to a binary number or group of bits including data and a call control signal. In particular, when transmitting data in packet communication, the packet is decomposed and transmitted into a basic transmission unit called a packet, and then reassembled into original data. Refers to the processing of data to be processed.

The external web proxy server 7 is a web proxy server other than the mobile web proxy server 2 and means a conventional web proxy server that performs a proxy function for a web server storing information requested by an actual user. Since the web proxy server 7 has been described in detail in the background of the present invention, it will be omitted here.

As described above, the mobile web proxy server 2 may serve as a general web browser for all web browsers supporting standard HTML browsing, for example, Microsoft Internet Explorer, Netscape Navigator, and the like. In particular, it can play a role as a solution for a wireless Internet environment in which transmission speed and long-term stability of the connection are key issues.

1 illustrates a schematic configuration of a mobile web proxy server according to the present invention. The compression module 2 'compresses the request data transmitted from the external HTTP server 3, delivers the compressed request data to the user terminal 1, and releases the compressed request data in the original format.

The compression module is implemented in a socket library, which is an interface of a web browser to a TCP layer that is responsible for information transfer between terminals on an internet communication protocol in order not to change a conventional web browser. do.

The TCP hierarchical structure is illustrated in FIG. 4, and a socket library API (application program interface) is a language or message used when an application program communicates with a system program such as an operating system or a database management system. Say the format.

Transmission Control Protocol / Internet Protocol (TCP / IP) is a communication protocol that can connect networks with different physical properties.

By implementing the decompression function in the socket library, it decompresses the content transmitted from the server and delivers it to the web browser, which is an application program, to guarantee the transparency of the compression to the web browser, and the compression algorithm is basically We apply open compression algorithm such as LZW (Lempel Ziv Welch).

In the method of realizing compression in the socket library, a person having ordinary knowledge in the art can easily realize the detailed description thereof.

As shown in Fig. 2, the mobile terminal 1 can be classified into a wireless PDA 1 'with a compression module and a mobile PC 1' without a compression module. A terminal in which a network module (Socket Library and TCP Module) including a compression module according to the present invention is installed, means a terminal capable of receiving compressed content from a mobile web proxy server according to the present invention.

The mobile PC 1 'is not a network module according to the present invention, but a terminal using a network module which is conventionally used, and receives information in a normal format without compressing the information in the mobile web proxy server. Even in the case of the mobile PC (1), it is possible to obtain advantages such as a reduction in latency time, which is an advantage of using a general web proxy server.

The proxy server 2 is basically a special-purpose HTTP server that acts on behalf of a web browser request, and the proxy server 2 further reduces the absolute network traffic by adding a compression function in addition to the function of a general web proxy server. Allows you to perform a function.

The proxy server 2 accesses an external web server on behalf of the web browser when the internal user requests the content on the external web server, and searches for the request content. The URL (Uniform Resource Locator) requested by the user or the web server and IP Performs optional checks of specific requests, acting on the basis of addresses. In addition, the user once requested contents are stored in the cache memory (4) of the local HDD (Hard Disk Drive) to deliver the contents of the cache memory (4) without accessing an external web server when there is a request for the next same content. By reducing the response time (Latency Time) of the user.

In addition, when delivering the contents transmitted from the external server or the contents stored in the cache memory to the user, the user terminal performs the function of compressing and transmitting the contents in the case of the terminal including the compression module to secure the transmission time and stability by reducing the absolute traffic volume. Do it.

The cache memory is a space installed in a local storage device of a mobile web proxy server. The cache memory is taken from an external HTTP server that stores user requests, and is temporarily stored in the cache memory. It is a storage space required to be able to service users without accessing the server. According to the cache policy, the web proxy server can set the cache memory capacity and storage cycle according to the situation.

Hereinafter, the operation state of the mobile web proxy server according to the present invention will be described with reference to FIG. 1.

When the mobile terminal 1 makes a request for the web, the proxy server 2 determines the type of the mobile terminal 1 of the user to determine whether to transmit the compressed content. In the case of the terminal 1 'with the compression module, if the mobile terminal 1 makes a web site search request, the proxy server 2 receives the request and applies the security and filtering policy. It is determined whether or not to process.

The security refers to a main security protocol capable of encrypting and decrypting a message, such as Secure Sockets Layer (SSL), in order to prevent a third party from randomly changing the message. The security protocols include SSL and SHTTP (Secure). Hypertext Transfer Protocol (IPSec), Internet Protocol Security Protocol (IPSec), and the like.

The filtering policy is a sequence of steps for testing each input or output request for any suitable criteria, processing it appropriately, and then forwarding it.

In the judgment, if it is a request to be processed, it is checked whether the request data exists in the cache memory 4, and if there is no request, it connects to the corresponding HTTP server 3 and outputs the request data, and the request data is the cache. In the case of the memory 4, the cache memory 4 is accessed and the result is compressed and delivered to the user.

The compression module in the user terminal 1 'decompresses the compression result and delivers it to the web browser. At the same time, the results obtained from the web server 5 are stored in the cache memory 4 in a compressed or original format for future reuse.

The cache memory 4 is a memory that a microprocessor can access faster than a general RAM.

In the case of a terminal 1 ″ without a compression module, when the website 1 ″ is requested by the terminal 1 ″, the proxy server 2 receives the request and processes the request according to a security and filtering policy. You will be judged.

If the request is to be processed in the determination, it is determined whether the request is in the cache memory, and if there is no request, the web server is approached to obtain a result, and if the request is in the cache memory 4, the cache is obtained. The result of accessing the memory 4 is obtained and the compressed contents are decompressed and delivered to the web browser in its original format without being compressed to the user. At the same time, the results obtained from the web server are stored in the cache memory 4 in compressed or original format for future reuse.

Referring to the flow of the above-described operation process in a flow chart, in the case of a terminal having a compression module, as shown in FIG. 5, the terminal makes a search request for the web (S1) and determines the type of the terminal. It is determined whether the compressed data can be transmitted (S2), and whether or not the search request has been processed according to security and filtering policies (S3). If the search request is a suitable search request, the proxy server may determine a cache memory. The search determines whether there is the corresponding request data, and if it is inappropriate, the search is stopped (S4). If the request data is stored in the cache memory, the request data is outputted. If there is no request data, the proxy server accesses the requested web and requests data. (S5), the proxy server compresses the outputted request data and transmits it to the terminal (S6), and the compression module of the terminal decompresses the transmitted request data and inputs the data into a web browser. Displaying and storing the request data in the cache memory.

In the case of a terminal without a compression module, as shown in FIG. 5A, the request data is output from the above-described cache memory. If there is no request data in the cache memory, the proxy server sends a request to the requested web. In step S5 of accessing and outputting request data, it is determined whether or not the request data is compressed (S6). If the request data is compressed, the compressed request data is decompressed to decompress the web. If the request data is not compressed, the request data is transmitted to a browser for display. If the request data is not compressed, the request data in the original format is transmitted to the web browser for display. The proxy server compresses the request data output by accessing the web server. Or store it in cache memory in a circular manner (S7 ＇). It is broken.

The present invention provides a mobile web proxy server solution having a compression function as a method for securing the speed and stability of the Internet service in a wireless communication environment, thereby reducing the absolute amount of communication between the user terminal and the web server in a wireless communication environment. It is effective to reduce the cost and reduce the cutting phenomenon during long time communication. In general, in case of text-based information, the compression can be reduced by 10 times by performing compression on average. In addition, by providing a network module-based compression module, it can be used as a general-purpose web proxy server solution by supporting a standard web browser that supports existing HTML without modification. Even in the limited network rental environment of the current wireless communication, it is possible to enable the HTML-based wireless Internet service, rather than the limited format-based wireless Internet service such as WAP or C-HTML, and also have the Internet service including multimedia such as images and videos. .

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (4)

Making a search request for the web at the terminal; Determining whether the compressed data can be transmitted by determining the type of the terminal; The proxy server receives the search request and determines whether to process the search request according to a security and filtering policy; In the determination, if the search request is suitable for the security and filtering policy, the proxy server searches the cache memory to determine whether the request data is stored, and if the search request is not suitable for the security and filtering policy. Will stop searching; In the determination, if the request data is stored in the cache memory, the request data is output from the cache memory. If there is no request data in the cache memory, the proxy server accesses the requested web. Output the request data; The proxy server compresses the output request data and transmits the output request data to the terminal; And The compression module of the terminal decompresses the transmitted request data, inputs the data into a web browser, displays the data, and the proxy server stores the request data in the cache memory. Web proxy solution with compression in steps. Making a search request for the web at the terminal; Determining whether the compressed data can be transmitted by determining the type of the terminal; The proxy server receives the search request and determines whether to process the search request according to a security and filtering policy; In the determination, if the search request is suitable for the security and filtering policy, the proxy server searches the cache memory to determine whether the request data is stored, and if the search request is not suitable for the security and filtering policy. If it stops searching; In the determination, if the request data is stored in the cache memory, the request data is output from the cache memory. If there is no request data in the cache memory, the proxy server accesses the requested web. Output the request data; Determine whether the request data is compressed; And In the determination, if the request data is compressed, the compressed request data is decompressed and transmitted to the web browser for display. If the request data is not compressed, the request data in the original format is displayed on the web. Transmits to a browser for display and the proxy server stores the request data output by accessing the web server in a cache memory; Web proxy solution with compression in steps. The web proxy solution of claim 1 or 2, wherein the storing of the request data in the cache memory compresses and stores the request data. The web proxy solution of claim 1 or 2, wherein the compression module is implemented at a socket library API (Application Program Interface) level of the TCP hierarchy.