JP5602678B2 - WEB information prefetching method and prefetching proxy server device - Google Patents

Description

  In the present invention, when a WEB browsing apparatus (for example, a personal computer or a portable terminal, hereinafter referred to as “PC”) acquires WEB information (WEB content information) from a WEB server on the network, The connected prefetch proxy server prefetches WEB information predicted to be requested by the PC from an HTML (HyperText Markup Language) file in the WEB information transmitted from the WEB server based on the PC request, and requests the PC. The present invention relates to a WEB information prefetching method and a prefetch proxy server device for transferring the WEB information to a PC.

  When a PC browses WEB information from a WEB server on a network such as the Internet, the WEB server transmits WEB information to the PC using HTML or the like according to an HTTP (Hypertext Transfer Protocol) communication protocol. For example, when the HTML file index.html provided by the WEB server called byte.tokkyo.co.jp is acquired by HTTP, the WEB information is read at the address http://byte.tokkyo.co.jp/index.html. Can do. When reading WEB information from a WEB server, a user generally specifies and reads an address using a program (hereinafter referred to as “browser”) for browsing the WEB information on a PC. In the PC, when the user inputs an address, the browser transmits a page request to the WEB server. The WEB server receives this page request via the network, and transmits the WEB information of the requested page to the PC via the network. In this way, each time a page request is received from the user, the browser of the PC acquires the corresponding page via the network.

  In recent years, there has been a demand for shortening the time from when a PC user requests acquisition of WEB information to when the WEB information is given to the PC. In response to this, Non-Patent Document 1, Patent Document 1, Patent Document 2, and Patent Document 3 disclose a technique for prefetching WEB information.

  FIG. 6 shows a conventional WEB information prefetching processing sequence. Here, the request data for the PC to browse the WEB information data1 and data2 of the WEB server is set to get1 and get2. The WEB server outputs WEB information data1 and data2 according to the request data get1 and get2. It is assumed that data1 is an HTML file and includes a link to data data2 requested by the PC. The PC receives and analyzes the HTML file, extracts a link to data2, generates request data get2, and transmits the request data to the WEB server.

  In FIG. 6, the PC transmits request data get1 to the WEB server. The prefetching proxy server located between the PC and the WEB server extracts and stores get1, and transfers get1 to the WEB server.

  The WEB server transmits WEB information data1 (HTML file) corresponding to get1 to the PC. Since the prefetching proxy server has received get1 corresponding to data1 from the PC, it transfers data1 to the PC. Further, the prefetch proxy server analyzes data1 (HTML file), generates request data get2 that is predicted to be requested when the PC receives this data1 (prefetch), transmits it to the WEB server, and stores it.

  The WEB server transmits WEB information data2 corresponding to the prefetch request data get2 to the prefetch proxy server. Since the prefetching proxy server has not received get2 corresponding to the prefetched data2 from the PC, the prefetching proxy server temporarily accumulates data2.

  On the other hand, the PC receives data1, generates get2 from data1, and transmits it to the WEB server. When the prefetch proxy server receives this get2, it compares it with the accumulated request data. Here, since the prefetching proxy server has already accumulated the prefetch request data get2, it is determined that data2 corresponding to get2 has already been prefetched, and data2 is accumulated without transferring get2 to the WEB server. Check if it is. Here, since the prefetching proxy server has already accumulated data2, it transfers data2 corresponding to get2 to the PC.

  Thus, before the request data transmitted by the PC arrives, the WEB server receives the prefetch request data from the prefetch proxy server, correspondingly transmits the WEB information to the prefetch proxy server, and the PC transmits the WEB information. Is obtained from the prefetching proxy server, and the acquisition time of the WEB information is shortened.

FIG. 7 shows a configuration example of a conventional prefetch proxy server device.
In FIG. 7, the network interface unit 21 distributes the received signal to the request data receiving unit 22 or the WEB information analyzing unit 26 according to the transmission source and destination of the received signal. The request data receiving unit 22 receives a signal transferred from the PC to the WEB server, extracts request data (get) from the received signal, and outputs it to the request data comparing unit 23.

  The request data comparison unit 23 inquires whether the request data extracted by the request data receiving unit 22 is stored in the request data storage unit 24, and the request data requesting the same WEB information is stored in the request data storage unit 24. If not (get 1 in FIG. 6), the request data is output to the request data transmission unit 25 and stored in the request data storage unit 24. If the request data extracted by the request data receiving unit 22 is stored in the request data storage unit 24 as prefetch request data (get 2 in FIG. 6), the prefetch request data is stored in the WEB information storage unit 28. Inquire whether or not the WEB information (data2) is stored, and if it has been stored, instruct it to transmit it to the PC at that time.

  The request data transmission unit 25 transfers the request data input from the request data comparison unit 23 to the WEB server via the network interface unit 21.

  The WEB information analysis unit 26 receives the WEB information transmitted by the WEB server according to the request data, extracts the request data for the WEB information (get1 for data1), and outputs it to the WEB information storage unit 28 together with the WEB information. Further, if the WEB information is an HTML file, request data (get 2) predicted to be requested next by the PC that receives the WEB information is generated (pre-read) and output to the pre-read request data comparison unit 27.

  The WEB information storage unit 28 inquires whether request data for the WEB information is stored in the request data storage unit 24. If the request data is stored, the WEB information storage unit 28 outputs the WEB information to the WEB information transmission unit 29. If it has not been accumulated, the process stands by. Further, the WEB information storage unit 28 outputs the WEB information (data 2 for get 2) for the pre-read request data to the WEB information transmission unit 29 according to the instruction of the request data comparison unit 23.

  The WEB information transmission unit 29 transmits the WEB information input from the WEB information storage unit 28 to the PC via the network interface unit 21.

  The prefetch request data comparison unit 27 inquires whether the prefetch request data (get2) generated by the WEB information analysis unit 26 is stored in the request data storage unit 24, and request data requesting the same WEB information is requested. If not stored in the data storage unit 24, the prefetch request data is output to the request data transmission unit 25 and stored in the request data storage unit 24. When the prefetch request data generated by the WEB information analysis unit 26 is stored in the request data storage unit 24, the corresponding web information has already been prefetched, so the prefetch request data is not output.

  The request data sending unit 25 transfers the prefetch request data (get 2) input from the prefetch request data comparison unit 27 to the WEB server via the network interface unit 21.

FIG. 8 shows a processing procedure of a conventional prefetching proxy server device.
In FIG. 8, the prefetching proxy server confirms the transmission source and destination of the received signal (S11). If the transmission source of the received signal is a PC and the destination is a WEB server, request data is extracted from the received signal (S12). Next, it is determined whether or not the extracted request data exists in the request data storage unit 24 (S13). If the request data does not exist (get1 in FIG. 6) (S13: No), the request data is received from the PC. The request data is transmitted to the WEB server and stored in the request data storage unit 24 (S14). On the other hand, when the request data exists in the request data storage unit 24 (get2 in FIG. 6) (S13: Yes), the corresponding data is not transmitted to the WEB server, but the corresponding WEB information (data2 for get2). Is transmitted to the PC (S15).

  When the transmission source of the received signal is the WEB server and the destination is the PC, the request data for the received WEB information (get1 for data1 and get2 for data2 in FIG. 6) is extracted (S16), and the request data for the WEB information is the request data. It is determined whether or not it exists in the storage unit 24 (S17). If the request data exists (S17: Yes), the WEB information is transmitted to the PC (S18). Further, it is determined whether or not the WEB information is an HTML file (S19), and if it is an HTML file (S19: Yes), request data predicted to be requested by the PC that receives the WEB information (get2 for data1 in FIG. 6). ) Is generated (prefetched) (S20). Next, it is determined whether or not the prefetch request data (get2) exists in the request data storage unit 24 (S21). If the prefetch request data does not exist (S21: No), the prefetch request is requested. The data is transmitted to the WEB server and stored in the request data storage unit 24 (S22). On the other hand, if the WEB information is not an HTML file (S19: No), the process is terminated, and if the prefetch request data exists in the request data storage unit 24 (S21: Yes), the corresponding WEB information is already prefetched. Therefore, the process is terminated.

JP 2000-132481 A JP 2001-142769 A JP 2011-039899 A

Paper NAIST-MT351067 ("Proposal for Speeding Up Information Acquisition on WWW" Kenichi Chinen, Nara Institute of Science and Technology, Graduate School of Information Science, submitted on February 20, 1995)

  Generally, request data (get) for acquiring WEB information (data) is generated by a browser installed in each device. The request data generated by the browser is added with an HTTP request header corresponding to the environment set in the browser. Therefore, if the browsers mounted on the PC and the prefetching proxy server are different, for example, in FIG. 5, the header of the request data get2 generated by the PC and the prefetching request data get2 that the prefetching proxy server extracts from the WEB information (HTML file). May have different headers. In this case, for example, if the request data is in different languages (for example, the Accept-Language of the HTTP request header is different), the WEB server responds to each request data with WEB information corresponding to the different languages. Then, if the WEB information data2 prefetched by the prefetching proxy server is directly responded to the PC, there is a problem that characters are garbled on the browser of the PC.

  In addition, if the cookie information included in the request data from the PC and the cookie information included in the WEB information (HTML file) from the WEB server are different in the prefetch proxy server, the user mismatch between the WEB information received by the PC from the prefetch proxy server For example, in a shopping site, there is a problem that a user name is displayed differently.

  Further, when the prefetching proxy server makes a prefetch request to the WEB server, conventionally, the order of CSS (cascading style sheet), JS (javascript), and IMG (image) has not been considered. Therefore, for example, when the IMG file arrives before the CSS file arrives at the prefetching proxy server and is transferred to the PC in that order, there is a problem that the layout is broken and displayed on the browser of the PC.

  The present invention provides a WEB information prefetching method and a prefetching proxy server device capable of solving the problem of garbled and distorted layout of WEB information due to a difference in browser between a PC and a prefetching proxy server, and a problem of user inconsistency due to a difference in cookie information. The purpose is to do.

  A first invention is a WEB information prefetching method using a prefetch proxy server connected between a WEB server and a WEB browsing device via a network system, wherein the prefetch proxy server is transmitted from the WEB browsing device. Is transferred to the WEB server, header information is extracted from the first request data, WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, and The second request data is generated from the WEB information, the header information of the second request data is replaced with the header information extracted from the first request data, transmitted to the WEB server, and the second request data transmitted from the WEB server is transmitted. Receiving prefetched WEB information corresponding to the requested data and obtaining the WEB information corresponding to the first requested data Receiving the third request data transmitted from the WEB browsing device, and transfers the WEB information read ahead WEB browsing device when the second request data and the third request data match.

A second invention is a WEB information prefetching method using a prefetching proxy server connected between a WEB server and a WEB browsing device via a network system, wherein the prefetching proxy server is transmitted from the WEB browsing device. The request data is transferred to the WEB server, the user identification information is extracted from the first request data, the WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, The second request data is generated from the WEB information, and the user identification information included in the second request data and the user identification information extracted from the first request data are combined and transmitted to the WEB server. Receiving prefetched WEB information corresponding to the second request data transmitted from the server and corresponding to the first request data That receives the third request data transmitted to WEB information from WEB browsing device obtained, and transfers the WEB information read ahead WEB browsing device when the second request data and the third request data match.
In the WEB information prefetching method of the first invention or the second invention , the prefetching proxy server includes a link to a CSS (cascading style sheet) file obtained from the WEB information corresponding to the first request data, JS (Javascript) ) Second request data is generated in that order for the link to the file and the link to the IMG (image) file.

A third invention is a prefetch proxy server device that is connected between a WEB server and a WEB browsing device via a network system and transfers WEB information prefetched from the WEB server to the WEB browsing device, and is transmitted from the WEB browsing device. The first request data is transferred to the WEB server, header information is extracted from the first request data, and WEB information corresponding to the first request data transmitted from the WEB server is sent to the WEB server. The second request data is transferred to the browsing device, the second request data is generated from the WEB information, the header information of the second request data is replaced with the header information extracted from the first request data, and the second request data is transmitted to the WEB server. And receiving prefetched WEB information corresponding to the second request data transmitted from the WEB server, The third request data transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the one request data is received, and when the second request data and the third request data match, the pre-read WEB information is And a third means for transferring to the browsing device.

A fourth invention is a prefetch proxy server device that is connected between a WEB server and a WEB browsing device via a network system and transfers WEB information prefetched from the WEB server to the WEB browsing device, and is transmitted from the WEB browsing device. The first request data is transferred to the WEB server, the user identification information is extracted from the first request data, and the WEB information corresponding to the first request data transmitted from the WEB server is transmitted. The second request data is generated from the WEB information, and the user identification information included in the second request data is combined with the user identification information extracted from the first request data. A second means for transmitting to the WEB server, and a prefetched WEB corresponding to the second request data transmitted from the WEB server When the third request data transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the first request data is received and the second request data matches the third request data And a third procedure for transferring the pre-read WEB information to the WEB browsing apparatus.
In the prefetching proxy server device of the third or fourth invention , the second means is a link to a CSS (cascading style sheet) file obtained from WEB information corresponding to the first request data, JS (Java The second request data is generated in the order of the link to the script) file and the link to the IMG (image) file.

  The present invention can eliminate the difference in request data caused by the difference between the browser of the WEB browsing device (PC) and the prefetching proxy server, and can avoid garbled characters in the prefetched WEB information.

  In addition, by generating the pre-read request data in the order of CSS, JS, and IMG and reading the WEB information, the order of reaching the WEB browsing apparatus (PC) is also the same, and the layout of the WEB information can be prevented from being corrupted. it can.

  Also, by generating the prefetch request data by combining the user identification information of the price included in the request data from the WEB browsing device (PC) and the second user identification information included in the WEB information from the WEB server. Thus, it is possible to provide stateful WEB information by matching user identification information.

It is a figure which shows the structural example of the prefetch proxy server apparatus of this invention. It is a figure which shows the processing sequence of the WEB information prefetch of this invention. It is a flowchart which shows the process sequence of the prefetch proxy server apparatus of this invention. It is a figure which shows the system structural example using an information storage server. It is a figure which shows the processing sequence of the WEB information prefetch using an information storage server. It is a figure which shows the processing sequence of the conventional web information prefetch. It is a figure which shows the structural example of the conventional prefetching proxy server apparatus. It is a flowchart which shows the process sequence of the conventional prefetch proxy server apparatus. It is a figure which shows the example of replacement of the prefetch HTTP request header. It is a figure which shows the example of cookie coupling | bonding of the prefetch HTTP request header.

FIG. 1 shows a configuration example of a prefetching proxy server device according to the present invention.
In FIG. 1, the prefetching proxy server newly includes a header extraction unit 11 and a header replacement unit 12 in addition to each unit having the same function as that of the conventional configuration. Here, in the conventional prefetching proxy server device shown in FIG. 6, only the part related to the processing of request data is shown, and the WEB information storage unit 28 and the WEB information transmission unit 29 are omitted.

  The network interface unit 21 distributes the received signal to the request data receiving unit 22 or the WEB information analyzing unit 26 according to the transmission source and destination of the received signal. The request data receiving unit 22 receives a signal transferred from the PC to the WEB server, extracts request data from the received signal, and outputs the request data to the request data comparison unit 23 and the header extraction unit 11.

  The header extraction unit 11 extracts an HTTP request header from the request data. In the HTTP request header, header information depending on the browser such as User-Agent, accept, accept-language, accept-encoding, accept-charset is stored. The header extraction unit 11 records the extracted HTTP request header by linking the WEB server address and the PC address, and outputs them in response to a request from the header replacement unit 12. The header extraction unit 11 extracts cookie information (user identification information) from the HTTP request header, records it together, and outputs it in response to a request from the header replacement unit 12. Here, the cookie information is information used for user identification and the like, and includes information such as the version of the cookie being used and the user name registered in the PC.

  The request data comparison unit 23 inquires whether the request data extracted by the request data receiving unit 22 is stored in the request data storage unit 24, and the request data requesting the same WEB information is stored in the request data storage unit 24. If not (get 1 in FIG. 6), the request data is output to the request data transmission unit 25 and stored in the request data storage unit 24. If the request data extracted by the request data receiving unit 22 is stored in the request data storage unit 24 as prefetch request data (get2 in FIG. 6), the WEB information storage unit stores the WEB for the prefetch request data. If information (data2) is accumulated, a process of transferring to the PC is performed.

  The request data transmission unit 25 transfers the request data input from the request data comparison unit 23 to the WEB server via the network interface unit 21.

  The WEB information analysis unit 26 receives the WEB information transmitted by the WEB server in response to the request data, extracts the request data for the WEB information (get1 for data1), outputs it to the WEB information storage unit together with the WEB information, If the WEB information is an HTML file, request data (get2) predicted to be requested next by the PC that receives the WEB information is generated (prefetched) and output to the header replacing unit 12.

  At this time, the WEB information analysis unit 26 obtains the request data from the WEB information in the order of the link to the CSS file, the link to the JS file, and the link to the IMG file, generates request data in the order, and sends the request data to the header replacement unit 12. Output. Since the WEB screens are configured and displayed in the order on the browser, the request data is generated in the order in the prefetching proxy server, so that the order is maintained and the display of the WEB screen is prevented from being corrupted. The WEB information includes set-cookie information (user identification information), and the WEB information analysis unit 26 extracts the set-cookie information and outputs it to the header replacement unit 12.

  The header replacement unit 12 extracts the address of the WEB server and the address of the PC from the prefetch request data input from the WEB information analysis unit 26, acquires the HTTP request header part corresponding to the information from the header extraction unit 11, The HTTP request header of the prefetch request data is replaced with the HTTP request header acquired from the header extraction unit 11. This replacement process eliminates the difference in the request data caused by the difference between the browsers of the prefetching proxy server and the PC, so that the difference in the WEB information transmitted by the WEB server is also resolved. Garbled characters disappear. For example, as shown in FIG. 9, the portion of the third to seventh lines of the HTTP request header from the PC is used as the third to seventh lines of the HTTP request header of the prefetch request data.

  Further, the header replacement unit 12 extracts the cookie information of the HTTP request header extracted by the header extraction unit 11 and the WEB information by the WEB information analysis unit 26 and combines it with the set-cookie information included in the prefetch request data. As a result, the user identifier or the like in the cookie information included in the prefetch request data can be matched with that of the PC, and the problem of user mismatch can be avoided. For example, as shown in FIG. 10, the second line of the HTTP request header from the PC and the second line of the WEB information from the WEB server are used as the second line of the HTTP request header of the prefetch request data. .

  The prefetch request data comparison unit 27 inquires whether the prefetch request data (get2) processed by the header substitution unit 12 is accumulated in the request data accumulation unit 24, and the request data requesting the same WEB information is the request data. If not stored in the storage unit 24, the prefetch request data is output to the request data transmission unit 25 and stored in the request data storage unit 24. Further, when the pre-read request data is stored in the request data storage unit 24, since the corresponding WEB information has already been pre-read, the pre-read request data is not output.

  The request data transmission unit 25 transmits the prefetch request data (get 2) input from the prefetch request data comparison unit 27 to the WEB server via the network interface unit 21.

  Note that the prefetch proxy server can determine which request data is to be processed by, for example, setting a port number in advance. That is, the request data and WEB information including the set port number may be extracted by the network interface unit 21 and output to the request data receiving unit 22 or the WEB information analyzing unit 26.

FIG. 2 shows a processing sequence of WEB information prefetching according to the present invention.
Basically, it is the same as the conventional processing sequence shown in FIG. 6, but in the prefetching proxy server, the HTTP request header is extracted from the request data get1 from the PC, and the prefetch request is extracted from the WEB information from the WEB server. It is characterized in that the HTTP request header of data get2 is replaced from get1 to an HTTP request header. In addition, the processing related to cookie information, the setting of the order of CSS, JS, and IMG are performed as described above for the prefetch request data get2.

FIG. 3 shows a processing procedure of the prefetching proxy server of the present invention.
In FIG. 3, the prefetch proxy server confirms the transmission source and destination of the received signal (S11). If the transmission source of the received signal is a PC and the destination is a WEB server, request data is extracted from the received signal (S12). Next, the HTTP request header of the extracted request data is extracted and stored (S23). Also, the cookie information of the request data is extracted and stored. Next, it is determined whether or not the extracted request data exists in the request data storage unit 24 (S13). If the request data does not exist (S13: No), the request data from the PC is sent to the WEB server. The data is transmitted and stored in the request data storage unit 24 (S14). On the other hand, when the request data exists in the request data storage unit 24 (S13: Yes), the request data is not transmitted to the WEB server, but the pre-read WEB information corresponding to the request data (get2 in FIG. 2). Data2) is transmitted to the PC (S15).

  When the source of the received signal is the WEB server and the destination is the PC, the request data for the received WEB information (get1 for data1 and get2 for data2 in FIG. 2) is extracted (S16), and the request data for the WEB information is the request data. It is determined whether or not it exists in the storage unit 24 (S17). If the request data exists (S17: Yes), the WEB information is transmitted to the PC (S18). Further, it is determined whether or not the WEB information is an HTML file (S19), and if it is an HTML file (S19: Yes), request data predicted to be requested by the PC that receives the WEB information (get2 for data1 in FIG. 6). ) Is generated (prefetched) (S20). Also, set-cookie information is extracted from the received WEB information. Here, the HTTP request header is replaced with the prefetched request data (S24), and further processing relating to cookie information, setting of the order of CSS, JS, and IMG are performed.

  Next, it is determined whether or not the prefetch request data (get2) exists in the request data storage unit 24 (S21). If the prefetch request data does not exist (S21: No), the prefetch request is requested. The data is transmitted to the WEB server and stored in the request data storage unit 24 (S22). On the other hand, if the WEB information is not an HTML file (S19: No), the process is terminated, and if the prefetch request data exists in the request data storage unit 24 (S21: Yes), the corresponding WEB information is already prefetched. Therefore, the process is terminated.

  The present invention also provides a prefetch proxy in the network system configuration of Patent Document 3 having an information storage server connected between the prefetch proxy server and the PC when the network delay time between the PC and the prefetch proxy server is large. It can also be applied to servers.

FIG. 4 shows a system configuration example using an information storage server.
In FIG. 4, the WEB server 31 is connected to the Internet 32. A PC 33, which is an example of a WEB browsing apparatus, is connected to the Internet 32 via a LAN 34 and a high delay network 35. A gateway GW is arranged at a connection point of each network. Here, the high-delay network 35 is a so-called WAN (Wide Area Network) that interconnects remote computers using, for example, a broadband wireless system or a satellite line. A longer delay time than that of the LAN 34 occurs.

  The prefetch proxy server 20 is connected to a predetermined position on the WEB server 31 side from the high delay network 35, for example, the Internet 32 or between the Internet 32 and the high delay network 35. On the other hand, the information storage server 30 is connected to a LAN 34 to which the PC 33 is connected. That is, the time for the PC 33 to access each server becomes shorter in the order of the WEB server 31, the prefetching proxy server 20, and the information storage server 30.

  FIG. 5 shows a processing sequence of WEB information prefetching using the information storage server. Here, let the request data for the PC 33 to browse the WEB information data1 and data2 of the WEB server 31 be get1 and get2. The WEB server 31 outputs WEB information data1 and data2 according to the request data get1 and get2. It is assumed that data1 is an HTML file and includes request data get2 of data data2 requested by the PC 33.

  In FIG. 5, the PC 33 transmits request data get 1 to the WEB server 31. The information storage server 30 and the prefetching proxy server 20 extract and store get1 respectively, and transfer get1 toward the WEB server 31.

  The WEB server 31 transmits data1 (HTML file) corresponding to get1 to the PC 33. Since the prefetch proxy server 20 and the information storage server 30 store get1 corresponding to data1, the data1 is transferred to the PC 33 as it is. The prefetching proxy server 20 generates (prefetchs) get2, which is request data predicted to be requested next when the PC 33 receives this data1. Here, with respect to the prefetch request data get2, the above HTTP request header is replaced, and further processing for cookie information and further adjustment of the order of CSS, JS, and IMG are performed. Further, the prefetch proxy server 20 notifies the information storage server 30 of data including the prefetch request data get 2 (prefetch notification) and transmits the data to the WEB server 31. The information accumulation server 30 accumulates the prefetch request data get2 notified from the prefetch proxy server 20. Note that the prefetch request data notified by the prefetch proxy server 20 to the information storage server 30 does not have to be the request data itself transmitted by the prefetch proxy server 20, and only the URL indicating the request destination of the HTTP request is notified. Also good.

  The WEB server 31 transmits data2 corresponding to the prefetch request data get2 to the prefetch proxy server 20. The prefetch proxy server 20 transfers the prefetched data 2 to the information storage server 30. The information storage server 30 temporarily stores the prefetched data2 with respect to the prefetch request data get2.

  In the transfer from the prefetch proxy server 20 to the information storage server 30, generally, the TCP protocol is used, and highly reliable transmission is performed. However, when the transmission speed of the transmission path between the prefetching proxy server 20 and the information storage server 30 is remarkably slow or the delay is remarkably large, and the transfer speed is very small due to congestion control using the TCP protocol. There is a high possibility that the PC 33 transmits the original request data (get2) before the data acquired by prefetching arrives at the information storage server 30. Therefore, in such a case, the effect of prefetching becomes small.

  Therefore, in the transfer from the prefetch proxy server 20 to the information storage server 30, transfer is performed at high speed using the UDP protocol. By transferring using the UDP protocol, there is no congestion control, so that it is possible to transfer at a higher speed than when using the TCP protocol. As a result, the WEB information acquired by prefetching can be delivered to the information storage server 30 before the PC 33 transmits the original request data, and the prefetching effect can be enhanced.

  In this case, the prefetch proxy server 20 measures the round trip time by exchanging control packets with the information storage server 30 and uses the UDP protocol when the measured value exceeds the threshold value. Switch to the selected transfer. On the other hand, the information storage server 30 obtains the sequence number included in the UDP packet when the prefetched data arrives by UDP, and detects the UDP packet that has not arrived. A retransmission request for the number is transmitted to the prefetching proxy server 20. As described above, by combining the TCP / UDP switching by the round trip time and the retransmission control, it is possible to transfer information with high speed and high reliability.

  On the other hand, the PC 33 receives data 1, generates get 2 from data 1, and transmits it to the WEB server 31. When the information storage server 30 receives this get2, it compares it with the stored request data. Here, since the information storage server 30 has already stored the prefetch request data get2, it is determined that the data2 corresponding to get2 has already been prefetched, and without transmitting get2 to the WEB server 31, It is confirmed whether or not data2 is accumulated. Here, since the information storage server 30 has already stored data2 transferred from the prefetching proxy server 20, the information storage server 30 transmits data2 corresponding to get2 to the PC 33 and discards get2.

DESCRIPTION OF SYMBOLS 11 Header extraction part 12 Header substitution part 20 Prefetch proxy server 21 Network interface part 22 Request data receiving part 23 Request data comparison part 24 Request data storage part 25 Request data transmission part 26 WEB information analysis part 27 Prefetch request data comparison part 28 WEB information Storage section 29 WEB information sending section 30 Information storage server 31 WEB server 32 Internet 33 PC
34 LAN
35 High latency network

Claims (6)

In a WEB information prefetching method using a prefetch proxy server connected between a WEB server and a WEB browsing device via a network system,
The prefetch proxy server is
Transferring the first request data transmitted from the WEB browsing device to the WEB server, and extracting header information from the first request data;
WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, second request data is generated from the WEB information, and header information of the second request data Is replaced with the header information extracted from the first request data and sent to the WEB server,
The prefetched WEB information corresponding to the second request data transmitted from the WEB server is received, and the third information transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the first request data. A WEB information prefetching method comprising receiving request data and transferring the prefetched WEB information to the WEB browsing device when the second request data matches the third request data. In a WEB information prefetching method using a prefetch proxy server connected between a WEB server and a WEB browsing device via a network system,
The prefetch proxy server is
The first request data transmitted from the WEB browsing device is transferred to the WEB server, and user identification information is extracted from the first request data,
WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, and second request data is generated from the WEB information, and is included in the second request data. The user identification information and the user identification information extracted from the first request data are combined and transmitted to the WEB server,
The prefetched WEB information corresponding to the second request data transmitted from the WEB server is received, and the third information transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the first request data. A WEB information prefetching method comprising receiving request data and transferring the prefetched WEB information to the WEB browsing device when the second request data matches the third request data. In the WEB information prefetching method according to claim 1 or 2 ,
The prefetching proxy server links to a CSS (cascading style sheet) file acquired from WEB information corresponding to the first request data, a link to a JS (Javascript) file, and a link to an IMG (image) file. The WEB information prefetching method is characterized in that the second request data is generated in that order. In a prefetching proxy server device connected between a WEB server and a WEB browsing device via a network system and transferring WEB information prefetched from the WEB server to the WEB browsing device,
A first means for transferring the first request data transmitted from the WEB browsing device to the WEB server and extracting header information from the first request data;
WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, second request data is generated from the WEB information, and header information of the second request data Second means for replacing the header information extracted from the first request data with the WEB server,
The prefetched WEB information corresponding to the second request data transmitted from the WEB server is received, and the third information transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the first request data. And third means for receiving the request data and transferring the prefetched WEB information to the WEB browsing device when the second request data and the third request data match. Prefetch proxy server device. In a prefetching proxy server device connected between a WEB server and a WEB browsing device via a network system and transferring WEB information prefetched from the WEB server to the WEB browsing device,
A first means for transferring the first request data transmitted from the WEB browsing device to the WEB server and extracting user identification information from the first request data;
WEB information corresponding to the first request data transmitted from the WEB server is transferred to the WEB browsing device, and second request data is generated from the WEB information, and is included in the second request data. A second means for combining user identification information and user identification information extracted from the first request data and transmitting the combined information to the WEB server;
The prefetched WEB information corresponding to the second request data transmitted from the WEB server is received, and the third information transmitted from the WEB browsing apparatus that has acquired the WEB information corresponding to the first request data. A third procedure for receiving request data and transferring the prefetched WEB information to the WEB browsing device when the second request data and the third request data match. Prefetch proxy server device. In the prefetch proxy server device according to claim 4 or 5 ,
The second means includes a link to a CSS (cascading style sheet) file acquired from WEB information corresponding to the first request data, a link to a JS (javascript) file, and an IMG (image) file. The prefetch proxy server device characterized in that the second request data is generated in the order of links.

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