Electrical computers and digital processing systems: multicomput – Multicomputer data transferring via shared memory
Reexamination Certificate
2000-11-08
2004-09-21
Geckil, Mehmet B. (Department: 2142)
Electrical computers and digital processing systems: multicomput
Multicomputer data transferring via shared memory
C709S203000, C709S201000
Reexamination Certificate
active
06795848
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication system, and is more particularly related to retrieving web content using proxy servers.
2. Discussion of the Background
As businesses and society, in general, become increasingly reliant on communication networks to conduct a variety of activities, ranging from business transactions to personal entertainment, these communication networks continue to experience greater and greater delay, stemming in part from traffic congestion and network latency. For example, the maturity of electronic commerce and acceptance of the Internet, in particular the World Wide Web (“Web”), as a daily tool pose an enormous challenge to communication engineers to develop techniques to reduce network latency and user response times. With the advances in processing power of desktop computers, the average user has grown accustomed to sophisticated applications (e.g., streaming video, radio broadcasts, video games, etc.), which place tremendous strain on network resources. The Web as well as other Internet services rely on protocols and networking architectures that offer great flexibility and robustness; however, such infrastructure may be inefficient in transporting Web traffic, which can result in large user response time, particularly if the traffic has to traverse an intermediary network with a relatively large latency (e.g., a satellite network).
FIG. 6
is a diagram of a conventional communication system for providing retrieval of web content by a personal computer (PC). PC
601
is loaded with a web browser
603
to access the web pages that are resident on web server
605
; collectively the web pages and web server
605
denote a “web site.” PC
603
connects to a wide area network (WAN)
607
, which is linked to the Internet
609
. The above arrangement is typical of a business environment, whereby the PC
601
is networked to the Internet
609
. A residential user, in contrast, normally has a dial-up connection (not shown) to the Internet
609
for access to the Web. The phenomenal growth of the Web is attributable to the ease and standardized manner of “creating” a web page, which can possess textual, audio, and video content.
Web pages are formatted according to the Hypertext Markup Language (HTML) standard which provides for the display of high-quality text (including control over the location, size, color and font for the text), the display of graphics within the page and the “linking” from one page to another, possibly stored on a different web server. Each HTML document, graphic image, video clip or other individual piece of content is identified, that is, addressed, by an Internet address, referred to as a Uniform Resource Locator (URL). As used herein, a “URL” may refer to an address of an individual piece of web content (HTML document, image, sound-clip, video-clip, etc.) or the individual piece of content addressed by the URL. When a distinction is required, the term “URL address” refers to the URL itself while the terms “web content”, “URL content” or “URL object” refers to the content addressed by the URL.
In a typical transaction, the user enters or specifies a URL to the web browser
603
, which in turn requests a URL from the web server
605
. The web server
605
returns an HTML page, which contains numerous embedded objects (i.e., web content), to the web browser
603
. Upon receiving the HTML page, the web browser
603
parses the page to retrieve each embedded object. The retrieval process often requires the establishment of separate communication sessions (e.g., TCP (Transmission Control Protocol) sessions) to the web server
605
. That is, after an embedded object is received, the TCP session is torn down and another TCP session is established for the next object. Given the richness of the content of web pages, it is not uncommon for a web page to possess over 30 embedded objects. This arrangement disadvantageously consumes network resources, but more significantly, introduces delay to the user.
Delay is further increased if the WAN
607
is a satellite network, as the network latency of the satellite network is conventionally a longer latency than terrestrial networks. In addition, because HTTP utilizes a separate TCP connection for each transaction, the large number of transactions amplifies the network latency. Further, the manner in which frames are created and images are embedded in HTML requires a separate HTTP transaction for every frame and URL compounds the delay.
Based on the foregoing, there is a clear need for improved approaches for retrieval of web content within a communication system.
There is a need to utilize standard protocols to avoid development costs and provide rapid industry acceptance.
There is also a need for a web content retrieval mechanism that makes the networks with relatively large latency viable and/or competitive for Internet access.
Therefore, an approach for retrieving web content that reduces user response times is highly desirable.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a communication system for retrieving web content comprises a downstream proxy server that is configured to receive a URL request message from a web browser. The URL request message specifies a URL content that has an embedded object. An upstream proxy server is configured to communicate with the downstream proxy server and to receive the URL request message from the downstream proxy server. The upstream proxy server selectively forwards the URL request message to a web server and receives the URL content from the web server, wherein the upstream proxy server forwards the URL content to the downstream proxy server and parses the URL content to obtain the embedded object prior to the web browser having to issue an embedded object request message. The above arrangement advantageously reduces user response time associated with web browsing.
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Border John
Butehorn Matt
Dillon Douglas
Geckil Mehmet B.
Hughes Electronics Corporation
Whelan John T.
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