Interactive Web Architecture and Protocol

    Architecture

    Client

    Runs a normal web browser.

    Directs all requests to Proxy Cache.

    Proxy Cache

    Located via a low-latency link to client.

    Relays cache-miss requests to Presend Proxy.

    Informs Presend Proxy of cache hits.

    Proxy Presend

    Relays GET requests to Web Server and transmits responses to Proxy Cache.

    Harvests URLs from requested files and retrieves these files for Proxy Cache.

    GIVEs harvested files to Proxy Cache.

    Web Server

    Unaltered web server.

    Protocol

    Request Mechanism

1)    Client sends HTTP "GET x" request to Proxy Cache.

2a)    If "x" is not in the cache, Proxy Cache issues a "GET x" request to the Presend Proxy.

3a)    Presend Proxy issues a "GET x" request to the web server.

4a)    Presend Proxy receives "x" from Server and returns it to Proxy Cache

5a)    Proxy Cache returns "x" to Client.

2b)    If "x" is in the cache, Proxy Cache issues a "GOT x" request to the Presend Proxy.

3b)    Proxy Cache returns "x" to Client.

    Presend Mechanism

A)    Preload Proxy "GIVEs" harvested URLs to Proxy Cache for future requests.

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This page written and maintained by Amy S. Hughes.
Please mail me any problems with or comments about this page.
Last modified Oct 16, 1997.