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Graphics Interchange Format  |  1998-02-10  |  60.4 KB  |  452x351  |  4-bit (16 colors)
   ocr: CACHEORCHECK Proxy Server eccives a Web object request Object Yes is the ITL expired? No already in cache No Yes 1 Retrieve object drom master fle No Update Is the object changed? object TTL Yes Is No. the objoct available? Create negative Update cbject cache. object cachet Yes Ist the object cacheable? No Return abject 10 user nigure 3: Proxy Server cbecks its cache for requested data ad retins it the dient, Iftbe data 1S wavaitable or expired, tbe software retrieves the object from the Web, returns nt to. the user, and inserts it into the. cache.