Labels:text | screenshot | font | diagram | number | line OCR: CACHE OR CHECK Proxy Server receives a Web object request Object already in cache is the TTL expired? NO No Y Yes Retrieve object from master file Is the object changed? No Update object TTL Yes the object available? No Create negative Update cbject cache object cachet Yes. Is the object cacheable? No Return object to user Figure 3: Proxy Server checks its cache for requested data and returns it the client. If the data is unavailable or expired, the software retrieves the object from the Web, returns it to the user, and miserts it into the cache.
