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Lectures notes for 2010 - KTH

Lectures notes for 2010 - KTH

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Client Caching<br />

Client can cache HTTP documents along with the date and time the document was<br />

fetched.<br />

If the document is cached, then the If-Modified-Since header can be sent to check<br />

if the document has changed since the copy was cached - thus saving a transfer -<br />

but costing a round trip time and some processing time. This is called a conditional<br />

GET.<br />

Maguire Hypertext Transfer Protocol (HTTP) 5: 44 of 77<br />

maguire@kth.se <strong>2010</strong>.03.21 Internetworking/Internetteknik

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