Transparent Content Negotiation

Transparent Content Negotiation (TCN):



• In HTTP spec from start
• Not widely used
• Can be used to deploy new graphics formats:
• Variant list describes alternative formats:{"paper.html.en" 0.9 {type text/html} {language en}}, {"paper.html.fr" 0.7 {type text/html} {language fr}}

ACCEPT image/png image/gif GET logo

If client supports PNG and file.png exists, serve it else serve file.gif

<IMG SRC="logo">

HTML document

Request from client

Server logic

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