security considerations internet standards corrections standards syntax expressive formats protocols feature sets media content negotiation

negotiable resource transparent negotiation mediatype http variants headers http/1.1 content negotiation features

performance transparent negotiation user agents security protocols http quality factors privacy remote variant selection content negotiation

security considerations standards preferences feature set matching algorithm encoding feature sets media content negotiation predicates

client-server web services performance standards security protocols http caching content negotiation api

information exchange negotiation metadata performance mime standards security framework protocols authentication content negotiation

mime feature expressions standards media types content negotiation

email standards fax content negotiation messaging services

media feature tags feature parameters user agent sip capabilities standards track contact header content negotiation registration

security considerations email mime standards fax tiff interoperability content negotiation reliability protocol

request methods header fields http status codes semantics content caching content negotiation quality of service metadata