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Notes on “URI Schemes and Web Protocols” (Tag issue [ schemeProtocols49 ])

Notes on “URI Schemes and Web Protocols” (Tag issue [ schemeProtocols49 ]). Noah Mendelsohn Dec. 5, 2005. Status. First draft 16 June 2005 ( http://www.w3.org/2001/tag/doc/schemeProtocols-2005-06-16.html )

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Notes on “URI Schemes and Web Protocols” (Tag issue [ schemeProtocols49 ])

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  1. Notes on “URI Schemes and Web Protocols”(Tag issue [schemeProtocols49]) Noah Mendelsohn Dec. 5, 2005

  2. Status • First draft 16 June 2005 (http://www.w3.org/2001/tag/doc/schemeProtocols-2005-06-16.html) • Latest draft 16 June 2005 (http://www.w3.org/2001/tag/doc/schemeProtocols-2005-11-21.html)

  3. Tradeoffs • Web Architecture allows flexibility for general case • Common practice is scheme implies protocol family • This matters to users and to deployed software • There are downsides to requiring multiple URIs when the same resource is supported by multiple protocols

  4. Overall approach • Rules: what the Web architecture allows you to do • Guidelines: suggested common practice(*) (*) In some cases, there are pros and cons to a given implementation choice. In such cases guidelines explain advantages of each.

  5. Rules • Server: (R1) any resource can in principle be served with any protocol, but… • …(R2) must serve faithfully (I.e. retrieve representations or update state of named resource). • (R3) Scheme sets expectations for integrity (http and https are therefore different…not all protocols are appropriate in all cases) • Client: (R7) it’s always safe to attempt access to any resource using any protocol • Modulo integrity concerns…a compromised HTTP implementation may not reliably fail access to an https resource.

  6. General Server Guidelines • (G4) Serving with protocol associated w/scheme is desirable • Users expect this • Supports dispatching on Scheme • (G5) Serve existing schemes with new protocols • No need to change links or create 2 URIs for the same resource when using new protocols • Specifically: (G6) support http scheme if possible

  7. General User Agent Guidelines • Heuristic: (G8) choose protocol based on scheme • (G9) Don’t attempt access with untrustworthy protocols (accessing https://example.org with HTTP is risky)

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