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Maximizing Web Protocol Efficiency: Guidelines for URI Schemes

Understand the tradeoffs, rules, and guidelines for implementing URI schemes and web protocols. Learn about serving resources faithfully, integrity expectations based on schemes, and choosing protocols wisely. Explore the pros and cons of different implementation choices.

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Maximizing Web Protocol Efficiency: Guidelines for URI Schemes

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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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