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19.7 Compatibility with Previous Versions Connected: An Internet Encyclopedia
19.7 Compatibility with Previous Versions

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Next: 19.7.1 Compatibility with HTTP/1.0 Persistent Connections

19.7 Compatibility with Previous Versions

19.7 Compatibility with Previous Versions

It is beyond the scope of a protocol specification to mandate compliance with previous versions. HTTP/1.1 was deliberately designed, however, to make supporting previous versions easy. It is worth noting that at the time of composing this specification, we would expect commercial HTTP/1.1 servers to:

  • recognize the format of the Request-Line for HTTP/0.9, 1.0, and 1.1 requests;

  • understand any valid request in the format of HTTP/0.9, 1.0, or 1.1;

  • respond appropriately with a message in the same major version used by the client.

And we would expect HTTP/1.1 clients to:

  • recognize the format of the Status-Line for HTTP/1.0 and 1.1 responses;

  • understand any valid response in the format of HTTP/0.9, 1.0, or 1.1.

For most implementations of HTTP/1.0, each connection is established by the client prior to the request and closed by the server after sending the response. A few implementations implement the Keep-Alive version of persistent connections described in section 19.7.1.1.


Next: 19.7.1 Compatibility with HTTP/1.0 Persistent Connections

Connected: An Internet Encyclopedia
19.7 Compatibility with Previous Versions

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