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13.5.2 Non-modifiable Headers Connected: An Internet Encyclopedia
13.5.2 Non-modifiable Headers

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Next: 13.5.3 Combining Headers

13.5.2 Non-modifiable Headers

13.5.2 Non-modifiable Headers

Some features of the HTTP/1.1 protocol, such as Digest Authentication, depend on the value of certain end-to-end headers. A cache or non-caching proxy SHOULD NOT modify an end-to-end header unless the definition of that header requires or specifically allows that.

A cache or non-caching proxy MUST NOT modify any of the following fields in a request or response, nor may it add any of these fields if not already present:

  • Content-Location
  • ETag
  • Expires
  • Last-Modified

A cache or non-caching proxy MUST NOT modify or add any of the following fields in a response that contains the no-transform Cache- Control directive, or in any request:

  • Content-Encoding
  • Content-Length
  • Content-Range
  • Content-Type

A cache or non-caching proxy MAY modify or add these fields in a response that does not include no-transform, but if it does so, it MUST add a Warning 14 (Transformation applied) if one does not already appear in the response.

    Warning: unnecessary modification of end-to-end headers may cause authentication failures if stronger authentication mechanisms are introduced in later versions of HTTP. Such authentication mechanisms may rely on the values of header fields not listed here.


Next: 13.5.3 Combining Headers

Connected: An Internet Encyclopedia
13.5.2 Non-modifiable Headers

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