Brian Clozel 45b27a85f4 Ignore HEAD requests in ShallowEtagHeaderFilter ...

Prior to this commit, the `ShallowEtagHeaderFilter` could participate in
the response and set its ETag/Content-Length headers, even for HEAD
requests. Since the response body is empty, the filter implementation
would set a `"Content-Length: 0"`.

The RFC states that responses to HEAD requests should exhibit identical
response headers to GET (with the possible exception of payload related
headers such as Content-Length.

With this commit, `ShallowEtagHeaderFilter` now ignores HEAD requests
since the proper values may be set already for payload related headers
by the handler. The filter has no way to generate a proper ETag value
nor calculate the content length without the actual body.

Issue: SPR-15261
(cherry picked from commit b732251)

2017-02-20 12:23:06 +01:00

..

src

Ignore HEAD requests in ShallowEtagHeaderFilter

2017-02-20 12:23:06 +01:00