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author | Luca Toscano <elukey@apache.org> | 2016-11-17 10:51:50 +0000 |
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committer | Luca Toscano <elukey@apache.org> | 2016-11-17 10:51:50 +0000 |
commit | d0ac237f71cd7b370b5b70855635fe9046998656 (patch) | |
tree | 5347d94dce3746a88c6a787cf1d4b2f574401e4e /docs/manual/mod/mod_headers.xml | |
parent | 1238b5a482e8c32131706456c5b864fbfde8d73e (diff) | |
download | httpd-d0ac237f71cd7b370b5b70855635fe9046998656.tar.gz |
Merge r1769899 from trunk:
Added a note in the mod_headers docs about Content-Type and setifempty
This note has been added as a follow up of a stack overflow post
(thanks to Michael Allan for the research):
http://stackoverflow.com/questions/29398123/apache-2-4-set-mime-type-of-file-without-extension
After a chat in #httpd-dev it seems that the issue boils down to how %{CONTENT_TYPE}
is evaluated in util_expr_eval.c (r->content_type) vs how setifempty is (only a check
of the response headers). This particular behavior might be a bug or feature,
but it is worth to alert our users.
Submitted by: elukey
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1770153 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'docs/manual/mod/mod_headers.xml')
-rw-r--r-- | docs/manual/mod/mod_headers.xml | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/docs/manual/mod/mod_headers.xml b/docs/manual/mod/mod_headers.xml index 99b38518d7..a0c2eca929 100644 --- a/docs/manual/mod/mod_headers.xml +++ b/docs/manual/mod/mod_headers.xml @@ -410,8 +410,17 @@ available in 2.4.10 and later</compatibility> <dt><code>setifempty</code></dt> <dd>The request header is set, but only if there is no previous header - with this name.<br /> - Available in 2.4.7 and later.</dd> + with this name. + <note> + The Content-Type header is a special use case since there might be + the chance that its value have been determined but the header is not part + of the response when <code>setifempty</code> is evaluated. + It is safer to use <code>set</code> for this use case like in the + following example: + <highlight language="config"> + Header set Content-Type "text/plain" "expr=-z %{CONTENT_TYPE}" + </highlight> + </note></dd> <dt><code>unset</code></dt> <dd>The response header of this name is removed, if it exists. |