Name
Header
Synopsis
Header set|append|add header value
or:
Header unset headerServer config, virtual host, access.conf, .htaccess
This directive can replace, merge, or remove HTTP response headers. The action it performs is determined by the first argument. This can be one of the following values:
-
set
The response header is set, replacing any previous header with this name.
-
append
The response header is appended to any existing header of the same name. When a new value is merged onto an existing header, it is separated from the existing header with a comma. This is the HTTP standard way of giving a header multiple values.
-
add
The response header is added to the existing set of headers, even if this header already exists. This can result in two (or more) headers having the same name. This can lead to unforeseen consequences, and in general
append
should be used instead.-
unset
The response header of this name is removed, if it exists. If there are multiple headers of the same name, all will be removed.
This argument is followed by a header name, which can include the
final colon, but it is not required. Case is ignored. For
add
, append
, and
set
, a value is given as the third argument. If
this value contains spaces, it should be surrounded by double quotes.
For unset
, no value should be given.
Order of Processing
The Header
directive can occur almost anywhere
within the server configuration. It is valid in the main server
config and virtual host sections, inside
<Directory>
,
<Location> ...
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