Apache HTTP服务器 2.0版本
现有的语种: en
说明: | Customization of HTTP request and response headers |
---|---|
状态: | Extension |
模块名: | headers_module |
源文件: | mod_headers.c |
兼容性: | RequestHeader
is available only in Apache 2.0 |
This module provides directives to control and modify HTTP request and response headers. Headers can be merged, replaced or removed.
The directives provided by mod_headers
can occur
almost anywhere within the server configuration. They are valid in the
main server config and virtual host sections, inside
<Directory>
,
<Location>
and
<Files>
sections,
and within .htaccess
files.
The directives are processed in the following order:
<Directory>
sections and
.htaccess
<Files>
<Location>
Order is important. These two headers have a different effect if reversed:
RequestHeader append MirrorID "mirror 12"
RequestHeader unset MirrorID
This way round, the MirrorID
header is not set. If
reversed, the MirrorID header is set to "mirror 12".
Header echo ^TS
MyHeader
, to the response including a
timestamp for when the request was received and how long it
took to begin serving the request. This header can be used by
the client to intuit load on the server or in isolating
bottlenecks between the client and the server.
Header add MyHeader "%D %t"
results in this header being added to the response:
MyHeader: D=3775428 t=991424704447256
Header add MyHeader "Hello Joe. It took %D microseconds \
for Apache to serve this request."
results in this header being added to the response:
MyHeader: Hello Joe. It took D=3775428 microseconds for Apache
to serve this request.
MyHeader
on the response if and
only if header "MyRequestHeader" is present on the request. This
is useful for constructing headers in response to some client
stimulus. Note that this example requires the services of the
mod_setenvif
module.
SetEnvIf MyRequestHeader value HAVE_MyRequestHeader
Header add MyHeader "%D %t mytext" env=HAVE_MyRequestHeader
If the header MyRequestHeader: value
is present on
the HTTP request, the response will contain the following header:
MyHeader: D=3775428 t=991424704447256 mytext
说明: | Configure HTTP response headers |
---|---|
语法: | Header set|append|add|unset|echo header
[value [env=[!]variable]] |
上下文: | 服务器配置, 虚拟主机, 目录, .htaccess |
覆盖项: | FileInfo |
状态: | Extension |
模块: | mod_headers |
This directive can replace, merge or remove HTTP response headers. The header is modified just after the content handler and output filters are run, allowing outgoing headers to be modified. The action it performs is determined by the first argument. This can be one of the following values:
set
append
add
unset
echo
This argument is followed by a header name, which
can include the final colon, but it is not required. Case is
ignored for set
, append
, add
and unset
. The header name for echo
is case sensitive and may be a regular expression.
For add
, append
and set
a
value is specified as the third argument. If value
contains spaces, it should be surrounded by doublequotes.
value may be a character string, a string containing format
specifiers or a combination of both. The following format specifiers
are supported in value:
%t |
The time the request was received in Universal Coordinated Time
since the epoch (Jan. 1, 1970) measured in microseconds. The value
is preceded by t= . |
%D |
The time from when the request was received to the time the
headers are sent on the wire. This is a measure of the duration
of the request. The value is preceded by D= . |
%{FOOBAR}e |
The contents of the environment
variable FOOBAR . |
When the Header
directive is used with the
add
, append
, or set
argument, a fourth argument may be used to specify conditions
under which the action will be taken. If the environment variable specified in the
env=...
argument exists (or if the environment
variable does not exist and env=!...
is specified)
then the action specified by the Header
directive
will take effect. Otherwise, the directive will have no effect
on the request.
The Header
directives are processed just
before the response is sent to the network. These means that it is
possible to set and/or override most headers, except for those headers
added by the header filter.
说明: | Configure HTTP request headers |
---|---|
语法: | RequestHeader set|append|add|unset header
[value] |
上下文: | 服务器配置, 虚拟主机, 目录, .htaccess |
覆盖项: | FileInfo |
状态: | Extension |
模块: | mod_headers |
This directive can replace, merge or remove HTTP request headers. The header is modified just before the content handler is run, allowing incoming headers to be modified. The action it performs is determined by the first argument. This can be one of the following values:
set
append
add
append
should be
used instead.unset
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
value contains spaces, it should be surrounded by double
quotes. For unset, no value should be given.
The RequestHeader
directive is processed
just before the request is run by its handler in the fixup phase.
This should allow headers generated by the browser, or by Apache
input filters to be overridden or modified.
现有的语种: en