Apache HTTP Server Version 2.4
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: http://www.arcetri.astro.it/manual/de/mod/mod_proxy_scgi.html
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Apache HTTP Server Version 2.4
| Description: | SCGI gateway module for mod_proxy |
|---|---|
| Status: | Extension |
| Module Identifier: | proxy_scgi_module |
| Source File: | mod_proxy_scgi.c |
| Compatibility: | Available in version 2.2.14 and later |
This module requires the service of mod_proxy. It provides support for the
SCGI protocol, version
1.
Thus, in order to get the ability of handling the SCGI protocol,
mod_proxy and mod_proxy_scgi have to
be present in the server.
Do not enable proxying until you have secured your server. Open proxy servers are dangerous both to your network and to the Internet at large.
Remember, in order to make the following examples work, you have to
enable mod_proxy and mod_proxy_scgi.
ProxyPass /scgi-bin/ scgi://localhost:4000/
The balanced gateway needs mod_proxy_balancer and
at least one load balancer algorithm module, such as
mod_lbmethod_byrequests, in addition to the proxy
modules listed above. mod_lbmethod_byrequests is the
default, and will be used for this example configuration.
ProxyPass /scgi-bin/ balancer://somecluster/
<Proxy balancer://somecluster>
BalancerMember scgi://localhost:4000
BalancerMember scgi://localhost:4001
</Proxy>
In addition to the configuration directives that control the
behaviour of mod_proxy, there are a number of
environment variables that control the SCGI protocol
provider:
mod_proxy_scgi will neither create
nor export the PATH_INFO environment variable. This allows
the backend SCGI server to correctly determine SCRIPT_NAME
and Script-URI and be compliant with RFC 3875 section 3.3.
If instead you need mod_proxy_scgi to generate
a "best guess" for PATH_INFO, set this env-var.| Description: | Enable or disable internal redirect responses from the backend |
|---|---|
| Syntax: | ProxySCGIInternalRedirect On|Off |
| Default: | ProxySCGIInternalRedirect On |
| Context: | server config, virtual host, directory |
| Status: | Extension |
| Module: | mod_proxy_scgi |
The ProxySCGIInternalRedirect enables the backend
to internally redirect the gateway to a different URL. This feature
origins in mod_cgi, which internally redirects the
response, if the response status is OK (200) and
the response contains a Location header and its value starts
with a slash (/). This value is interpreted as a new local
URL the apache internally redirects to.
mod_proxy_scgi does the same as
mod_cgi in this regard, except that you can turn off the
feature.
ProxySCGIInternalRedirect Off
| Description: | Enable evaluation of X-Sendfile pseudo response header |
|---|---|
| Syntax: | ProxySCGISendfile On|Off|Headername |
| Default: | ProxySCGISendfile Off |
| Context: | server config, virtual host, directory |
| Status: | Extension |
| Module: | mod_proxy_scgi |
The ProxySCGISendfile directive enables the
SCGI backend to let files serve directly by the gateway. This is useful
performance purposes -- the httpd can use sendfile or other
optimizations, which are not possible if the file comes over the backend
socket.
The ProxySCGISendfile argument determines the
gateway behaviour:
OffOnX-Sendfile and interprets the value as filename to serve. The
header is removed from the final response headers. This is equivalent to
ProxySCGISendfile X-Sendfile.On, but instead of the hardcoded header name
the argument is applied as header name.
# Use the default header (X-Sendfile)
ProxySCGISendfile On
# Use a different header
ProxySCGISendfile X-Send-Static