Apache HTTP Server Version 2.2
Apache Module mod_proxy_scgi
| 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 |
Summary
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.
Warning
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.
See also
Examples
Remember, in order to make the following examples work, you have to
enable mod_proxy and mod_proxy_scgi.
Simple gateway
ProxyPass /scgi-bin/ scgi://localhost:4000/
The balanced gateway needs mod_proxy_balancer in
addition to the already mentioned proxy modules.
Balanced gateway
ProxyPass /scgi-bin/ balancer://somecluster/
<Proxy balancer://somecluster/>
BalancerMember scgi://localhost:4000/
BalancerMember scgi://localhost:4001/
</Proxy>
ProxySCGIInternalRedirect Directive
| 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.
Example
ProxySCGIInternalRedirect Off
ProxySCGISendfile Directive
| 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:
Off- No special handling takes place.
On- The gateway looks for a backend response header called
X-Sendfileand interprets the value as filename to serve. The header is removed from the final response headers. This is equivalent toProxySCGISendfile X-Sendfile. - anything else
- Similar to
On, but instead of the hardcoded header name the argument is applied as header name.
Example
# Use the default header (X-Sendfile)
ProxySCGISendfile On
# Use a different header
ProxySCGISendfile X-Send-Static