mod_proxy_scgi SCGI gateway module for mod_proxy Extension mod_proxy_scgi.c proxy_scgi_module 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.

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.

 mod_proxy mod_proxy_balancer
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>
ProxySCGISendfile Enable evaluation of X-Sendfile pseudo response header ProxySCGISendfile On|Off|Headername ProxySCGISendfile Off server configvirtual host directory

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-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.
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 ProxySCGIInternalRedirect Enable or disable internal redirect responses from the backend ProxySCGIInternalRedirect On|Off ProxySCGIInternalRedirect On server configvirtual host directory

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