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Apache HTTP Server Version 2.5

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This module creates dynamically configured mass reverse proxies, by mapping the Host: header of the HTTP request to a server name and backend URL stored in a DBM file. This allows for easy use of a huge number of reverse proxies with no configuration changes. It is much less feature-full than mod_proxy_balancer, which also provides dynamic growth, but is intended to handle much, much larger numbers of backends. It is ideally suited as a front-end HTTP switch and for micro-services architectures.

This module requires the service of mod_proxy.

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.

• This module is not intended to replace the dynamic capability of mod_proxy_balancer. Instead, it is intended to be mostly a lightweight and fast alternative to using mod_rewrite with RewriteMap and the [P] flag for mapped reverse proxying.
• It does not support regex or pattern matching at all.
• It emulates:

  <VirtualHost *:80>
     ServerName front.end.server
     ProxyPass        "/" "back.end.server:port"
     ProxyPassReverse "/" "back.end.server:port"
  </VirtualHost>

  That is, the entire URL is appended to the mapped backend URL. This is in keeping with the intent of being a simple but fast reverse proxy switch.

The ProxyExpressDBMFile directive points to the location of the Express map DBM file. This file serves to map the incoming server name, obtained from the Host: header, to a backend URL.

The file is constructed from a plain text file format using the httxt2dbm utility.

##
##express-map.txt:
##

www1.example.com http://192.168.211.2:8080

httxt2dbm -i express-map.txt -o emap


ProxyExpressEnable on
ProxyExpressDBMFile emap

The ProxyExpressDBMType directive controls the DBM type expected by the module. The default is the default DBM type created with httxt2dbm.

Possible values are (not all may be available at run time):

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