9e5cd3bf_mod_proxy___Apache_HTTP_Server__Description
[Parameter] max [Default] 1...n [Description] 
Maximum number of connections that will be allowed to the backend server. The default for this limit is the number of threads per process in the active MPM. In the Prefork MPM, this is always 1, while with other MPMs it is controlled by the ThreadsPerChild directive.
mod_proxy - Apache HTTP Server
Description