6dd493ff_mod_proxy___Apache_HTTP_Server__Description
[Parameter] max [Default] 1...n [Description] 
Hard Maximum number of connections that will be allowed to the backend server. The default for a Hard Maximum for the number of connections is the number of threads per process in the active MPM. In the Prefork MPM, this is always 1, while with the Worker MPM it is controlled by the ThreadsPerChild. Apache will never create more than the Hard Maximum connections to the backend server.
mod_proxy - Apache HTTP Server
Description