mod_proxy_fcgi: Honor "SetEnv proxy-sendcl". When proxy-sendcl is set, spool the request body to memory/disk so that a Content-Length can be computed and provided to the backend. If not set, still try to prefetch the body in non blocking mode, which allows to handle small bodies (< 16K) the same way by default. PR 57087.
httpd/httpd/trunk/changes-entries/pr57087.txt
httpd/httpd/trunk/modules/proxy/mod_proxy_fcgi.c