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before the request is sent. PR 57832. ap_proxy_check_backend() can be used before ap_proxy_connect_backend() to try to read available data (including from the filters), and is called by ap_proxy_connect_backend() to check the socket state only (as before, still relevant after ap_proxy_check_backend() due to filter data which may not have triggered a real socket operation). git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1750392 13f79535-47bb-0310-9956-ffa450edef68