https://bz.apache.org/bugzilla/show_bug.cgi?id=62089

            Bug ID: 62089
           Summary: failover not working with forward proxies
           Product: Apache httpd-2
           Version: 2.4.29
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy_http
          Assignee: bugs@httpd.apache.org
          Reporter: a.abfalte...@gmail.com
  Target Milestone: ---

When using multiple forward proxies (set by ProxyRemote) failover does not work
as expected. The problem seems to be in mod_proxy_http.c when the
scheme_handler tries to connect the next hop (forward proxy)

https://github.com/apache/httpd/blob/2.4.29/modules/proxy/mod_proxy_http.c#L1938-L1947

As "((apr_sockaddr_t*)((proxy_conn_rec*) backend))->addr->next" is not set
ap_proxy_connect_backend() returns immediately after the first connection error

https://github.com/apache/httpd/blob/2.4.29/modules/proxy/proxy_util.c#L2870-L2881

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