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had to be issued because the remote closed the previous/reusable one
during idle (keep-alive) time.


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construction for error handling/jump (as suggested by Ruediger).

Hence we can move backend->close = 1 (for mod_proxy_wstunnel) and
proxy_run_detach_backend() (for mod_proxy_http2) in the cleanup fallback.


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giving write operations a chance after a max of 64k has been read, not entering async keepalive before first request is seen

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This used to check for the backend connection readability only (instead of
the full ping/100-continue round-trip), but the case is already handled by
ap_proxy_connect_backend() which is always called.


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- no need to check for opaque "valid" cert
  flag, since we get here only if internal
  certificate verification of OpenSSL returned
  ok=1.


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- improve renegotiation loop.
  Should now also work in case only the
  cipher changes.
  Should now also work in case the handshake
  ends with an error.


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