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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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The old compatibility macro check no longer works,
because those are now actual functions, so an
ifndef is not the correct check.


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- partial support for renegotiations.
  - Not a good design, need to poll until
    renegotitation has finished.
  - Loop criterion not right, if no client certs
    will be send.
  - Also doesn't work for EC or DH ciphers.
    Unclear how to fix with current 1.1.0
    API.
  - Details see
    http://marc.info/?t=145493359200002&r=1&w=2


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Rephrase comment as Norm suggested.


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mod_proxy_express and mod_proxy_hcheck
do not need imports for sockets.


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Netware: pull up ws2nlm imports from all (most)
proxy module makefiles to the main proxy makefile.

The individual module Makefiles overwrite
FILES_nlm_Ximports instead of appending.
Furthermore, now we know which modules need
this import so we can set it specifically
for those.


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enabling when configure was called with
-enable-load-all-modules. The default MPM
should still get enabled automatically.


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Only exist in OpenSSL 1.1.0. They were
renamed from EVP_MD_CTX_create() and
EVP_MD_CTX_destroy().

Followup to r1728979.


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- don't check for SSLeay_version() in configure
  The function no longer exists in 1.1.0.
  It was replaced by OpenSSL_version().
- Switch between SSLeay_version(U) and
  OpenSSL_version() depending on version
  in modules/ssl/ssl_util_ssl.h.
- Use MODSSL_LIBRARY_DYNTEXT everywhere.


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- followup to r1728909 (incomplete switch
  from struct to struct pointer).


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- mod_ssl
Look out for "XXX: OpenSSL 1.1.0:" for a few
open problems.

Not tested with test suite yet.


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