more apr_uint32_t usage where appropriate, signed/unsigned warning detox, stream reset clears buffers immediately

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Reported by: Norm <normw gknw.net>


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Explain some risks at looking at per-request environment variables
set by other modules within <If>.

http://stackoverflow.com/questions/39462011/htaccess-if-else-always-selects-else




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This added paragraph about optional and optional_no_ca isn't helpful.

At the TLS layer, the challenge for otpional and required are no different.

Move the caution about _no_ca up into where the option is defined
and reword.




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are transmitted unencoded, per RFC3986 section 3.3 grammer. Correct httpd's
behavior to not encode ';' in proxied URI's or Location: response headers.



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The ap_scan_script_header_* functions were documented to be pass/fail,
but they also have a third "state" that is returned when HTTP conditions
(If-Modified-Since, etc.) aren't met. This has led to some recent bugs,
so document it.

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mod_proxy_html doc - Added a reference of ProxyHTMLLinks in the ProxyHTMLURLMap description and some examples.
 


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never remember.


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This is a follow up of http://svn.apache.org/r1752347;
ap_meet_conditions could return a 412 status that if not
handled causes subsequent bogus reads and wrong messages
logged (like AH01070). After a chat on dev@ the feedback
was to couple HTTP_NOT_MODIFIED with HTTP_PRECONDITION_FAILED,
but any other feedback is welcome.



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mod_http2: more const goodiness and checks on h2 request creation, less NULL checking while processing

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brigades.

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MSDN documentation states that

    Any unused members of [an OVERLAPPED] structure should always be
    initialized to zero before the structure is used in a function call.
    Otherwise, the function may fail and return ERROR_INVALID_PARAMETER.

Prior to this patch, the internal state left over from previous
overlapped I/O was passed into the next call. It's unclear what effect
this might have, if any. (I have not personally witnessed an
ERROR_INVALID_PARAMETER myself.)

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Further follow-up to the previous commit: now that we no longer patch a
network bucket into the brigade, we can revert to calling
ap_process_connection() directly instead of duplicating its logic.

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Follow-up to the prior commit: without an incoming data buffer, the
custom network bucket code is now orphaned and we can remove it
entirely. This has the added benefit that we are no longer using the
internal OVERLAPPED.Pointer field, which is discouraged by the MSDN
docs.

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