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core: Limit to ten the number of tolerated empty lines between request,
and consume them before the pipelining check to avoid possible response
delay when reading the next request without flushing.

Before this commit, the maximum number of empty lines was the same as
configured LimitRequestFields, defaulting to 100, which was way too much.
We now use a fixed/hard limit of 10 (DEFAULT_LIMIT_BLANK_LINES).

check_pipeline() is changed to check for (up to the limit) and comsume the
trailing [CR]LFs so that they won't be interpreted as pipelined requests,
otherwise we would block on the next read without flushing data, and hence
possibly delay pending response(s) until the next/real request comes in or
the keepalive timeout expires.
 
Finally, when the maximum number of empty line is reached in
read_request_line(), or that request line does not contains at least a method
and an (valid) URI, we can fail early and avoid some failure detected in
further processing.


* Ensure that proto_num and protocol is set in another "error out early" edge
  case. This can happen with invalid CONNECT requests as described in the PR.

PR: 58929


Submitted by: ylavic, rpluem
Reviewed  by: wrowe, covener, ylavic


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Reject requests containing (invalid) NULL characters in request line
or request headers.
PR 43039


use APR_STATUS_IS_TIMEUP() instead of direct comparison with APR_TIMEUP.


Use APR_STATUS_IS_... in some more cases.

While this is not strictly necessary everywhere, it makes it much easier
to find the problematic cases.


Submitted by: niq, covener, sf
Reviewed  by: wrowe, covener, ylavic


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unconditional



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in sync with 2.4, allowing us to consider much more similar backport proposals
to both.



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Submitted by: trawick
s/ensure/insure/

Comment-only change, simply to ensure reviewers can review patches from trunk.



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without functional changes.

Backports: r1213391, r1237407
Submitted by: rjung

zap an unhelpful, out of date comment from httpd 1.2
s/insure/ensure/

Backports: r1407004, r1407088, r1407528 
Submitted by: sf

Remove unused code. "Next week" hasn't happened in the last 10 years or so.
remove some more old unused code
remove obsolete comment from 1.3 days

Backports: r1621419 (protocol.c only)
Submitted by: jailletc36

Fix sscanf format spotted by cppcheck 
(changes version major/minor types from signed to unsigned)


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connection is aborted before the body is fully read.  PR 45049.

Backports: n/a (2.2.x only)
Submitted by: Nick Pace <nick simplylogic.net>, Edward Lu, Yann Ylavic
Reviewed by: ylavic, wrowe, rpluem


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