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http: follow up to r1686271, also needed in 2.4.x/2.2.x by r1686271/r1687339.
Handle reentrance of state BODY_CHUNK_CR to avoid AH02901 when we eat BWS
from multiple reads.

http: follow up to r1686271.
Be lenient up to 10 (room for 32bit decimals) Bad White Spaces (BWS)
between chunk-size and chunk-ext/CRLF.

Submitted by: ylavic
Reviewed by: ylavic, wrowe, mrumph


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http: Fix LimitRequestBody checks when there is no more bytes to read.

Submitted by: Michael Kaufmann <mail michael-kaufmann.ch>
Committed by: ylavic
Reviewed  by: ylavic, mrumph, wrowe


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core: Allow spaces after chunk-size for compatibility with implementations
using a pre-filled buffer.

Proposed by: ylavic, trawick
Reviewed by: ylavic, wrowe, minfrin


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core: Fix chunk header parsing defect.
Remove apr_brigade_flatten(), buffering and duplicated code from
the HTTP_IN filter, parse chunks in a single pass with zero copy.
Limit accepted chunk-size to 2^63-1 and be strict about chunk-ext
authorized characters.

Submitted by: minfrin, ylavic
Reviewed by: ylavic, wrowe, minfrin
Reported by: regilero <regis.leroy makina-corpus.com>
Backports: 1484852, 1684513


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