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http: prefer chunked encoding over Content-Length: 0

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Call http_size() before checking the request for empty body to prefer
Transfer-Encoding: chunked even if Content-Length is 0.

Closes #21706
This commit is contained in:
Josef Cejka 2026-05-20 18:07:16 +02:00 • committed by Daniel Stenberg
parent 28341c303d
commit ba600296d2
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3 changed files with 89 additions and 9 deletions
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2
tests/data/Makefile.am
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@ -222,7 +222,7 @@ test1650 test1651 test1652 test1653 test1654 test1655 test1656 test1657 \
test1658 test1659 test1660 test1661 test1662 test1663 test1664 test1665 \
test1666 test1667 test1668 test1669 \
\
test1670 test1671 test1672 test1673 test1674 test1675 test1676 \
test1670 test1671 test1672 test1673 test1674 test1675 test1676 test1677 \
\
test1680 test1681 test1682 test1683 test1684 test1685 \
\

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tests/data/test1677 Normal file
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@ -0,0 +1,77 @@
<?xml version="1.0" encoding="US-ASCII"?>
<testcase>
<info>
<keywords>
HTTP
HTTP POST
chunked Transfer-Encoding
Content-Length
</keywords>
</info>
# Regression test for bug where curl stops reading chunked response
# when both Content-Length: 0 and Transfer-Encoding: chunked headers
# are present. Per RFC 7230 Section 3.3.3, Transfer-Encoding should
# take precedence and Content-Length should be ignored.
# The writedelay simulates the timing issue where chunks arrive in
# separate packets.
# Server-side
<reply>
<servercmd>
writedelay: 500
</servercmd>
<data nocheck="yes" crlf="headers">
HTTP/1.1 200 OK
content-type: text/json
connection: keep-alive
content-length: 0
transfer-encoding: chunked
1a
random data in first chunk
1d
another data in second chunk
15
third and last chunk
0
</data>
</reply>
# Client-side
<client>
<server>
http
</server>
<name>
HTTP POST response with both Transfer-Encoding chunked and Content-Length 0
</name>
<command>
http://%HOSTIP:%HTTPPORT/%TESTNUMBER -d "testdata"
</command>
</client>
# Verify data after the test has been "shot"
<verify>
<protocol nonewline="yes" crlf="headers">
POST /%TESTNUMBER HTTP/1.1
Host: %HOSTIP:%HTTPPORT
User-Agent: curl/%VERSION
Accept: */*
Content-Length: 8
Content-Type: application/x-www-form-urlencoded
testdata
</protocol>
<stdout nonewline="yes" crlf="headers">
HTTP/1.1 200 OK
content-type: text/json
connection: keep-alive
content-length: 0
transfer-encoding: chunked
random data in first chunk another data in second chunk third and last chunk
</stdout>
</verify>
</testcase>