httputil: Improve handling of trailing whitespace in headers #3477
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HTTPHeaders had undocumented assumptions about trailing whitespace, leading to an unintentional regression in Tornado 6.4.1 in which passing the arguments of an AsyncHTTPClient header_callback to HTTPHeaders.parse_line would result in errors. This commit moves newline parsing from parse to parse_line. It also strips trailing whitespace from continuation lines (trailing whitespace is not allowed in HTTP headers, but we didn't reject it in continuation lines). This commit also deprecates continuation lines and the legacy handling of LF without CR. Fixes tornadoweb#3321
This was referenced Apr 2, 2025
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HTTPHeaders had undocumented assumptions about trailing whitespace, leading to an unintentional regression in Tornado 6.4.1 in which passing the arguments of an AsyncHTTPClient header_callback to HTTPHeaders.parse_line would result in errors.
This commit moves newline parsing from parse to parse_line. It also strips trailing whitespace from continuation lines (trailing whitespace is not allowed in HTTP headers, but we didn't reject it in continuation lines).
This commit also deprecates continuation lines and the legacy handling of LF without CR.
Fixes #3321