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CURLOPT_HEADERFUNCTION.md: document folded header unfolding

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Fixes #22296
Closes #22297
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itzTanos29 2026-07-10 12:57:41 -04:00 • committed by Daniel Stenberg
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docs/libcurl/opts/CURLOPT_HEADERFUNCTION.md
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@ -92,10 +92,11 @@ curl_easy_header(3).
# LIMITATIONS
libcurl does not unfold HTTP "folded headers" (deprecated since RFC 7230). A
folded header is a header that continues on a subsequent line and starts with
a whitespace. Such folds are passed to the header callback as separate ones,
although strictly they are continuations of the previous lines.
For legacy HTTP/1 "folded headers" (deprecated since RFC 7230), libcurl
unfolds the lines before calling the header callback. A folded header is a
header that continues on a subsequent line and starts with whitespace. The
callback gets the full single header with one whitespace between the lines.
This unfolding is done since 8.18.0.
# DEFAULT