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bitcoin/doc/release-notes-35182.md

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HTTP: RPC / REST
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The HTTP server has been rewritten from scratch to replace libevent. (#35182)
`libevent` has been deprecated as a logging category and will be removed in
a future release. At that time configurations like `debugexclude=libevent` will
be invalid.
Certain HTTP edge cases will observe different behavior to be more RFC-compliant:
- Stricter enforcement of maximum headers size (8192 bytes)
- Reject requests with whitespace in header field-names
- "Line Folding" is rejected (whitespace at start of a header line)
- Tolerate `%` at the end of requested URLs
- Multiple "Content-Length" headers with different values are rejected