CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.CreditssenseicatSeth LarsonReferenceshttps://github.com/python/cpython/pull/146212https://github.com/python/cpython/issues/146211https://mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed
