In Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used instead of \r\n.
https://github.com/memcached/memcached/compare/1.6.21...1.6.22
https://github.com/memcached/memcached/commit/6987918e9a3094ec4fc8976f01f769f624d790fa