[1] RFC 3749 - Transport Layer Security Protocol Compression Methods ( 版) http://tools.ietf.org/html/rfc3749
In order to help prevent compression-related attacks (summarized in
Section 2.6 of [RFC7457]), implementations and deployments SHOULD
disable TLS-level compression (Section 6.2.2 of [RFC5246]), unless
the application protocol in question has been shown not to be open to
such attacks.
[3] OpenSSL (OpenSSL Foundation, Inc. 著, 版) https://www.openssl.org/docs/manmaster/ssl/SSL_COMP_add_compression_method.html