[1] Why `gzip_disable` is added: https://github.com/h5bp/server-configs/pull/92
[2] Why `gzip_disable` is removed: https://github.com/h5bp/server-configs/issues/145
[1] Why `gzip_disable` is added: https://github.com/h5bp/server-configs/pull/92
[2] Why `gzip_disable` is removed: https://github.com/h5bp/server-configs/issues/145