Add disableCompression flag to configuration docs.

Signed-off-by: Geoff Macartney <geoff.macartney@sky.uk>

site/content/docs/main/configuration.md

@@ -80,6 +80,7 @@ Where Contour settings can also be specified with command-line flags, the comman
 | debug                      | boolean                | `false`                                                                                              | Enables debug logging.                                                                                                                                                                                                                                                                        |
 | default-http-versions      | string array           | <code style="white-space:nowrap">HTTP/1.1</code> <br> <code style="white-space:nowrap">HTTP/2</code> | This array specifies the HTTP versions that Contour should program Envoy to serve. HTTP versions are specified as strings of the form "HTTP/x", where "x" represents the version number.                                                                                                      |
 | disableAllowChunkedLength  | boolean                | `false`                                                                                              | If this field is true, Contour will disable the RFC-compliant Envoy behavior to strip the `Content-Length` header if `Transfer-Encoding: chunked` is also set. This is an emergency off-switch to revert back to Envoy's default behavior in case of failures.                                |
+| disableCompression         | boolean                | `false`                                                                                              | This disables GZIP compression HTTP filter from the default Listener filters.     Setting this true will enable Envoy skip "Accept-Encoding: gzip,deflate" request header and always return uncompressed response.                                                                            |
 | disableMergeSlashes        | boolean                | `false`                                                                                              | This field disables Envoy's non-standard merge_slashes path transformation behavior that strips duplicate slashes from request URL paths.                                                                                                                                                     |
 | serverHeaderTransformation | string                 | `overwrite`                                                                                          | This field defines the action to be applied to the Server header on the response path. Values: `overwrite` (default), `append_if_absent`, `pass_through`                                                                                                                                      |
 | disablePermitInsecure      | boolean                | `false`                                                                                              | If this field is true, Contour will ignore `PermitInsecure` field in HTTPProxy documents.                                                                                                                                                                                                     |