Add Header can be used to add a new header with specific value to a request chain. Optionally you can remove the old header, which is left in by default. Values are limited to 4096 characters. Quality assigned to users found in the request headers. If no quality is set, Repose will default this value to 0.1 Quality factors are defined in the HTTP RFC - Section-3.9 (for usage examples, seeHTTP RFC - Section 14.1) as a mechanism for weighting values in multi-value headers. Possible values for quality are 0 to 1.0. This limits header value to 4096 characters.