add matches to http processors

[sbrunner]

Concerned processors: ForwardHeadersProcessor AddHeadersProcessor UseHttpForHttpsProcessor in place of hosts ? (should be named MapPortProcessor ?) MapUriProcessor ? Others ?

Wanted config for GeoMapFish:

        - !configureHttpRequests
            httpProcessors:
            - !mapUri
                match:
                - !dnsMatch
                    host: ${host}
                mapping:
                    (https?)://${host}/(.*): "$1://127.0.0.1/$2"
            - !portMapping
                match:
                - !dnsMatch
                    host: ${host}
                portMapping:
                    443: 80
            - !forwardHeaders
                match:
                - !dnsMatch
                    host: ${host}
                headers:
                - Cookie
                - Host
            - !forwardHeaders
                headers:
                - Referer

see also: https://github.com/mapfish/mapfish-print/pull/321#issuecomment-144737619

[Jenselme]

We will need this soon. Some of our geoportal are protected by HTTP basic auth. So we forward the Authorization header to the server so MFP can read the tiles. But currently the authorization header is also forwarded to the external WMS that are imported. Of course, that is not the wanted behavior.

[pvalsecc]

I'm working on it. ETA: by the end of the week.

[Jenselme]

@pvalsecc Good news!

[pvalsecc]

To be consistent with !restrictUris, the map will be called matchers, not match

[sbrunner]

looks good :-)