X-Forwarded-Proto does not account for multiple values

[ChevronTango]

The specification for the X-Forwarded headers specifies that multiple comma separated values can be used when behind a series of proxies. The current server code does not account for this, and instead incorrectly assumes only a single value is present. This means that when it goes to build the full url it can produce something like http, http://myhost, myhost:8080

If possible this code should account for the multiple values.

In reality, when testing I found that pulling any information at all from the incoming request is prone to error and danger. It would be better to have the WS hostname defined as a server setting rather than pulling it from the host of the incoming request.