Expose the type of receiver against the session

[dombenson]

This is useful for diagnostics or logging when fallback mechanisms are in use

[coveralls]

Coverage decreased (-1.2%) to 93.29% when pulling ad4c80af4831123f738fbd718845f010921a507e on dombenson:expose-receiver-type into cd6986df5bcc018f38ce4c5e07a2dfa6c268fc64 on igm:master.

[FZambia]

The implementation looks not thread-safe, also I think that for debugging purposes it's enough to just use session.Request().URL.Path

Maybe In general the helper like this could be useful but in my opinion it must also distinguish HTTP fallback type used - i.e. xhr-streaming, eventsource etc.

[igm]

fixed in v3