provide pattern synonyms

[winterland1989]

I think it's a good idea to provide pattern synonyms for Header/Method/Status... along aside constants, so people can match them with ease.

[aristidb]

Pull requests accepted. :)

[winterland1989]

OK, here's a plan of attack and some design questions:

Which naming conventions? overall we want these patterns to be convenient both w/wo qualification, i can come with following choices(take Method as an example):

• pattern GET = "GET"

• pattern Get = "GET"

• pattern MethodGet = "GET"

• pattern METHOD_GET = "GET"

  I'm inclined to the first one and last one, but the third one is acceptable to me.

I'd like to use ViewPatterns to deal with HeaderName, but i'm not sure we should provide pattern for Header or HeaderName, i'm inclined to provide Header pattern like pattern HEADER_ACCEPT h <- (foldCase -> "accept", h), but it's maybe a little complex.

We have to provide pattern METHOD_OTHER m = m for sure, or METHOD_NONSTANDARD?

[aristidb]

I think I like "MethodGet".

I'm not sure about whether it should be Header or HeaderName, but I think the foldCase should not be necessary, as OverloadedStrings is supported by the CI type. (Untested.)