Signatures: @query clarification

[bblfish]

Also: If there is no query string should the corresponding signing text be
@query: ? or @query:
ie. should the query value be empty or just consist of one ?

Should we return @query: with this request

POST /path HTTP/1.1
Host: www.example.com

and return @query: ? on this request

GET /path? HTTP/1.1
Host: www.example.com

This is what I opted for in my implementation. See

• http4s @query selector shows that http4s makes the distinction between blank queries and empty queries
• akka @query selector is simpler
• two extra tests to distinguish those cases

I think this is a corner case that is worth explicating very clearly, perhaps even with a test.