bug#16220: url-http.el: Not conforming to HTTP spec

[Stefan Monnier]

> but I kinda stopped before I really got started, because I couldn't
> figure out how to make this work in the non-lexical binding case.  And
> having this work only with lexical binding seemed kinda meh.

I think it's perfectly OK to have it require lexical-binding.
The macro can signal an error if lexical-binding is nil.


        Stefan