Description for request headers

[emilsoman]

Currently it looks like headers can only have a name and a value. When using custom headers in requests it may be a good idea to document the intent using a description (like parameters). Does this look like something that can be added to RAD ?

[oestrich]

I think this would be a good addition.

[rpocklin]

I really like the parameter convention, could we make headers use that style declaration instead?

[derikson]

Also response_header (like response_field).