Module headers 

A small, case-insensitive header map that keeps insertion order.

HTTP field names are case-insensitive, but the order in which a response writes them is worth keeping stable, so that two runs of the same request produce the same bytes on the wire.

Structs

Headers

Header fields, looked up without regard to case and written in the order they were set.

Functions

append_list_value

Append a field value to a comma-separated list, without repeating it.