:sig
StringMap

:desc
Associative container mapping `String` keys to `String` values.

`StringMap` is an alias for `std::map<String, String>`.

It is commonly used for:
`context.params`
`context.get`
`context.post`
`context.cookies`
`context.session`
`context.header`

Because it uses `std::map`, `map["key"]` will create an empty entry when that key does not already exist.

Related helpers such as `parse_query()` and `encode_query()` convert between query strings and `StringMap` values.

:see
>types