:sig
StringMap parse_query(String q)

:params
q : string containing URL parameters
return value : a StringMap containing the parameters

:see
>uri
encode_query
request_context_params

:content
Decodes a query-string fragment such as `a=b&c=d` into a `StringMap`.

Parsing rules:

- pairs are separated on `&`
- each pair is split on the first raw `=` only
- both key and value are URL-decoded
- keyless flags such as `preview` are present with an empty string value
- empty pairs, including a trailing `&`, are ignored
- repeated keys use the last value seen

Examples:


This is useful when you need to work with URL parameter data outside the normal request parsing flow.


:example
StringMap q = parse_query("name=Ada&role=admin");
print(q["name"], "\n");