query static method
A QUERY route (RFC 10008): a safe, idempotent read like GET, with
the query in the request content instead of the URL — so it is not
limited in length, and is less often written to logs on the way.
The request must say what its content is with Content-Type; one
that does not, or whose content does not parse as that type, is
answered with a 400. Content the framework does not parse into
fields, such as application/sql, is in Request.rawBody.
Implementation
static Router query(String path, Function action) =>
_addRoute(HttpRequestMethod.query, path, action);