Use query from http types

src/request.rs

@@ -282,15 +282,7 @@ impl<State> Request<State> {
 
     /// Get the URL querystring.
     pub fn query<T: serde::de::DeserializeOwned>(&self) -> crate::Result<T> {
-        // Default to an empty query string if no query parameter has been specified.
-        // This allows successful deserialisation of structs where all fields are optional
-        // when none of those fields has actually been passed by the caller.
-        let query = self.url().query().unwrap_or("");
-        serde_qs::from_str(query).map_err(|e| {
-            // Return the displayable version of the deserialisation error to the caller
-            // for easier debugging.
-            crate::Error::from_str(StatusCode::BadRequest, format!("{}", e))
-        })
+        self.req.query()
     }
 
     /// Take the request body as a `Body`.