wasm: add url function to wasm response (#777)

Adds the url function to wasm::Response

src/wasm/client.rs

@@ -2,6 +2,7 @@ use http::Method;
 use js_sys::Uint8Array;
 use std::future::Future;
 use wasm_bindgen::UnwrapThrowExt as _;
+use url::Url;
 
 use super::{Request, RequestBuilder, Response};
 use crate::IntoUrl;
@@ -147,6 +148,8 @@ async fn fetch(req: Request) -> crate::Result<Response> {
     let mut resp = http::Response::builder()
         .status(js_resp.status());
 
+    let url = Url::parse(&js_resp.url()).expect_throw("url parse");
+
     let js_headers = js_resp.headers();
     let js_iter = js_sys::try_iter(&js_headers)
         .expect_throw("headers try_iter")
@@ -162,7 +165,7 @@ async fn fetch(req: Request) -> crate::Result<Response> {
     }
 
     resp.body(js_resp)
-        .map(Response::new)
+        .map(|resp| Response::new(resp, url))
         .map_err(crate::error::request)
 }
 

src/wasm/response.rs

@@ -3,19 +3,24 @@ use std::fmt;
 use bytes::Bytes;
 use js_sys::Uint8Array;
 use http::{HeaderMap, StatusCode};
+use url::Url;
 
 /// A Response to a submitted `Request`.
 pub struct Response {
     http: http::Response<web_sys::Response>,
+    // Boxed to save space (11 words to 1 word), and it's not accessed
+    // frequently internally.
+    url: Box<Url>,
 }
 
 impl Response {
     pub(super) fn new(
         res: http::Response<web_sys::Response>,
-        //url: Url,
+        url: Url,
     ) -> Response {
         Response {
             http: res,
+            url: Box::new(url),
         }
     }
 
@@ -37,6 +42,12 @@ impl Response {
         self.http.headers_mut()
     }
 
+    /// Get the final `Url` of this `Response`.
+    #[inline]
+    pub fn url(&self) -> &Url {
+        &self.url
+    }
+
     /* It might not be possible to detect this in JS?
     /// Get the HTTP `Version` of this `Response`.
     #[inline]