From 606a39a7e167246c5d22e3585db8218ce74e0ac6 Mon Sep 17 00:00:00 2001
From: Yamagishi Kazutoshi <ykzts@desire.sh>
Date: Fri, 31 Jul 2020 09:23:49 +0900
Subject: [PATCH] fix(xmlhttprequest): add support xhr.responseURL (#126)

---
 src/xmlhttprequest.ts              |  4 ++++
 test/integration/xmlhttprequest.ts | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/xmlhttprequest.ts b/src/xmlhttprequest.ts
index 68f6bc0..a8ce204 100644
--- a/src/xmlhttprequest.ts
+++ b/src/xmlhttprequest.ts
@@ -373,6 +373,8 @@ export default class XMLHttpRequest extends XMLHttpRequestEventTarget {
       throw new DOMException('', 'InvalidAccessError');
     }
 
+    this.#responseURL = '';
+
     let parsedURL: URL;
 
     try {
@@ -427,6 +429,8 @@ export default class XMLHttpRequest extends XMLHttpRequestEventTarget {
       this.#statusText = response.statusMessage ?? '';
       this.#responseHeaders = response.headers;
 
+      this.#responseURL = `${protocol}//${parsedURL.host}${path}`;
+
       response.addListener('data', (chunk: Buffer) => {
         if (this.#responseBuffer.length === 0) {
           this.dispatchEvent(new ProgressEvent('loadstart'));
diff --git a/test/integration/xmlhttprequest.ts b/test/integration/xmlhttprequest.ts
index d99784d..27cc3de 100644
--- a/test/integration/xmlhttprequest.ts
+++ b/test/integration/xmlhttprequest.ts
@@ -302,6 +302,25 @@ describe('XMLHttpRequest', () => {
     });
   });
 
+  describe('.responseURL', () => {
+    it('', (done) => {
+      const client = new XMLHttpRequest();
+
+      client.addEventListener('loadstart', () => {
+        expect(client.responseURL).toBe('');
+      });
+
+      client.addEventListener('load', () => {
+        expect(client.responseURL).toMatch(/http:\/\/localhost:\d+\/path\/to/);
+
+        done();
+      });
+
+      client.open('GET', `${baseURL}/path/to`);
+      client.send(null);
+    });
+  });
+
   describe('.withCredentials', () => {
     it('throws InvalidStateError when readyState is DONE', (done) => {
       const client = new XMLHttpRequest();