feat(network): introduce Response.statusText() (#3193)

Fixes #317.

docs/api.md

@@ -269,6 +269,7 @@
   * [response.request()](#responserequest)
   * [response.securityDetails()](#responsesecuritydetails)
   * [response.status()](#responsestatus)
+  * [response.statusText()](#responsestatustext)
   * [response.text()](#responsetext)
   * [response.url()](#responseurl)
 - [class: SecurityDetails](#class-securitydetails)
@@ -3089,6 +3090,11 @@ Contains a boolean stating whether the response was successful (status in the ra
 
 Contains the status code of the response (e.g., 200 for a success).
 
+#### response.statusText()
+- returns: <[string]>
+
+Contains the status text of the response (e.g. usually an "OK" for a success).
+
 #### response.text()
 - returns: <[Promise]<[string]>> Promise which resolves to a text representation of response body.
 

lib/NetworkManager.js

@@ -507,6 +507,7 @@ class Response {
       port: responsePayload.remotePort,
     };
     this._status = responsePayload.status;
+    this._statusText = responsePayload.statusText;
     this._url = request.url();
     this._fromDiskCache = !!responsePayload.fromDiskCache;
     this._fromServiceWorker = !!responsePayload.fromServiceWorker;
@@ -544,6 +545,13 @@ class Response {
     return this._status;
   }
 
+  /**
+   * @return {string}
+   */
+  statusText() {
+    return this._statusText;
+  }
+
   /**
    * @return {!Object}
    */

test/network.spec.js

@@ -62,6 +62,15 @@ module.exports.addTests = function({testRunner, expect}) {
       expect(remoteAddress.port).toBe(server.PORT);
     });
 
+    it('Response.statusText', async({page, server}) => {
+      server.setRoute('/cool', (req, res) => {
+        res.writeHead(200, 'cool!');
+        res.end();
+      });
+      const response = await page.goto(server.PREFIX + '/cool');
+      expect(response.statusText()).toBe('cool!');
+    });
+
     it('Response.fromCache()', async({page, server}) => {
       const responses = new Map();
       page.on('response', r => responses.set(r.url().split('/').pop(), r));