UploadRequest to provide original xhr request as part of callback par…

src/request/register-listeners.js

@@ -11,10 +11,25 @@ export default ({ xhr, progress, resolve }) => {
     } catch (e) {
       response = xhr.response;
     }
+
+    let headers = xhr
+      .getAllResponseHeaders()
+      .trim()
+      .split(/[\r\n]+/)
+      .map(line => line.split(': '))
+      .reduce(
+        (acc, [header, value]) => {
+          acc[header] = value;
+          return acc;
+        },
+        {}
+      );
+
     resolve({
       response,
       error: xhr.status < 200 || xhr.status >= 300,
       status: xhr.status,
+      headers,
     });
   });
 

tests/unit/request/register-listeners.js

@@ -13,6 +13,9 @@ test('register listeners catches non json', () => {
     addEventListener(name, value) {
       listeners[name] = value;
     },
+    getAllResponseHeaders() {
+      return 'header1: value1\r\nheader2: value2';
+    },
   };
 
   registerListeners({
@@ -26,3 +29,35 @@ test('register listeners catches non json', () => {
   expect(listeners.progress()).toEqual(false);
   expect(resolves[0].response).toEqual('not json');
 });
+
+test('register listeners returns header values', () => {
+  let listeners = {}, resolves = [];
+
+  const xhr = {
+    response: [],
+    upload: {
+      addEventListener(name, value) {
+        listeners[name] = value;
+      },
+    },
+    addEventListener(name, value) {
+      listeners[name] = value;
+    },
+    getAllResponseHeaders() {
+      return 'header1: value1\r\nheader2: value2';
+    },
+  };
+
+  registerListeners({
+    xhr,
+    resolve(value) {
+      resolves.push(value);
+    },
+  });
+  listeners.load();
+
+  const headers = resolves[0].headers;
+
+  expect(headers['header1']).toEqual('value1');
+  expect(headers['header2']).toEqual('value2');
+});

tests/xhr.js

@@ -61,5 +61,8 @@ const mock = values => ({
     setTimeout(() => progress({ loaded: 0.5, total: 1 }), 5);
     setTimeout(() => load(JSON.stringify({ finished: 'hell yes' })), 15);
   },
+  getAllResponseHeaders: () => {
+    return '';
+  },
   ...values,
 });