Check if job header is present (#623)

Author: flovilmart

src/RESTController.js

@@ -103,9 +103,8 @@ const RESTController = {
             response = JSON.parse(xhr.responseText);
 
             if (typeof xhr.getResponseHeader === 'function') {
-              var jobStatusId = xhr.getResponseHeader('x-parse-job-status-id');
-              if (jobStatusId) {
-                response = jobStatusId;
+              if ((xhr.getAllResponseHeaders() || '').includes('x-parse-job-status-id: ')) {
+                response = xhr.getResponseHeader('x-parse-job-status-id');
               }
             }
           } catch (e) {

src/__tests__/RESTController-test.js

@@ -221,6 +221,9 @@ describe('RESTController', () => {
         this.responseText = '{}';
         this.readyState = 4;
         this.onreadystatechange();
+      },
+      getAllResponseHeaders: function() {
+        return 'x-parse-job-status-id: 1234';
       }
     };
     RESTController._setXHR(XHR);
@@ -239,6 +242,9 @@ describe('RESTController', () => {
         this.responseText = '{"result":"hello"}';
         this.readyState = 4;
         this.onreadystatechange();
+      },
+      getAllResponseHeaders: function() {
+        return null;
       }
     };
     RESTController._setXHR(XHR);