feat(http): add content-type override support for http request (#10211)

modules/@angular/http/test/static_request_spec.ts

@@ -0,0 +1,81 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {describe, expect, it} from '@angular/core/testing/testing_internal';
+
+import {RequestOptions} from '../src/base_request_options';
+import {ContentType} from '../src/enums';
+import {Headers} from '../src/headers';
+import {Request} from '../src/static_request';
+
+export function main() {
+  describe('Request', () => {
+    describe('detectContentType', () => {
+      it('should return ContentType.NONE', () => {
+        const req = new Request(new RequestOptions({url: 'test', method: 'GET', body: null}));
+
+        expect(req.detectContentType()).toEqual(ContentType.NONE);
+      });
+
+      it('should return ContentType.JSON', () => {
+        const req = new Request(new RequestOptions({
+          url: 'test',
+          method: 'GET',
+          body: null,
+          headers: new Headers({'content-type': 'application/json'})
+        }));
+
+        expect(req.detectContentType()).toEqual(ContentType.JSON);
+      });
+
+      it('should return ContentType.FORM', () => {
+        const req = new Request(new RequestOptions({
+          url: 'test',
+          method: 'GET',
+          body: null,
+          headers: new Headers({'content-type': 'application/x-www-form-urlencoded'})
+        }));
+
+        expect(req.detectContentType()).toEqual(ContentType.FORM);
+      });
+
+      it('should return ContentType.FORM_DATA', () => {
+        const req = new Request(new RequestOptions({
+          url: 'test',
+          method: 'GET',
+          body: null,
+          headers: new Headers({'content-type': 'multipart/form-data'})
+        }));
+
+        expect(req.detectContentType()).toEqual(ContentType.FORM_DATA);
+      });
+
+      it('should return ContentType.TEXT', () => {
+        const req = new Request(new RequestOptions({
+          url: 'test',
+          method: 'GET',
+          body: null,
+          headers: new Headers({'content-type': 'text/plain'})
+        }));
+
+        expect(req.detectContentType()).toEqual(ContentType.TEXT);
+      });
+
+      it('should return ContentType.BLOB', () => {
+        const req = new Request(new RequestOptions({
+          url: 'test',
+          method: 'GET',
+          body: null,
+          headers: new Headers({'content-type': 'application/octet-stream'})
+        }));
+
+        expect(req.detectContentType()).toEqual(ContentType.BLOB);
+      });
+    });
+  });
+}