diff --git a/modules/@angular/http/src/headers.ts b/modules/@angular/http/src/headers.ts
index dc49ddc644..bc243a6976 100644
--- a/modules/@angular/http/src/headers.ts
+++ b/modules/@angular/http/src/headers.ts
@@ -64,13 +64,18 @@ export class Headers {
    * Returns a new Headers instance from the given DOMString of Response Headers
    */
   static fromResponseHeaderString(headersString: string): Headers {
-    return headersString.trim()
-        .split('\n')
-        .map(val => val.split(':'))
-        .map(([key, ...parts]) => ([key.trim(), parts.join(':').trim()]))
-        .reduce(
-            (headers, [key, value]) => !headers.set(normalize(key), value) && headers,
-            new Headers());
+    let headers = new Headers();
+
+    headersString.split('\n').forEach(line => {
+      const index = line.indexOf(':');
+      if (index > 0) {
+        const key = line.substring(0, index);
+        const value = line.substring(index + 1).trim();
+        headers.set(key, value);
+      }
+    });
+
+    return headers;
   }
 
   /**
diff --git a/modules/@angular/http/test/backends/xhr_backend_spec.ts b/modules/@angular/http/test/backends/xhr_backend_spec.ts
index 0d214e83bf..8f0e70ca5f 100644
--- a/modules/@angular/http/test/backends/xhr_backend_spec.ts
+++ b/modules/@angular/http/test/backends/xhr_backend_spec.ts
@@ -571,9 +571,9 @@ export function main() {
                sampleRequest, new MockBrowserXHR(), new ResponseOptions({status: statusCode}));
 
            let responseHeaderString = `Date: Fri, 20 Nov 2015 01:45:26 GMT
-               Content-Type: application/json; charset=utf-8
-               Transfer-Encoding: chunked
-               Connection: keep-alive`;
+Content-Type: application/json; charset=utf-8
+Transfer-Encoding: chunked
+Connection: keep-alive`;
 
            connection.response.subscribe((res: Response) => {
              expect(res.headers.get('Date')).toEqual('Fri, 20 Nov 2015 01:45:26 GMT');
diff --git a/modules/@angular/http/test/headers_spec.ts b/modules/@angular/http/test/headers_spec.ts
index cc522651a2..9b79275ee2 100644
--- a/modules/@angular/http/test/headers_spec.ts
+++ b/modules/@angular/http/test/headers_spec.ts
@@ -109,9 +109,9 @@ export function main() {
     it('should parse a response header string', () => {
 
       let responseHeaderString = `Date: Fri, 20 Nov 2015 01:45:26 GMT
-        Content-Type: application/json; charset=utf-8
-        Transfer-Encoding: chunked
-        Connection: keep-alive`;
+Content-Type: application/json; charset=utf-8
+Transfer-Encoding: chunked
+Connection: keep-alive`;
 
       let responseHeaders = Headers.fromResponseHeaderString(responseHeaderString);