From b7c0891e4eb272d7fafeddaee8c359d5d74487f7 Mon Sep 17 00:00:00 2001
From: Fernando Paredes <nano@fdp.io>
Date: Thu, 17 Dec 2015 22:00:45 -0800
Subject: [PATCH] Update NSURLSession function in README

---
 README.md | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index ea23352a..a487bcca 100644
--- a/README.md
+++ b/README.md
@@ -244,16 +244,21 @@ And what if you need to create your own observable? It's pretty easy. This code
 
 ```swift
 extension NSURLSession {
-    public func rx_response(request: NSURLRequest) -> Observable<(NSData!, NSURLResponse!)> {
+    public func rx_response(request: NSURLRequest) -> Observable<(NSData, NSURLResponse)> {
         return create { observer in
             let task = self.dataTaskWithRequest(request) { (data, response, error) in
-                if data == nil || response == nil {
-                    observer.on(.Error(error ?? UnknownError))
+                guard let response = response, data = data else {
+                    observer.on(.Error(error ?? RxCocoaURLError.Unknown))
+                    return
                 }
-                else {
-                    observer.on(.Next(data, response))
-                    observer.on(.Completed)
+
+                guard let httpResponse = response as? NSHTTPURLResponse else {
+                    observer.on(.Error(RxCocoaURLError.NonHTTPResponse(response: response)))
+                    return
                 }
+
+                observer.on(.Next(data, httpResponse))
+                observer.on(.Completed)
             }
 
             task.resume()