diff --git a/github2/client.py b/github2/client.py
index a26210d..f01f937 100644
--- a/github2/client.py
+++ b/github2/client.py
@@ -118,3 +118,4 @@ def get_network_data(self, project, nethash, start=None, end=None):
                                                   project,
                                                   "network_data_chunk"]),
                                                   data)
+
diff --git a/github2/core.py b/github2/core.py
index 4a1b619..2272889 100644
--- a/github2/core.py
+++ b/github2/core.py
@@ -172,6 +172,8 @@ def get_values(self, *args, **kwargs):
         else:
             return values
 
+    def raw_non_json_request(self, url):
+        return self.request.raw_non_json_request(url, {})
 
 def doc_generator(docstring, attributes):
     """Utility function to augment BaseDataType docstring
diff --git a/github2/pull_requests.py b/github2/pull_requests.py
index c90872e..1f68805 100644
--- a/github2/pull_requests.py
+++ b/github2/pull_requests.py
@@ -92,3 +92,12 @@ def list(self, project, state="open"):
         """
         return self.get_values(project, state, filter="pulls",
                                datatype=PullRequest)
+
+    def diff(self, *params):
+        if type(params[0]) is PullRequest:
+            pull_request = params[0]
+            return self.raw_non_json_request(pull_request.diff_url)
+        else:
+            [project, number] = params
+            return self.raw_non_json_request("/".join(["https://github.com", project, "pull", str(number) + ".diff"]))
+
diff --git a/github2/request.py b/github2/request.py
index d350d55..cb44541 100644
--- a/github2/request.py
+++ b/github2/request.py
@@ -148,6 +148,21 @@ def make_request(self, path, extra_post_data=None, method="GET"):
         return result
 
     def raw_request(self, url, extra_post_data, method="GET"):
+        response, content = self.base_request(url, extra_post_data, method)
+        json = simplejson.loads(content.decode(charset_from_headers(response)))
+        if json.get("error"):
+            raise self.GithubError(json["error"][0]["error"])
+
+        return json
+
+
+    def raw_non_json_request(self, url, extra_post_data, method="GET"):
+        response, content = self.base_request(url, extra_post_data, method)
+        result = content.decode(charset_from_headers(response))
+
+        return result
+
+    def base_request(self, url, extra_post_data, method="GET"):
         scheme, netloc, path, query, fragment = urlsplit(url)
         post_data = None
         headers = self.http_headers
@@ -166,11 +181,8 @@ def raw_request(self, url, extra_post_data, method="GET"):
             raise HttpError("Unexpected response from github.com %d: %r"
                             % (response.status, content), content,
                             response.status)
-        json = simplejson.loads(content.decode(charset_from_headers(response)))
-        if json.get("error"):
-            raise self.GithubError(json["error"][0]["error"])
 
-        return json
+        return response, content
 
     @property
     def http_headers(self):
@@ -178,3 +190,4 @@ def http_headers(self):
             "User-Agent": "pygithub2 v1",
             "Accept": "application/json",
         }
+