Update api.py to raise for bad HTTP status codes

.gitignore

@@ -6,4 +6,4 @@ docs/_build/
 build
 dist
 .venv
-
+.eggs/

chef/api.py

@@ -185,8 +185,8 @@ def __exit__(self, type, value, traceback):
         del api_stack_value()[-1]
 
     def _request(self, method, url, data, headers):
-        request = requests.api.request(method, url, headers=headers, data=data, verify=self.ssl_verify)
-        return request
+        response = requests.api.request(method, url, headers=headers, data=data, verify=self.ssl_verify)
+        return response
 
     def request(self, method, path, headers={}, data=None):
         auth_headers = sign_request(key=self.key, http_method=method,
@@ -201,14 +201,23 @@ def request(self, method, path, headers={}, data=None):
         try:
             response = self._request(method, self.url + path, data, dict(
                 (k.capitalize(), v) for k, v in six.iteritems(request_headers)))
-        except six.moves.urllib.error.HTTPError as e:
-            e.content = e.read()
+            response.raise_for_status()
+        except six.moves.urllib.error.HTTPError as uhe:
+            uhe.content = uhe.read()
             try:
-                e.content = json.loads(e.content.decode())
-                raise ChefServerError.from_error(e.content['error'], code=e.code)
+                uhe.content = json.loads(uhe.content.decode())
+                raise ChefServerError.from_error(uhe.content['error'], code=uhe.code)
             except ValueError:
                 pass
-            raise e
+            raise uhe
+        except requests.exceptions.HTTPError as rhe:
+            try:
+                content = response.json()
+                raise ChefServerError.from_error(content['error'], code=rhe.response.status_code)
+            except ValueError:
+                pass
+            raise rhe
+
         return response
 
     def api_request(self, method, path, headers={}, data=None):