Added method to retrieve response header from failed request. (#59)

Author: Kevin Hellemun

bunq/sdk/client.py

@@ -46,6 +46,8 @@ class ApiClient(object):
     HEADER_GEOLOCATION = 'X-Bunq-Geolocation'
     HEADER_SIGNATURE = 'X-Bunq-Client-Signature'
     HEADER_AUTHENTICATION = 'X-Bunq-Client-Authentication'
+    HEADER_RESPONSE_ID_UPPER_CASED = 'X-Bunq-Client-Response-Id'
+    HEADER_RESPONSE_ID_LOWER_CASED = 'x-bunq-client-response-id'
 
     # Default header values
     _USER_AGENT_BUNQ = 'bunq-sdk-python/0.12.4'
@@ -222,7 +224,8 @@ def _assert_response_success(self, response):
         if response.status_code != self._STATUS_CODE_OK:
             raise ExceptionFactory.create_exception_for_response(
                 response.status_code,
-                self._fetch_error_messages(response)
+                self._fetch_error_messages(response),
+                self._fetch_response_id(response)
             )
 
     @classmethod
@@ -266,6 +269,25 @@ def _fetch_error_descriptions(self, error_dict):
 
         return error_descriptions
 
+    def _fetch_response_id(self, response):
+        """
+        :type response: requests.Response
+
+        :rtype: str
+        """
+
+        headers = response.headers
+
+        if self.HEADER_RESPONSE_ID_UPPER_CASED in headers:
+            return headers[self.HEADER_RESPONSE_ID_UPPER_CASED]
+
+        if self.HEADER_RESPONSE_ID_LOWER_CASED in headers:
+            return headers[self.HEADER_RESPONSE_ID_LOWER_CASED]
+
+        return exception.BunqException(
+            self._ERROR_COULD_NOT_DETERMINE_RESPONSE_ID_HEADER
+        )
+
     def put(self, uri_relative, request_bytes, custom_headers):
         """
         :type uri_relative: str