Merge pull request #1172 from sherry0429/dev

add warn when apiThunk receive not application/json response

Author: alexcjohnson

dash-renderer/src/actions/api.js

@@ -1,7 +1,10 @@
-import {mergeDeepRight} from 'ramda';
+import {mergeDeepRight, once} from 'ramda';
 import {handleAsyncError, getCSRFHeader} from '../actions';
 import {urlBase} from './utils';
 
+/* eslint-disable-next-line no-console */
+const logWarningOnce = once(console.warn);
+
 function GET(path, fetchConfig) {
     return fetch(
         path,
@@ -53,6 +56,9 @@ export default function apiThunk(endpoint, method, store, id, body) {
                         return json;
                     });
                 }
+                logWarningOnce(
+                    'Response is missing header: content-type: application/json'
+                );
                 return dispatch({
                     type: store,
                     payload: {