Adding documentation for error.request

README.md

@@ -469,11 +469,16 @@ instance.interceptors.request.use(function () {/*...*/});
 axios.get('/user/12345')
   .catch(function (error) {
     if (error.response) {
-      // The request was made, but the server responded with a status code
+      // The request was made and the server responded with a status code
       // that falls out of the range of 2xx
       console.log(error.response.data);
       console.log(error.response.status);
       console.log(error.response.headers);
+    } else if (error.request) {
+      // The request was made but no response was received
+      // `error.request` is an instance of XMLHttpRequest in the browser and an instance of
+      // http.ClientRequest in node.js
+      console.log(error.request);
     } else {
       // Something happened in setting up the request that triggered an Error
       console.log('Error', error.message);