CEC-1691 Handle 503 errors (#156)

src/services/certificatesAPI.js

@@ -1,4 +1,8 @@
-import { getAuthHeaderOptions, fetchRespHandler } from "../utils/http";
+import {
+  errorHandler,
+  getAuthHeaderOptions,
+  fetchRespHandler,
+} from "../utils/http";
 
 const API_ENDPOINT = process.env.REACT_APP_CERT_SERVICE_URL;
 
@@ -11,7 +15,9 @@ const certificatesAPI = {
         getAuthHeaderOptions(token)
       ),
       body: JSON.stringify(data),
-    }).then(fetchRespHandler),
+    })
+      .then(fetchRespHandler)
+      .catch(errorHandler),
 };
 
 export default certificatesAPI;