[fix] Do not poll if the Location header is missing

Fixes: MONEI#471

Author: lpinca

index.js

@@ -136,7 +136,7 @@ Shopify.prototype.request = function request(uri, method, key, data, headers) {
 
       this.updateLimits(res.headers['x-shopify-shop-api-call-limit']);
 
-      if (res.statusCode === 202) {
+      if (res.statusCode === 202 && res.headers['location']) {
         const retryAfter = res.headers['retry-after'] * 1000 || 0;
         const { pathname, search } = url.parse(res.headers['location']);
 

test/resource-feedback.test.js

@@ -15,7 +15,7 @@ describe('Shopify#resourceFeedback', () => {
     const input = fixtures.req.create;
     const output = fixtures.res.create;
 
-    scope.post('/admin/resource_feedback.json', input).reply(201, output);
+    scope.post('/admin/resource_feedback.json', input).reply(202, output);
 
     return shopify.resourceFeedback
       .create(input.resource_feedback)