Axios request that are sent via `passthrough()` don't resolve

Hi,

I have a problem with using miragejs and axios together. When I send a request to a mocked route which has a handler, everything is ok: promise is pending, requests gets sent and I get 200, promise resolves. But when I send a request to a not mocked route and passthrough is configured to let it pass, strange thing happens: promise is pending, request gets sent and I get 200 but the promise doesn’t resolve, it’s stuck in pending state. It only happens when I use axios and when I try to send a request to a route that is not mocked, fetch works just fine. Here’s a simple example: https://codesandbox.io/s/buggy-passthrough-example-o919g

Is it possible to somehow make miragejs work with Axios?

[kurdin]

@cah-briangantzler @bbansalWolfPack

If anyone else having this problem, you can fix it by patching axios currently latest version 0.27.2 with this diff

diff --git a/node_modules/axios/lib/adapters/xhr.js b/node_modules/axios/lib/adapters/xhr.js
index 76d7e7a..7e11408 100644
--- a/node_modules/axios/lib/adapters/xhr.js
+++ b/node_modules/axios/lib/adapters/xhr.js
@@ -80,7 +80,7 @@ module.exports = function xhrAdapter(config) {
     if ('onloadend' in request) {
       // Use onloadend if available
       request.onloadend = onloadend;
-    } else {
+    }
       // Listen for ready state to emulate onloadend
       request.onreadystatechange = function handleLoad() {
         if (!request || request.readyState !== 4) {
@@ -98,7 +98,7 @@ module.exports = function xhrAdapter(config) {
         // so we should call onloadend on the next 'tick'
         setTimeout(onloadend);
       };
-    }
+

You can place this file to your project’s root /patches/axios+0.27.2.patch
do npm i patch-package and add to your package.json scripts section "postinstall": "patch-package"

That makes change permanent for local development but I would remove it on production along with disabling Mirage mock API server.

[xerardoo]

I fix the issue downgrading axios to 0.21.0 and works with miragejs [ 0.1.41, 0.1.42.0, 0.1.43.0 ]