# \[SOLVED\] Headers being stripped

**URL:** <https://discuss.emberjs.com/t/solved-headers-being-stripped/18847>\
**Category:** General\
**Created:** [May 19, 2021, 7:06pm UTC](https://discuss.emberjs.com/t/solved-headers-being-stripped/18847 "2021-05-19T19:06:29Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Verissimo](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/verissimo/32/17455_2.png) [@Verissimo](https://discuss.emberjs.com/u/Verissimo)\
**Post date:** [May 19, 2021, 7:06pm UTC](https://discuss.emberjs.com/t/solved-headers-being-stripped/18847/1 "2021-05-19T19:06:29Z")

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Hi all, I’m new to ember and fairly new to javascript applications, so I might just be doing something incredibly wrong here and would appreciate your help.

Here’s my scenario: I have a backend that will serve multiple frontends served from different domains. I have CORS setup and the necessary headers, including `Access-Control-Expose-Headers` et all.

During development, I am using `ember-cli-mirage` and `ember-simple-auth` with a custom authenticator to handle all the headers I need, and things were working correctly.

As the backend got ready, I used `ember-cli-mirage`’s `passthrough` to talk with the server, also with no issues.

As I got all endpoints ready on the server, I disabled `ember-cli-mirage` and authentication stopped working. I’ve traced it to the headers being dropped - they don’t get passed on the response for the auth fetch - but they did before, with mirage’s passthrough - so I’m assuming the library still does some work to allow the headers to correctly pass down. Any idea of what’s happening and how to fix it?

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<div class="post-metadata">

**Author:** ![Verissimo](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/verissimo/32/17455_2.png) [@Verissimo](https://discuss.emberjs.com/u/Verissimo)\
**Post date:** [May 20, 2021, 3:27am UTC](https://discuss.emberjs.com/t/solved-headers-being-stripped/18847/2 "2021-05-20T03:27:53Z")

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For posterity, in case someone runs into this - I fixed it. I had not imported the `fetch`module. Importing fetch fixed the issue with the headers.🤦‍♂️