# CORS header missing on HTTP 201 response

**URL:** <https://discuss.dwolla.com/t/cors-header-missing-on-http-201-response/7817>\
**Category:** Authentication\
**Created:** [February 7, 2022, 11:48pm UTC](https://discuss.dwolla.com/t/cors-header-missing-on-http-201-response/7817 "2022-02-07T23:48:03Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![spencer](https://sea2.discourse-cdn.com/dwolla/user_avatar/discuss.dwolla.com/spencer/32/2143_2.png) [@spencer](https://discuss.dwolla.com/u/spencer)\
**Post date:** [February 8, 2022, 5:04pm UTC](https://discuss.dwolla.com/t/cors-header-missing-on-http-201-response/7817/2 "2022-02-08T17:04:31Z")

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Hi @mikewhat , Dwolla’s API blocks CORS requests for security purposes. Referenced in this thread: [Dwolla.post giving me a CORS error - #2 by shreya](https://discuss.dwolla.com/t/dwolla-post-giving-me-a-cors-error/7652/2)

I’d recommend either moving these calls to your back-end server or utilize our [drop-in components library](https://developers.dwolla.com/concepts/drop-in-components) which is allows you to utilize pre-built UI components to make isolated calls to Dwolla.

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