Error 520 Ray ID: 566b9f73891ddd42 • 2020-02-17 23:44:19 UTC Web server is returning an unknown error

[deeban]

I am integrating eCommerce application in Magento 2.3.3 and authorize.net payment gateway.
Authorize.net payment gateway is working fine without the Cloudfare environment.

520 error throwing on Cloudflare environment payment API failed with 520 error.

[sdayman]

Community Tip - Fixing Error 520: Web server is returning an unknown error

Error Try the suggestions in this Community Tip to help you fix “Error 520: Web server is returning an unknown error”. Background Error 520 is essentially a catch-all response when something unexpected happens or when the origin server incorrectly interprets or does not tolerate a request due to a protocol violation or an empty response. A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur …