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

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

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

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