CORS headers are occasionally missing in proxy mode

Website, Application, Performance
1

What is the name of the domain?

weareukraine.org.ua

What is the error number?

Access to XMLHttpRequest at ‘https://weareukraine.org.ua:8443/api…’ from origin ‘https://weareukraine.org.ua’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource

What is the error message?

Access to XMLHttpRequest at ‘https://weareukraine.org.ua:8443/api…’ from origin ‘https://weareukraine.org.ua’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource

What is the issue you’re encountering

CORS headers are occasionally missing in proxy mode on some requests. This is not happening when cloudflare is active.

What steps have you taken to resolve the issue?

There is no special steps. This problem apperas occasionally on Cloudflare servers caching response.

What are the steps to reproduce the issue?

There is no special steps. This problem apperas occasionally on Cloudflare servers caching response.

Screenshot of the error

Same request NO CORS headers.png
Same request NO CORS headers.png592×645 42.7 KB

2

Other screenshots of the problem.
2 similiar requests are made within 1 second. 1 has CORS headers, the other does not.

Same request CORS Headers
Same request CORS Headers592×645 52.3 KB

3

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