How to solve CORS error on Reverse Proxy?

Website, Application, Performance DNS & Network
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Hi there.

I am configuring a reverse proxy from blog.example.com to example.com/blog using a worker.

The WordPress website is working, but the problem is that I am getting a CORS error on example.com/blog.

However, I am not sure how to resolve this issue.

My two websites are running on Nginx servers and each has its own server block.

In the server block for example.com, I have location /blog { add_header 'Access-Control-Allow-Origin' '*'; } to the server block for example.com, but it didn’t work.

I guess I should probably set it to proxied in cloudflare, can someone give me some advice?

Thanks.

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