Worker Requests Blocked by Cloudflare Challenges

[yassine2217]

For Workers & Pages, what is the name of the domain?

I am using the default Cloudflare Worker domain.

What is the error number?

No specific error number is provided, but the response shows a “blocked by Cloudflare challenge” message.

What is the error message?

Here is the exact error message from the Worker log: html Copy code Attention Required! | Cloudflare …

Sorry, you have been blocked

…

What is the issue or error you’re encountering

I am using a Cloudflare Worker to make API requests to an external service (NameSilo), but the requests are being blocked by Cloudflare challenges. This happens even though I’m not using a custom domain for the Worker.

What steps have you taken to resolve the issue?

Added headers like User-Agent, Referer, and X-Requested-With to mimic a legitimate browser.
Implemented rate-limiting to avoid triggering potential rate-limit rules.
Verified the endpoint works outside of Cloudflare Workers without issues.

What are the steps to reproduce the issue?

What are the steps to reproduce the issue?
Deploy a Worker to make requests to https://www.namesilo.com/apibatch/registerDomainDrop.
Trigger the Worker using a URL (e.g., https://my-worker-url/trigger-scheduled).
Observe the response being blocked by Cloudflare challenges.

Screenshot of the error

[sjr]

You will have to contact Namesilo, they are using Cloudflare to protect their site and they will set the rules for access. You can pass them the ray ID if they need to look up the reason at their end.

[yassine2217]

Thank you for your reply i will contact them and add a feedback here