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added this part:

If you are using self-signed SSL certificate at the origin server, use the following workaround to avoid an HTTP Error 526.

Add your self-signed SSL certificate to the Custom Origin Trust Store. This allows the Cloudflare edge to recognize your self-signed SSL certificate as valid. In your Worker's configuration, enable the cots_on_external_fetch compatibility flag. This flag enables the use of the Custom Origin Trust Store when making external (grey-clouded) subrequests from a Cloudflare Worker.

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Documentation checklist

  • The documentation style guide has been adhered to.
  • If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
  • Files which have changed name or location have been allocated redirects.

added this part: 

If you are using self-signed SSL certificate at the origin server, use the following workaround to avoid an HTTP Error 526.

Add your self-signed SSL certificate to the Custom Origin Trust Store. This allows the Cloudflare edge to recognize your self-signed SSL certificate as valid.
In your Worker's configuration, enable the cots_on_external_fetch compatibility flag. This flag enables the use of the Custom Origin Trust Store when making external (grey-clouded) subrequests from a Cloudflare Worker.
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hyperlint-ai bot commented Jun 13, 2025

Howdy and thanks for contributing to our repo. The Cloudflare team reviews new, external PRs within two (2) weeks. If it's been two weeks or longer without any movement, please tag the PR Assignees in a comment.

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PR Change Summary

Updated documentation to include a workaround for HTTP Error 526 when using self-signed SSL certificates.

  • Added instructions for adding self-signed SSL certificates to the Custom Origin Trust Store.
  • Included steps to enable the cots_on_external_fetch compatibility flag in Worker configurations.

Modified Files

  • src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-526.mdx

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@github-actions github-actions bot added size/s and removed size/xs labels Jun 17, 2025
@ngayerie ngayerie self-requested a review June 17, 2025 09:32
@TracyCloudflare TracyCloudflare merged commit 6571f09 into cloudflare:production Jun 24, 2025
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@workers-devprod workers-devprod added the contribution [Holopin] Recognizes a docs contribution, big or small label Jun 24, 2025
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sdnts pushed a commit to sdnts/cloudflare-docs that referenced this pull request Jul 24, 2025
* Update error-526.mdx

added this part: 

If you are using self-signed SSL certificate at the origin server, use the following workaround to avoid an HTTP Error 526.

Add your self-signed SSL certificate to the Custom Origin Trust Store. This allows the Cloudflare edge to recognize your self-signed SSL certificate as valid.
In your Worker's configuration, enable the cots_on_external_fetch compatibility flag. This flag enables the use of the Custom Origin Trust Store when making external (grey-clouded) subrequests from a Cloudflare Worker.

* Update error-526.mdx

* Update error-526.mdx

---------

Co-authored-by: Nic <[email protected]>
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4 participants