Hide range header values on no-cors requests#1937
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jakearchibald
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Jun 23, 2026
| <li><p>If <a>this</a>'s <a for=Headers>guard</a> is "<code>request-no-cors</code>", <var>name</var> | ||
| is not a <a>no-CORS-safelisted request-header name</a>, and <var>name</var> is not a | ||
| <a>privileged no-CORS request-header name</a>, then return. | ||
| is not a <a>no-CORS-safelisted request-header name</a>, then return. |
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This is a behaviour/capability change. Previously you could remove the range from a range request. Now you cannot.
I could make this work, but it seems weird that you can remove a header that doesn't appear to be there (would we fake has too?).
You can remove the range header by modifying some other header - even if you set it back to its original value.
Fwiw this wouldn't be an issue if we returned a fake value. Although that may have other issues.
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Fixed #1936
The rest of the form is TODO.
(See WHATWG Working Mode: Changes for more details.)
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