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http.headers.Trailer - reading trailers not supported by Fetch API #14703
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+1 for this. Fairly misleading support table, definitely needs a heavy caveat! Noticed that |
Thanks for raising this. This should be resolved in the linked PR now, so I'm closing as done. See also: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer#browser_compatibility |
What information was incorrect, unhelpful, or incomplete?
Trailer
support table suggests "trailers" are supported by all browsers:THIS IS NOT TRUE: trailers are not supported at all.
The current state is harmful: having
Trailer
header marked as green in that table suggests this is a usable feature, but reading trailers is not supported by Fetch API in any browser.Readers expect to be able to act on trailers advertised in that header, and they waste hours trying to figure out what they do wrong, only to find that... no major browser engine supports reading trailers via Fetch API (from JS):
What did you expect to see?
Did you test this? If so, how?
MDN page report details
http.headers.Trailer
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