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http.headers.Trailer - Not meaningfully supported in Chrome #18441

Closed
Tracked by #25141
ricea opened this issue Dec 15, 2022 · 5 comments
Closed
Tracked by #25141

http.headers.Trailer - Not meaningfully supported in Chrome #18441

ricea opened this issue Dec 15, 2022 · 5 comments
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data:http 🚠 Compat data for HTTP features. https://developer.mozilla.org/docs/Web/HTTP

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@ricea
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ricea commented Dec 15, 2022

What type of issue is this?

Incorrect support data (ex. Chrome says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

The page about the HTTP Header "Trailer" says that it is supported in Chrome. This is misleading; it is only supported to the extent that it is harmlessly ignored.

What browsers does this problem apply to, if applicable?

Chromium (Chrome, Edge 79+, Opera, Samsung Internet)

What did you expect to see?

Not supported in Chrome.

Did you test this? If so, how?

Verified by looking at the source code.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Trailer

MDN metadata

MDN page report details
  • Query: http.headers.Trailer
  • Report started: 2022-12-15T06:19:29.770Z
@queengooborg queengooborg added the data:http 🚠 Compat data for HTTP features. https://developer.mozilla.org/docs/Web/HTTP label Dec 15, 2022
@mitar
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mitar commented Apr 7, 2024

I can confirm this. It seems on Chrome it ignores even Server-Timings from Trailers: https://issues.chromium.org/issues/40811358

See also Fyrd/caniuse#6159 and Fyrd/caniuse#2482.

@bsmth
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bsmth commented Nov 25, 2024

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

@bsmth bsmth closed this as completed Nov 25, 2024
@mitar
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mitar commented Nov 25, 2024

Thanks. But on mdn it still says:

"This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015."

But when you look at data below, this is not really true? So I think the top message seems misleading?

@bsmth
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bsmth commented Nov 26, 2024

On mdn it still says:

"This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015."

But when you look at data below, this is not really true? So I think the top message seems misleading?

@mitar are you referring to the Baseline banner? This takes some time to be updated / recalculated following BCD updates, so it's no longer showing on this page. Could you check again to confirm?

@mitar
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mitar commented Nov 26, 2024

True. It is not there anymore. Thanks.

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data:http 🚠 Compat data for HTTP features. https://developer.mozilla.org/docs/Web/HTTP
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