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Re: Unknown Content-Encoding value and zero-lenght string CURLOPT_ACCEPT_ENCODING

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From: Daniel Stenberg via curl-library <curl-library_at_lists.haxx.se>
Date: Thu, 28 Oct 2021 13:15:20 +0200 (CEST)

On Thu, 28 Oct 2021, Fujii Hironori via curl-library wrote:

> Monaco Editor Samples is using their own HTTP server 'yaserver' which sends
> an invalid 'Content-Encoding: utf8' header.

Shouldn't you then report this as an error against yaserver?

> However, if I invoke curl commnad with '--compressed' switch, it reports
> 'CURLE_BAD_CONTENT_ENCODING' error.

It's not a known encoding to libcurl.

> https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding>
> 'identity' value "is always considered as acceptable, even if omitted."

The better reference for the header is here:
https://datatracker.ietf.org/doc/html/rfc7231#section-3.1.2.2

> Why doesn't curl treat the unknown encoding as identity if
> CURLOPT_ACCEPT_ENCODING is set to ""?

I don't think that's what it says we should do, because that would then also
pass on contents compressed with other algorithm than what curl supports etc.

But I understand what you're asking for. Maybe we should provide a way to tell
libcurl "when no matching encoding is found, pretend it was identity". Of
course that will then risk passing on complete garbage at times.

> Should WinCairo set the CURLOPT_ACCEPT_ENCODING explicitly to the following
> instead of "" ?
>
>> curl_easy_setopt(m_handle, CURLOPT_ACCEPT_ENCODING, "identity, deflate,
> gzip, br");

That list still doesn't include 'utf8'.

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Received on 2021-10-28

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