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Re: Weird MAX_CONCURRENT_STREAMS value with empty HTTP/2 SETTINGS frame

From: Ray Satiro via curl-users <curl-users_at_cool.haxx.se>
Date: Fri, 5 Jun 2020 22:36:04 -0400

On 6/5/2020 12:09 PM, Daniel Stenberg via curl-users wrote:
> On Fri, 5 Jun 2020, Alexandre Pion via curl-users wrote:
>
>> I was looking for MAX_CONCURRENT_STREAMS SETTINGS value with curl and
>> it appears that when receiving an empty SETTINGS frame curl says the
>> server announced 4294967295 MAX_CONCURRENT_STREAMS. Is this a normal
>> behavior ?
>
> No it isn't.
>
> Seems like it might be a nghttp2 issue though, as it tells curl
> there's a settings frame and the curl code simply reads what nghttp2
> told it...
>
> Is this reproducible against a public site?

The default max concurrent streams in nghttp2 is 4294967295. [1][2]

[1]:
https://github.com/nghttp2/nghttp2/blob/v1.41.0/lib/nghttp2_session.c#L4425-L4429
[2]:
https://github.com/nghttp2/nghttp2/blob/v1.41.0/lib/nghttp2_session.h#L102-L103

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Received on 2020-06-06