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I see this quite regularly when using various calls in curl.

I'm not sure if its the root cause to some of my returns resulting in error 400 but as a newbie just curious more than anything.

John Toe
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1 Answers1

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It may be that the server does not support ALPN. For example, Debian 8.0 (with OpenSSL 1.0.1k) does only support NPN 2. But Ubuntu 16.04 ship OpenSSL 1.0.2g, which support ALPN, so I'm not sure this is the issue.

I don't think it could cause HTTP 400 errors, except if the server enforce HTTP2.

kenorb
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gileri
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