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tls,http2: send fatal alert on ALPN mismatch
To comply with RFC 7301, make TLS servers send a fatal alert during the TLS handshake if both the client and the server are configured to use ALPN and if the server does not support any of the protocols advertised by the client. This affects HTTP/2 servers. Until now, applications could intercept the 'unknownProtocol' event when the client either did not advertise any protocols or if the list of protocols advertised by the client did not include HTTP/2 (or HTTP/1.1 if allowHTTP1 was true). With this change, only the first case can be handled, and the 'unknownProtocol' event will not be emitted in the second case because the TLS handshake fails and no secure connection is established. PR-URL: #44031 Reviewed-By: Paolo Insogna <paolo@cowtech.it> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
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