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http3: set tls.Config.ServerName for outgoing requests, if unset (#3867)

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* fix #3865

* add test case

* Update http3/client, client_test.go

Co-authored-by: Marten Seemann <martenseemann@gmail.com>

---------

Co-authored-by: Marten Seemann <martenseemann@gmail.com>
This commit is contained in:
Glonee 2023-06-01 13:45:56 +08:00 • committed by GitHub
parent fce0261c34
commit 21549fcb4a
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9
http3/client.go
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@ -6,6 +6,7 @@ import (
"errors"
"fmt"
"io"
"net"
"net/http"
"strconv"
"sync"
@ -92,6 +93,14 @@ func newClient(hostname string, tlsConf *tls.Config, opts *roundTripperOpts, con
} else {
tlsConf = tlsConf.Clone()
}
if tlsConf.ServerName == "" {
sni, _, err := net.SplitHostPort(hostname)
if err != nil {
// It's ok if net.SplitHostPort returns an error - it could be a hostname/IP address without a port.
sni = hostname
}
tlsConf.ServerName = sni
}
// Replace existing ALPNs by H3
tlsConf.NextProtos = []string{versionToALPN(conf.Versions[0])}