Set the HOST header in Http2ClientInitializer when trying to start an… #9177
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… upgrade request
Motivation:
The io.netty.example.http2.helloworld.client.Http2Client example should work in the h2c (HTTP2 cleartext - non-TLS) mode, which is the default for this example unless you set a -Dssl VM param. As we do not set the HOST header some servers do reject the upgrade request.
Modifications:
Set the HOST header
Result:
Fixes #9115.