The Alt-Svc HTTP header is used to inform the clients that the same resource can be reached from another service or protocol, this is useful if you want inform the HTTP clients that your server supports HTTP/2 for example.
Alt-Svc: h2=":443"
When HTTP/2 is enabled, automatically adds this header if the connection is not running on HTTP/2 protocol.
You can enable or disable this feature using the property HTTP2Options.AltSvc.
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