关于golang:golang-http11的请求负载均衡按照http20转发问题

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要害参数：
TLSNextProto

解决方案：
把 TLSNextProto 设置成空 map，这样就不会主动降级，相当于敞开 http2.0

client := &http.Client {
  Transport:&http.Transport{TLSNextProto: map[string]func(authority string, c *tls.Conn) http.RoundTripper{},},
}

起因：
来自 https://stackoverflow.com/que…
Starting with Go 1.6, the http package has transparent support for the HTTP/2 protocol when using HTTPS. Programs that must disable HTTP/2 can do so by setting Transport.TLSNextProto (for clients) or Server.TLSNextProto (for servers) to a non-nil, empty map. Alternatively, the following GODEBUG environment variables are currently supported:

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