http - Golang net/http2请求返回nil

Question

package main

import (
    gotls "crypto/tls"
    "fmt"
    "log"
    "net"
    "net/http"

    tls "github.com/refraction-networking/utls"
    "golang.org/x/net/http2"
)

func main() {
    tr := &http2.Transport{
        DialTLS: func(network, addr string, cfg *gotls.Config) (net.Conn, error) {
            // fmt.Printf("DialTLS(%q, %q)\n", network, addr)
            // conn, err := net.Dial(network, addr)
            // if err != nil {
            //  return nil, err
            // }
            // uconn := utls.UClient(conn, &utls.Config{NextProtos: cfg.NextProtos}, utls.HelloChrome_83)

            // return uconn, err
            tcpConn, err := net.Dial(network, addr)
            if err != nil {
                return nil, err
            }
            config := tls.Config{ServerName: "ja3er.com"}
            tlsConn := tls.UClient(tcpConn, &config, tls.HelloChrome_83)
            err = tlsConn.Handshake()
            if err != nil {
                return nil, err
            }
            return tlsConn, nil
        },
    }

    client := http.Client{
        Transport: tr,
    }
    req, err := http.NewRequest("GET", "https://ja3er.com/json", nil)
    if err != nil {
        log.Fatal(err)
    }
    req.Header.Set("Connection", "keep-alive")
    req.Header.Set("Cache-Control", "max-age=0")
    req.Header.Set("Upgrade-Insecure-Requests", "1")
    req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36")
    req.Header.Set("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9")
    req.Header.Set("dnt", "1")
    req.Header.Set("Sec-Fetch-Site", "none")
    req.Header.Set("Sec-Fetch-Mode", "navigate")
    req.Header.Set("Sec-Fetch-User", "?1")
    req.Header.Set("Sec-Fetch-Dest", "document")
    req.Header.Set("Accept-Language", "en-US,en;q=0.9")

    resp, _ := client.Do(req)
    fmt.Println(resp)
}

目前，我正在尝试通过Chrome_83的TLS客户端发送http2获取请求。我使用net / http模块使用了正常的http / 1.1版本，并尝试使用net / http2模块将其转换为http / 2，但是在发送此请求时，请求响应始终为nil。有人可以帮忙吗？
编辑:
我打印了请求错误，并收到以下消息: Get "https://ja3er.com/json": unexpected EOF

Answer 1

使用以下curl命令时，可以检查端点是否支持http 1.1或http 2。

curl -sI https://ja3er.com/json -o/dev/nul -w '%{http_version}\n'

结果是端点仅支持http 1.1。