Golang HTTP客户端握手失败

Question

Try get webpage:

    tr := &http.Transport{
        TLSHandshakeTimeout: 30 * time.Second,
        DisableKeepAlives: true,
    }

    client := &http.Client{Transport: tr}

    req, err := http.NewRequest("GET", "https://www.fl.ru/", nil)
    if err != nil {
        log.Fatalf("%s
", err);
    }

    resp, err := client.Do(req);
    if err != nil {
        log.Fatalf("%s
", err);
    }
    defer resp.Body.Close()

Get https://www.fl.ru/: remote error: handshake failure.

If I try to get another HTTPS page - all is OK.

Answer 1

That server only supports a few, weak ciphers:

TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x39)   DH 1024 bits (p: 128, g: 1, Ys: 128)   FS   WEAK
TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x33)   DH 1024 bits (p: 128, g: 1, Ys: 128)   FS   WEAK
TLS_RSA_WITH_RC4_128_SHA (0x5)   WEAK

If you really must connect to that server, Go does support the last cipher in the list, but not by default. Create a client with a new tls.Config specifying the cipher you want:

t := &http.Transport{
    Proxy: http.ProxyFromEnvironment,
    Dial: (&net.Dialer{
        Timeout:   30 * time.Second,
        KeepAlive: 30 * time.Second,
    }).Dial,
    TLSHandshakeTimeout: 10 * time.Second,
    TLSClientConfig: &tls.Config{
        CipherSuites: []uint16{tls.TLS_RSA_WITH_RC4_128_SHA},
    },
}