如何设置用于HTTP请求的IP？

您可以在客户端传输中设置自定义拨号程序。

// Create a transport like http.DefaultTransport, but with a specified localAddrtransport := &http.Transport{    Proxy: http.ProxyFromEnvironment,    DialContext: (&net.Dialer{        Timeout:   30 * time.Second,        KeepAlive: 30 * time.Second,        LocalAddr: localAddr,        DualStack: true,    }).DialContext,    MaxIdleConns:          100,    IdleConnTimeout:       90 * time.Second,    TLSHandshakeTimeout:   10 * time.Second,    ExpectContinueTimeout: 1 * time.Second,}client := &http.Client{    Transport: transport,}