如何修复'An invalid request URI was provided. The request URI must either be an absolute URI or BaseAdd

Question

当我尝试使用 HttpClient.GetStringAsync 发出 GET 请求时，我的程序会爆炸。
这是错误消息：
An invalid request URI was provided. The request URI must either be an absolute URI or BaseAddress must be set.

假设根据用户选择的 IP，我的程序向其不同的变体发出请求，以了解哪一个可用。 例如： 用户选择"192.168.0.20"，然后我的程序必须向"192.168.0.1， 192.168.0.2， ...">

private static readonly HttpClient client = new HttpClient();

try
{
string[] ips = cbxIps.SelectedValue.ToString().Split('.');
string ip = ips[0] + "." + ips[1] + "." + ips[2] + ".";
for (int i = 1; i < 255; i++)
{
var responseString = client.GetStringAsync(ip + i.ToString() + ":8080/alive");
if (responseString.Result == "200")
{
Servidor s = new Servidor(IPAddress.Parse(ip + i.ToString()), "Servidor " + i.ToString());
Servidor.Agregar(s);
}
}
Actualizar();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Answer 1

调用GetStringAsync 时，您需要在 IP 地址之前指定 HTTP 方案(http://或 https://(

例如

var responseString = client.GetStringAsync("https://" + ip + i.ToString() + ":8080/alive");