Ramitta-lib/Ramitta/HttpHelper.cs

using System.IO;
using System.Net;
using System.Net.Http;
using System.Text;

namespace Ramitta.lib
{
    public static class HttpHelper
    {
        // 异步发送HTTP GET请求
        public static async Task<string> SendHttpGetAsync(string url, int timeout = 10000)
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "GET";
                request.Timeout = timeout;
                using (HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
                using (Stream stream = response.GetResponseStream())
                using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
                {
                    return await reader.ReadToEndAsync();
                }
            }
            catch (Exception ex)
            {
                throw new Exception($"GET请求失败: {ex.Message}");
            }
        }

        public static async Task<string> SendHttpPostAsync(string url, string jsonData, int timeout = 10000, bool bypassProxy = true)
        {
            try
            {
                var handler = new HttpClientHandler();

                if (bypassProxy)
                {
                    // 方法1：不使用代理
                    handler.UseProxy = false;
                    handler.Proxy = null;

                    // 方法2：指定某些地址不代理
                    // handler.Proxy = new WebProxy();
                    // handler.UseProxy = true;
                    // handler.PreAuthenticate = true;
                }
                else
                {
                    // 使用系统代理
                    handler.UseProxy = true;
                    handler.Proxy = WebRequest.GetSystemWebProxy();
                }

                // 可选：禁用自动重定向
                handler.AllowAutoRedirect = false;

                using (var client = new HttpClient(handler))
                {
                    client.Timeout = TimeSpan.FromMilliseconds(timeout);
                    var content = new StringContent(jsonData, Encoding.UTF8, "application/json");
                    var response = await client.PostAsync(url, content);

                    // 确保成功状态
                    if (!response.IsSuccessStatusCode)
                    {
                        var errorContent = await response.Content.ReadAsStringAsync();
                        throw new Exception($"HTTP错误 {(int)response.StatusCode} ({response.StatusCode}): {errorContent}");
                    }

                    return await response.Content.ReadAsStringAsync();
                }
            }
            catch (HttpRequestException ex)
            {
                throw new Exception("HTTP请求失败: " + ex.Message);
            }
            catch (TaskCanceledException ex)
            {
                throw new Exception("请求超时: " + ex.Message);
            }
            catch (Exception ex)
            {
                throw new Exception("POST请求失败: " + ex.Message);
            }
        }
    }
}