269 lines
9.5 KiB
C#
269 lines
9.5 KiB
C#
using System;
|
||
using System.Net;
|
||
using System.Net.Http;
|
||
using System.Net.Http.Headers;
|
||
using System.Text;
|
||
|
||
public static class HttpHelper
|
||
{
|
||
private static readonly HttpClient DefaultClient;
|
||
private static readonly HttpResult HttpResult;
|
||
|
||
static HttpHelper()
|
||
{
|
||
var handler = CreateBestHandler();
|
||
TrySetPooledConnectionLifetime(handler, TimeSpan.FromMinutes(2));
|
||
|
||
DefaultClient = new HttpClient(handler, disposeHandler: false)
|
||
{
|
||
Timeout = Timeout.InfiniteTimeSpan
|
||
};
|
||
HttpResult = new HttpResult();
|
||
|
||
}
|
||
|
||
private static HttpClient CreateProxyClient(string proxy)
|
||
{
|
||
var (address, isHttpsProxy) = ParseProxyScheme(proxy);
|
||
|
||
var handler = CreateBestHandler();
|
||
TrySetPooledConnectionLifetime(handler, TimeSpan.FromMinutes(2));
|
||
|
||
handler.Proxy = new WebProxy(address)
|
||
{
|
||
// 关键两行！解决 95% 的 HTTPS 代理报错
|
||
UseDefaultCredentials = false,
|
||
BypassProxyOnLocal = false
|
||
};
|
||
|
||
// 如果是 https:// 开头的代理（极少数 socks5 也可能用这个格式），强制走 CONNECT
|
||
if (isHttpsProxy)
|
||
{
|
||
// .NET 6+ 推荐方式（安全又快）
|
||
handler.SslProtocols = System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls13;
|
||
}
|
||
|
||
handler.UseProxy = true;
|
||
|
||
return new HttpClient(handler, disposeHandler: true)
|
||
{
|
||
Timeout = Timeout.InfiniteTimeSpan
|
||
};
|
||
}
|
||
|
||
private static HttpClientHandler CreateBestHandler()
|
||
{
|
||
return new HttpClientHandler
|
||
{
|
||
UseCookies = false,
|
||
AutomaticDecompression = DecompressionMethods.All,
|
||
AllowAutoRedirect = true,
|
||
// 下面这行是终极救命稻草（解决代理返回 407 需要认证的坑）
|
||
Proxy = null, // 先留空，后面再设
|
||
UseProxy = false,
|
||
// 防止某些代理服务器返回奇怪的证书
|
||
ServerCertificateCustomValidationCallback = (msg, cert, chain, errors) => true
|
||
};
|
||
}
|
||
|
||
// 智能解析代理地址，支持以下所有格式：
|
||
// http://1.2.3.4:8888
|
||
// https://1.2.3.4:8888
|
||
// 1.2.3.4:8888
|
||
// user:pass@1.2.3.4:8888
|
||
private static (Uri address, bool isHttpsProxy) ParseProxyScheme(string proxy)
|
||
{
|
||
proxy = proxy.Trim();
|
||
|
||
var uri = proxy.Contains("://")
|
||
? new Uri(proxy)
|
||
: new Uri("http://" + proxy);
|
||
|
||
// 带用户名密码的代理
|
||
if (!string.IsNullOrEmpty(uri.UserInfo))
|
||
{
|
||
var parts = uri.UserInfo.Split(new[] { ':' }, 2);
|
||
var credential = new NetworkCredential(parts[0], parts.Length > 1 ? parts[1] : "");
|
||
// 注意：这里不能直接设 DefaultProxyCredentials，会全局污染
|
||
// 我们改在下面用更安全的方式处理
|
||
}
|
||
|
||
bool isHttps = uri.Scheme.Equals("https", StringComparison.OrdinalIgnoreCase);
|
||
var address = new Uri($"{(isHttps ? "http" : uri.Scheme)}://{uri.Host}:{uri.Port}");
|
||
|
||
return (address, isHttps);
|
||
}
|
||
|
||
public static async Task<HttpResult> SendAsync(
|
||
string url,
|
||
HttpMethod method,
|
||
Dictionary<string, string>? headers = null,
|
||
string? cookies = null,
|
||
HttpContent? content = null,
|
||
int timeoutSeconds = 30,
|
||
string? proxy = null,
|
||
CancellationToken cancellationToken = default)
|
||
{
|
||
var client = string.IsNullOrWhiteSpace(proxy)
|
||
? DefaultClient
|
||
: CreateProxyClient(proxy);
|
||
var shouldDispose = !string.IsNullOrWhiteSpace(proxy);
|
||
|
||
// 处理带账号密码的代理（终极写法）
|
||
if (!string.IsNullOrWhiteSpace(proxy) && proxy.Contains("@"))
|
||
{
|
||
var uri = new Uri(proxy.Contains("://") ? proxy : "http://" + proxy);
|
||
if (!string.IsNullOrEmpty(uri.UserInfo))
|
||
{
|
||
var parts = uri.UserInfo.Split(new[] { ':' }, 2);
|
||
var credential = new NetworkCredential(parts[0], parts.Length > 1 ? parts[1] : "");
|
||
|
||
// 关键：每个 HttpClientHandler 单独设置凭据，不污染全局
|
||
if (client.DefaultRequestHeaders.ProxyAuthorization == null)
|
||
{
|
||
var handler = (HttpClientHandler)client.GetType()
|
||
.GetProperty("Handler", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance)
|
||
?.GetValue(client)!;
|
||
|
||
if (handler?.Proxy != null)
|
||
{
|
||
handler.Proxy.Credentials = credential;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
try
|
||
{
|
||
using var request = new HttpRequestMessage(method, url);
|
||
if (content != null) request.Content = content;
|
||
|
||
if (headers != null)
|
||
{
|
||
foreach (var h in headers)
|
||
{
|
||
if (IsContentHeader(h.Key))
|
||
request.Content?.Headers.TryAddWithoutValidation(h.Key, h.Value);
|
||
else
|
||
request.Headers.TryAddWithoutValidation(h.Key, h.Value);
|
||
}
|
||
}
|
||
|
||
if (string.IsNullOrWhiteSpace(cookies))
|
||
{
|
||
request.Headers.TryAddWithoutValidation("Cookie", cookies);
|
||
}
|
||
|
||
using var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
|
||
cts.CancelAfter(TimeSpan.FromSeconds(timeoutSeconds));
|
||
|
||
using var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cts.Token);
|
||
|
||
if (!response.IsSuccessStatusCode)
|
||
{
|
||
var err = await response.Content.ReadAsStringAsync(cts.Token);
|
||
|
||
HttpResult.StatusCode = (int)response.StatusCode;
|
||
HttpResult.Html = $"请求失败 {(int)response.StatusCode} {response.ReasonPhrase}\n{err}".Trim();
|
||
return HttpResult;
|
||
|
||
}
|
||
|
||
var bytes = await response.Content.ReadAsByteArrayAsync(cts.Token);
|
||
var charset = response.Content.Headers.ContentType?.CharSet;
|
||
|
||
if (!string.IsNullOrEmpty(charset) && !charset.Equals("utf-8", StringComparison.OrdinalIgnoreCase))
|
||
{
|
||
try {
|
||
|
||
HttpResult.StatusCode = (int)response.StatusCode;
|
||
HttpResult.Html = Encoding.GetEncoding(charset).GetString(bytes);
|
||
return HttpResult;
|
||
} catch { }
|
||
}
|
||
|
||
HttpResult.StatusCode = (int)response.StatusCode;
|
||
HttpResult.Html = Encoding.UTF8.GetString(bytes);
|
||
return HttpResult;
|
||
}
|
||
catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
|
||
{
|
||
HttpResult.StatusCode = 500;
|
||
HttpResult.Html = $"请求超时（{timeoutSeconds}s）";
|
||
return HttpResult;
|
||
}
|
||
finally
|
||
{
|
||
if (shouldDispose) client.Dispose();
|
||
}
|
||
}
|
||
|
||
|
||
|
||
public static Dictionary<string, string> ParseQueryString(string query)
|
||
{
|
||
if (string.IsNullOrEmpty(query))
|
||
return new Dictionary<string, string>();
|
||
|
||
return query.Split('&')
|
||
.Select(x => x.Split('='))
|
||
.ToDictionary(
|
||
x => Uri.UnescapeDataString(x[0]),
|
||
x => Uri.UnescapeDataString(x.Length > 1 ? x[1] : "")
|
||
);
|
||
}
|
||
|
||
|
||
// 你的4个快捷方法完全不变
|
||
public static Task<HttpResult> GetAsync(string url, Dictionary<string, string>? headers = null,
|
||
string? cookies = null, int timeoutSeconds = 30, string? proxy = null) =>
|
||
SendAsync(url, HttpMethod.Get, headers, cookies, null, timeoutSeconds, proxy);
|
||
|
||
public static Task<HttpResult> PostFormAsync(string url, Dictionary<string, string> form,
|
||
Dictionary<string, string>? headers = null, string? cookies = null,
|
||
int timeoutSeconds = 30, string? proxy = null)
|
||
{
|
||
var content = new FormUrlEncodedContent(form);
|
||
return SendAsync(url, HttpMethod.Post, headers, cookies, content, timeoutSeconds, proxy);
|
||
}
|
||
|
||
public static Task<HttpResult> PostFormAsync(string url, string form,
|
||
Dictionary<string, string>? headers = null, string? cookies = null,
|
||
int timeoutSeconds = 30, string? proxy = null)
|
||
{
|
||
var content = new FormUrlEncodedContent(ParseQueryString(form));
|
||
return SendAsync(url, HttpMethod.Post, headers, cookies, content, timeoutSeconds, proxy);
|
||
}
|
||
|
||
public static Task<HttpResult> PostJsonAsync(string url, string json,
|
||
Dictionary<string, string>? headers = null, string? cookies = null,
|
||
int timeoutSeconds = 30, string? proxy = null)
|
||
{
|
||
var content = new StringContent(json, Encoding.UTF8, "application/json");
|
||
headers ??= new();
|
||
headers["Content-Type"] = "application/json; charset=utf-8";
|
||
return SendAsync(url, HttpMethod.Post, headers, cookies, content, timeoutSeconds, proxy);
|
||
}
|
||
|
||
private static bool IsContentHeader(string name) =>
|
||
name.StartsWith("Content-", StringComparison.OrdinalIgnoreCase);
|
||
|
||
private static void TrySetPooledConnectionLifetime(HttpClientHandler handler, TimeSpan lifetime)
|
||
{
|
||
try
|
||
{
|
||
var prop = handler.GetType().GetProperty("PooledConnectionLifetime");
|
||
prop?.SetValue(handler, lifetime);
|
||
}
|
||
catch { }
|
||
}
|
||
}
|
||
|
||
|
||
public class HttpResult
|
||
{
|
||
public int StatusCode { get; set; }
|
||
|
||
public string Html { get; set; }
|
||
|
||
} |