在framework中，大量并发 HttpWebRequest 需要设置一个最大连接数

ServicePointManager.DefaultConnectionLimit = 200;

但是在.net core中却无效，因为core不使用ServicePointManager 管理连接数，在core中只有使用HttpClient，HttpCilentFactory来管理连接数，如果在core中使用ServicePointManager 不但不起作用，并且大量并发使用HttpWebRequest 会导致 IIS 直接假死，所以在core中，只能使用HttpClient 和 HttpCilentFactory这一条路可走

在Core中的StartUp注册一个HttpClient的名字

public void ConfigureServices(IServiceCollection services) { services.AddHttpClient("HttpClientFactoryDemo"); }

然后在Controller中创建

using System;using System.Collections.Generic;using System.Net.Http;using System.Net.Http.Headers;using System.Text;using System.Threading.Tasks;using System.Web;using Microsoft.AspNetCore.Mvc; namespace HttpClientFactoryDemo.Controllers{ [Route("api/[controller]")] [ApiController] public class ValuesController : ControllerBase { private readonly IHttpClientFactory _httpClientFactory; public ValuesController(IHttpClientFactory httpClientFactory) { _httpClientFactory = httpClientFactory; } public static string UrlEncode(string temp, Encoding encoding) { StringBuilder stringBuilder = new StringBuilder(); for (int i = 0; i < temp.Length; i++) { string t = temp[i].ToString(); string k = HttpUtility.UrlEncode(t, encoding); if (t == k) { stringBuilder.Append(t); } else { stringBuilder.Append(k.ToUpper()); } } return stringBuilder.ToString(); } [HttpGet] public async Task<ActionResult> Get() { Encoding.RegisterProvider(CodePagesEncodingProvider.Instance); string xmlContent = "<?xml version=\"1.0\" encoding=\"GBK\" standalone=\"yes\"?><xml><version>1</version><ins_cd>08A9999999</ins_cd><mchnt_cd>0002900F0370588</mchnt_cd><term_id></term_id><random_str>93b4efa6d0d84808a76355ff0f7a178d</random_str><sign>G1+TBpyEVwsQjeJ9X7zrObRTFtI/ItuJWEEYl3AT/9XlFd844Jv2Wb/gNVkuEVP890Tf1Ub+EaTe1qByHSu97cpQr6riuDxqw2nnjKZBZsG00C1d8070sZPf4c1hkSUfhlR2nPn+7dvIanLCjRFzTgoTQ/WtcArrL/SJIJeaXYg=</sign><order_type>ALIPAY</order_type><goods_des>卡盟测试</goods_des><goods_detail></goods_detail><addn_inf></addn_inf><mchnt_order_no>2018121302054468584629</mchnt_order_no><curr_type></curr_type><order_amt>1</order_amt><term_ip>127.0.0.1</term_ip><txn_begin_ts>20181213020544</txn_begin_ts><goods_tag></goods_tag><auth_code>288232051781304899</auth_code><sence>1</sence><reserved_sub_appid></reserved_sub_appid><reserved_limit_pay></reserved_limit_pay></xml>"; xmlContent = UrlEncode(xmlContent, Encoding.GetEncoding("GBK")); Dictionary<string, string> nvs = new Dictionary<string, string> { { "req", xmlContent } }; Encoding encoding = Encoding.GetEncoding("GBK"); StringBuilder buffer = new StringBuilder(); int i = 0; IDictionary<string, string> sortedParams = new SortedDictionary<string, string>(nvs); foreach (KeyValuePair<string, string> kvp in nvs) { buffer.AppendFormat(i > 0 ? "&{0}={1}" : "{0}={1}", kvp.Key, UrlEncode(kvp.Value, Encoding.GetEncoding("GBK"))); i++; } byte[] postBody = encoding.GetBytes(buffer.ToString()); var client = _httpClientFactory.CreateClient("HttpClientFactoryDemo"); var request = new HttpRequestMessage { RequestUri = new Uri("https://spay.fuiou.com/commonQuery"), Method = HttpMethod.Post, Content = new ByteArrayContent(postBody), }; request.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded"); return Ok(await client.SendAsync(request)); } }}

总结

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