asp.net后台 怎么发送http请求？
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这个后台发送http请求有什么用？希望能帮我写个小例子
参考技术A public static HttpWebResponse GetResponseStream(string url, string method, string requestContentType, string userAgent, Dictionary<string, string> head, string data, Encoding requestEnc)HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = method;
request.ContentType = requestContentType;
request.Timeout = 10000;//10秒
request.UserAgent = userAgent;
if (head != null && head.Count > 0)
foreach (var item in head)
request.Headers.Add(item.Key, item.Value);
if (string.IsNullOrEmpty(data) == false)
byte[] dataByte = requestEnc.GetBytes(data);
request.ContentLength = dataByte.Length;
Stream writer = request.GetRequestStream();
writer.Write(dataByte, 0, dataByte.Length);
writer.Close();
try
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
return response;
catch (WebException)
return null;
// throw new Exception(string.Format("message:0;status:1;url:2;data:3", ex.Message, ex.Status, url, data));
public static string GetResponseText(string url, string method, string requestContentType, string userAgent, Dictionary<string, string> head, string data, Encoding requestEnc)
HttpWebResponse response = GetResponseStream(url, method, requestContentType, userAgent, head, data, requestEnc);
if (response != null)
Encoding responseEnc = Encoding.UTF8;
if (!string.IsNullOrEmpty(response.CharacterSet))
responseEnc = Encoding.GetEncoding(response.CharacterSet);
StreamReader sr = new StreamReader(response.GetResponseStream(), responseEnc);
return sr.ReadToEnd();
return "";
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麻烦给我讲讲他的作用好吗？谢谢！
从 Angular 向 Asp.net 发送 post 请求时出现错误 405
【中文标题】从 Angular 向 Asp.net 发送 post 请求时出现错误 405【英文标题】：Error 405 when sending post request from Angular to Asp.net 【发布时间】：2019-04-20 05:46:12 【问题描述】：我正在尝试从 Angular 前端向 ASP.net 后端发送发布请求。
获取请求工作正常。
当我发送时：
this.http.post("http://localhost:3000/api/Cards", "一些数据", httpOptions).subscribe(res => this.display(res));
对于我从 VS2017 运行的 ASP.NET API，我得到：
ERROR …error: Object 消息：“请求的资源不支持 http 方法 'POST'。” headers: Object normalizedNames: Map(0),lazyUpdate: null,lazyInit:lazyInit() 消息：“http://localhost:3000/api/Cards 的 Http 失败响应：405 Method Not Allowed”名称：“HttpErrorResponse”ok：false status: 405statusText: "Method Not Allowed"url: "http://localhost:3000/api/Cards": Object constructor: HttpErrorResponse() core.js:12584
对于 Angular，“httpOptions”包括：
常量 httpOptions = 标头：新的 HttpHeaders( “内容类型”：“文本/纯文本”， “接受”：“文本/纯文本” );
我的 WebApi.Config：
<configuration>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.6.1" />
<httpRuntime targetFramework="4.6.1" />
<httpModules>
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
</httpModules>
</system.web>
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Headers" value="Content-type"/>
<add name="Access-Control-Allow-Methods" value="POST"/>
<add name="Access-Control-Allow-Origin" value="*"/>
</customHeaders>
</httpProtocol>
<handlers>
<remove name="WebDAV"/>
<remove name="UrlRoutingModule-4.0" />
<add name="UrlRoutingHandler" preCondition="integratedMode" verb="*" path="UrlRouting.axd" type="System.Web.HttpForbiddenHandler, System.Web,Version=2.0.0.0, Culture=neutral,PublicKeyToken=<REMOVED>"/>
<add name="UrlRoutingModule-4.0" path="*" verb="*" type="System.Web.Routing.UrlRoutingModule" preCondition="" />
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />
<!--<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />-->
</handlers>
<modules runAllManagedModulesForAllRequests="true">
<remove name="TelemetryCorrelationHttpModule" />
<add name="TelemetryCorrelationHttpModule" type="Microsoft.AspNet.TelemetryCorrelation.TelemetryCorrelationHttpModule, Microsoft.AspNet.TelemetryCorrelation" preCondition="integratedMode,managedHandler" />
<remove name="ApplicationInsightsWebTracking" />
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
<remove name="WebDAVModule"/>
<remove name="UrlRoutingModule"/>
<add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</modules>
<validation validateIntegratedModeConfiguration="false" />
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" />
<bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Diagnostics.DiagnosticSource" publicKeyToken="cc7b13ffcd2ddd51" />
<bindingRedirect oldVersion="0.0.0.0-4.0.2.1" newVersion="4.0.2.1" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-11.0.0.0" newVersion="11.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.4.0" newVersion="5.2.4.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-5.2.6.0" newVersion="5.2.6.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-5.2.6.0" newVersion="5.2.6.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+" />
</compilers>
</system.codedom>
</configuration>
它可能看起来很混乱，因为我尝试了许多不同的 Stack Overflow 问题和 asp.net 论坛帖子的解决方案。似乎没有什么能摆脱 405 错误。
WebApiConfig.cs：
public static class WebApiConfig
public static void Register(HttpConfiguration config)
// Web API configuration and services
config.EnableCors();
// Web API routes
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/controller/id",
defaults: new id = RouteParameter.Optional
);
控制器：
[EnableCors(origins: "*", headers: "*", methods: "*")]
public class CardsController : ApiController
// Test data set
private Card[] cards = new Card[]
new Card Id = 1, Suit = "D", Value = "7",
new Card Id = 1, Suit = "D", Value = "K",
new Card Id = 1, Suit = "S", Value = "A",
new Card Id = 1, Suit = "H", Value = "2",
new Card Id = 1, Suit = "S", Value = "10"
;
// GET: api/Cards
[ResponseType(typeof(IEnumerable<Card>))]
public IEnumerable<Card> Get()
return cards;
// GET: api/Cards/5
public string Get(int id)
return "value";
// POST: api/Cards
public HttpResponseMessage Post(string value)
return Request.CreateResponse("You found me!");
// PUT: api/Cards/5
public void Put(int id, [FromBody]string value)
// DELETE: api/Cards/5
public void Delete(int id)
如果我遗漏了任何重要内容，请告诉我。
【问题讨论】：
尝试将[HttpPost] 置于Post 操作方法之上。
这是我的新发布方法，但我仍然收到 405 错误。 [HttpPost] public HttpResponseMessage Post(string value) return Request.CreateResponse("你找到我了！");
调用时会发生什么：this.http.post("http://localhost:3000/api/Cards", value: "some data" , httpOptions).subscribe(res => this.display(res)); 由于您正在发布，它可能会将“一些数据”序列化为与端点上的字符串值不匹配的对象。
我把它改成了上面的，仍然得到 405 错误。我很确定我的请求没问题，我用ptsv2.com 对其进行了测试。不过还是谢谢。
【参考方案1】：
您应该在 Asp.net 的端点上添加 [HttpPost]，如下所示：
[HttpPost] public ActionResult MyAction()
【讨论】：
【参考方案2】：你需要告诉控制器它是一个帖子 在动作上方添加声明。
[HttpPost]
public ActionResult MyAction()
在您的控制器操作之上。
【讨论】：
【参考方案3】：我改用 Ruby on Rails 作为后端。
【讨论】：
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