WCF REST 服务返回 405：jQuery AJAX GET 不允许的方法

Posted 2023-03-03

【中文标题】WCF REST 服务返回 405：jQuery AJAX GET 不允许的方法

【英文标题】：WCF REST service returns 405: method not allowed for jQuery AJAX GET

【发布时间】：2012-04-21 12:53:45

【问题描述】：

即使看完这篇文章 wcf REST Services and JQuery Ajax Post: Method not allowed (3)

我无法通过 405：尝试通过以下 AJAX 调用在我的 WCF REST 服务上调用方法时不允许使用方法：

$.ajax(
    type: "GET",
    url: 'http://mydomain.com/service1/service.svc/json/getsupportedagencies',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    failure: function (msg) 
        alert(msg);
    ,
    success: function (agencies) 
        alert("success via REST");
        $.each(agencies, function (i, a) 
            viewModel.agencies.push(new agency(a.Name, a.FullName));
        );
    
);

服务接口定义如下：

 [ServiceContract]
public interface IService1

    [OperationContract]
    [WebInvoke(Method = "GET",
        RequestFormat = WebMessageFormat.Json,
       ResponseFormat = WebMessageFormat.Json, UriTemplate = "getsupportedagencies")]
    AgencyDTO[] GetSupportedAgencies();

  // other methods

在跨域问题上遇到线程后，我手动在webservice项目中添加了一个Global.asax文件，同时添加了如下方法方法：

 protected void Application_BeginRequest(object sender, EventArgs e)
    
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin",
                         "http://localhost:80");

        if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
        
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods",
                          "GET, POST");
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers",
                          "Content-Type, Accept");
            HttpContext.Current.Response.AddHeader("Access-Control-Max-Age",
                          "1728000");
            HttpContext.Current.Response.End();
        

    

我在 web.config 中的服务模型配置如下：

<system.serviceModel>       
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />     
        <services>
            <service behaviorConfiguration="ServiceBehavior" name="Services.Service1">
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
                <endpoint address="basic" binding="basicHttpBinding" contract="Services.Contracts.IService1" />
                <endpoint address="json" 
                    behaviorConfiguration="JsonBehavior"
                    binding="webHttpBinding" 
                    contract="Services.Contracts.IService1" />
            </service>   
        </services>
        <behaviors>
        <endpointBehaviors>
            <behavior name="JsonBehavior">
                <webHttp />
            </behavior>
        </endpointBehaviors>
    <serviceBehaviors>
    <behavior name="ServiceBehavior">
     <serviceMetadata httpGetEnabled="true" />
     <serviceDebug includeExceptionDetailInFaults="true" />
    </behavior>
   </serviceBehaviors>
  </behaviors>      
    </system.serviceModel>

我使用以下代码对服务进行的单元测试通过了：

[Test]
 public void TestGetAgencyForLocation()
       
           var client = new WebClient();

           var response = client.DownloadString(
                  "http://mydomain.com/service1/service.svc/json/getsupportedagencies");
           Assert.IsTrue(!string.IsNullOrEmpty(response));

           var agencies= JsonConvert.DeserializeObject(response);
           Assert.IsNotNull(agencies);
       

如果我在 Chrome 或 IE 中发布 URL“http://mydomain.com/service1/service.svc/json/getsupportedagencies”，我会得到 JSON 格式的正确服务器响应。

是的，所有这些都到位后，我仍然得到 405: method not allowed。

TIA。

【问题讨论】：

谢谢你用“HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST");"这一行解决了我的问题

【参考方案1】：

我通过在 WCF 项目 Global.asax 文件中添加以下代码解决了这个问题

protected void Application_BeginRequest(object sender, EventArgs e)
        
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
            if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
            
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "POST, PUT, DELETE");

                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
                HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
                HttpContext.Current.Response.End();