jQuery $ .ajax对WCF服务的调用返回400 Bad Request

Question

(最后更新)

我正在研究一种使用不熟悉技术的想法.我写了一些WCF服务,但我从未做过任何高级配置.这是我第一次深入了解jQuery.前提是我创建一个WCF服务来获取分支信息,由jQuery检索.

我的第一次搜索产生了这个页面:http://www.codeproject.com/KB/aspnet/WCF_JQUERY_ASMX.aspx#2我正在使用它作为我的代码的基础.我最初是作为一个跨站点设置开始的,我摆脱了,看看我是否可以让这个东西工作.我搜索了堆栈溢出,没有帖子解决了我的400 Bad Request问题.

我的web.config中的代码:

<system.serviceModel>
<behaviors>
  <serviceBehaviors>
    <behavior name="GeoDataBehavior">
      <serviceMetadata httpGetEnabled="true" />
      <serviceDebug includeExceptionDetailInFaults="true" />
    </behavior>
    <behavior name="">
      <serviceMetadata httpGetEnabled="true" />
    </behavior>
  </serviceBehaviors>
  <endpointBehaviors>
    <behavior name="GDEPBehavior">
      <webHttp />
    </behavior>
  </endpointBehaviors>
</behaviors>
<bindings>
  <webHttpBinding>
    <binding name="GDBinding" crossDomainScriptAccessEnabled="true"/>
  </webHttpBinding>
</bindings>
<services>
  <service behaviorConfiguration="GeoDataBehavior" name="GeoDataService">
    <endpoint address="" 
              binding="webHttpBinding" contract="IGeoDataService"
               behaviorConfiguration="GDEPBehavior"/>
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
  </service>
</services>

我界面的代码:

[ServiceContract]
public interface IGeoDataService
{
    [OperationContract]
    [WebInvoke(Method = "POST",
        BodyStyle = WebMessageBodyStyle.Wrapped,
        ResponseFormat = WebMessageFormat.Json)]
    List<BranchData> GetBranches();
}


// Use a data contract as illustrated in the sample below to add composite types to service operations.
[DataContract]
public class BranchData
{
    [DataMember]
    public string BranchNumber { get; set; }

    [DataMember]
    public string BranchName { get; set; }

    [DataMember]
    public string StreetAddress { get; set; }

    [DataMember]
    public string City { get; set; }

    [DataMember]
    public string Zip { get; set; }

    [DataMember]
    public string State { get; set; }

    [DataMember]
    public string Phone { get; set; }

    [DataMember]
    public string County { get; set; }
}

jQuery脚本:

 <script type="text/javascript" language="javascript" src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.6.1.js">
</script>
<script type="text/javascript" language="javascript">
    /* help from http://www.codeproject.com/KB/aspnet/WCF_JQUERY_ASMX.aspx
    */
    var varType;
    var varUrl;
    var varData;
    var varContentType;
    var varDataType;
    var varProcessData;

    function CallService() {
        // Thank you Bing: http://blueonionsoftware.com/blog.aspx?p=03aff202-4198-4606-b9d6-686fd13697ee
        jQuery.support.cors = true;


        $.ajax({
            type: varType,
            url: varUrl,
            data: null,
            crossDomain: true,
            contentType: varContentType,
            dataType: varDataType,
            processdata: varProcessData,
            success: function (msg) {
                ServiceSucceeded(msg);
            },
            error: ServiceFailed
        });

        /*
        $.getJSON(varUrl, null, function (msg) {
            ServiceSucceeded(msg);
        });
        */
    }

    function GetBranchDataJson() {
        varType = "POST";
        varUrl = "GeoDataService.svc/GetBranches";
        varData = "";
        varContentType = "application/json; charset=utf-8";
        varDataType = "json";
        varProcessData = true;
        CallService();
    }

    function ServiceSucceeded(result) {
        var ddlResult = document.getElementById("ddlResult");
        for (var j = ddlResult.options.length - 1; j >= 0; j--) { ddlResult.remove(j); }

        for (var i = 0; i < result.length; i++) {
            var opt = document.createElement("option");
            opt.text = result[i].BranchName;
            ddlResult.options.add(opt);
        }
    }

    function ServiceFailed(jqXHR, errorType, errorThrown) {
        alert('error!\n' + jqXHR + '\n' + errorType + '\n' + errorThrown);
    }

</script>
<input name="WTF" type="button" onclick="GetBranchDataJson()" />

你会注意到我正在使用jQuery 1.6.1,而不是教程中的1.3.教程在我的盒子上正常运行并按预期完成所有操作.不幸的是,我的代码没有.我感谢您提供的任何帮助.

哦,这是Fiddler请求的副本:

POST http://localhost:16062/GeoDataService.svc/GetBranches HTTP/1.1
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/json; charset=utf-8
Referer: http://localhost:16062/Default.aspx
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
Host: localhost:16062
Content-Length: 0
Connection: Keep-Alive
Pragma: no-cache

更新:好的,我传递了"{}"作为数据查询(显然这是向不带参数的方法传递任何内容的正确方法),现在我得到了不支持的媒体类型.跟踪异常是:System.ServiceModel.ProtocolException:Content Type application/json; charset = utf-8被发送到期望text/xml的服务; 字符集= UTF-8.

Answer 1

调用本身似乎没有任何问题 - 您应该尝试启用跟踪以查看为什么WCF正在考虑传入的请求是坏的.我尝试了类似的代码(见下文),它工作得很好.此外,由于请求来自与服务相同的域(localhost:16062),因此您没有任何跨域问题.

更新:基于问题的评论主题的解决方案

web.config中<service>元素的"name"属性必须与服务类的完全限定名称(即命名空间+名称)匹配(即,.svc文件中使用的相同值).否则,您将获得为您的服务添加的默认端点,可能是您想要的也可能不是 - 默认情况下,您获得的是BasicHttpBinding端点,这不是您想要的.

这个问题是.NET Framework 4.0中添加的功能的一个不幸的副作用:简化配置.在.NET 3.5之前,每个服务都需要在web.config上有一个条目来配置它,甚至最简单的应用程序(即hello world)的配置文件都很大.所以,从4.0开始,如果WCF找不到名称与服务的完全限定名称匹配的服务元素,它会很高兴地认为您要使用默认配置.这就是为什么它首先与WcfTestClient"合作".

public class StackOverflow_6526659
{
    [ServiceContract]
    public interface IGeoDataService
    {
        [OperationContract]
        [WebInvoke(Method = "POST",
            BodyStyle = WebMessageBodyStyle.Wrapped,
            ResponseFormat = WebMessageFormat.Json)]
        List<BranchData> GetBranches();
    }

    public class Service : IGeoDataService
    {
        public List<BranchData> GetBranches()
        {
            return new List<BranchData>();
        }
    }

    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    [DataContract]
    public class BranchData
    {
        [DataMember]
        public string BranchNumber { get; set; }

        [DataMember]
        public string BranchName { get; set; }

        [DataMember]
        public string StreetAddress { get; set; }

        [DataMember]
        public string City { get; set; }

        [DataMember]
        public string Zip { get; set; }

        [DataMember]
        public string State { get; set; }

        [DataMember]
        public string Phone { get; set; }

        [DataMember]
        public string County { get; set; }
    }

    public static void Test()
    {
        string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
        ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
        WebHttpBinding binding = new WebHttpBinding { CrossDomainScriptAccessEnabled = true };
        WebHttpBehavior behavior = new WebHttpBehavior();
        host.AddServiceEndpoint(typeof(IGeoDataService), binding, "").Behaviors.Add(behavior);
        host.Open();
        Console.WriteLine("Host opened");

        HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(baseAddress + "/GetBranches");
        req.Method = "POST";
        req.GetRequestStream().Close();
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Console.WriteLine("HTTP/{0} {1} {2}", resp.ProtocolVersion, (int)resp.StatusCode, resp.StatusDescription);
        foreach (var header in resp.Headers.AllKeys)
        {
            Console.WriteLine("{0}: {1}", header, resp.Headers[header]);
        }
        if (resp.ContentLength > 0)
        {
            Console.WriteLine(new StreamReader(resp.GetResponseStream()).ReadToEnd());
        }

        Console.Write("Press ENTER to close the host");
        Console.ReadLine();
        host.Close();
    }
}