Question

更新：我在Build 2013，Mark Simms看了这个，并确认离开路由器的HTTP请求确实有一个＆＃34; Body＆＃34;在请求中。他认为这是由于Get到达SB，然后打包被路由，然后包再次作为Messsage类型管理，然后再将其发回。在打包和路由之间，属性留在请求的主体中 - 这违反了＆＃34; GET＆＃34;的协议。但是，所有这些都存在于.NET框架中的.NET框架中或ServiceBus中。由于正文是不可变的（至少我找不到改变它的方法），唯一的方法是复制请求，然后在出路时更新原始请求。

这是路由应用程序的一小部分，它从Azure ServiceBus端点接收HTTP GET / POST请求，通过中继通道将其关闭到我的本地工作站，在那里我重写URL，并将其发送给我本地网络服务。

这是接口 - 通用，以便它可以接收对控制器/操作URL的任何类型的调用

  // The Router, and general concept of how to recieve from the SB and redirect was taken from
  // Tony Sneed Blog - which he documented here: http://blog.tonysneed.com/2012/04/24/roll-your-own-rest-ful-wcf-router/
  //
    [ServiceContract(Namespace = "urn:Twiddler")]
    public interface IRoutingService
    {
        [WebInvoke(UriTemplate = "")]
        [OperationContract(AsyncPattern = true, Action = "*", ReplyAction = "*")]
        IAsyncResult BeginProcessRequest(Message requestMessage, AsyncCallback asyncCallback, object asyncState);

        Message EndProcessRequest(IAsyncResult asyncResult);
    }
}

以下是代码：

[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall,
     AddressFilterMode = AddressFilterMode.Any, ValidateMustUnderstand = false)]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class RoutingService : IRoutingService, IDisposable
{
  private IRoutingService _client;

  /// <summary>
  /// when a message is received from the SB, it arrives here as simply a message - 
  /// </summary>
  /// <param name="requestMessage"></param>
  /// <param name="asyncCallback"></param>
  /// <param name="asyncState"></param>
  /// <returns></returns>
  public IAsyncResult BeginProcessRequest(Message requestMessage, AsyncCallback asyncCallback, object asyncState)
  {
    string RequestMessageAction = requestMessage.Headers.Action;

    IAsyncResult asyncResult = null;


    //if the full URI for the namespace does not match the one contructed in Twiddler, then pass it through - we have nothing to do with it!
    if (requestMessage.Headers.To.AbsoluteUri.Contains(Utilities.ServiceFormBridge.NameSpaceName) && requestMessage.Headers.To.AbsoluteUri.Contains(Utilities.ServiceFormBridge.EndPointName) == false)
      return asyncResult;

    //as the service bus will accept anything in terms of controllers and actions, we only need alter the DestinationAddress.Authority (host and port)
    var RewriteTheURL = requestMessage.Headers.To.AbsoluteUri.Replace(string.Format("http://{0}.servicebus.windows.net/{1}/", ServiceFormBridge.NameSpaceName, ServiceFormBridge.EndPointName), ServiceFormBridge.DestinationWebSite);

    Uri DestinationAddress = new Uri(RewriteTheURL);

    System.ServiceModel.ChannelFactory<IRoutingService> factory = null;

    factory = new ChannelFactory<IRoutingService>(new WebHttpBinding(), DestinationAddress.AbsoluteUri);

    WebHeaderCollection httpHeaders = WebOperationContext.Current.IncomingRequest.Headers;
    httpHeaders.Remove("Host");
    httpHeaders.Add("Host", DestinationAddress.Authority); //give it the new host that we are re-directing to

    httpHeaders.Remove("Connection");  //todo: not sure I need this, but without it there is an exception between Keep-Alive and Closed

    // Set factory and message address
    factory.Endpoint.Address = new EndpointAddress(DestinationAddress);
    requestMessage.Headers.To = DestinationAddress;


    _client = factory.CreateChannel();

    asyncResult = _client.BeginProcessRequest(requestMessage, asyncCallback, asyncState);

    return asyncResult;
  }
}

在BeginProcessRequest上，我得到一个例外：违反协议：无法使用此动词类型

发送内容正文

我已经研究过，据我所知，根据GET请求，请求正文中不能包含任何内容。

由于我的代码适用于POST，我只能假设由于某种原因，身体中存在某些东西。

但是，由于原始请求是使用ServiceBus的URL从浏览器获取的GET，我不确定为什么身体中会有任何内容。

所以：

我想我在代码中做了一些导致我出问题的事情 - 如果是这样我想知道什么！
如果收到的请求中有内容，我该如何删除它以便我不会收到违规行为？
对代码的任何其他建议，改进？

Answer 1

在操作上放置此属性，[WebInvoke（UriTemplate =“”）]默认支持POST，但是您可以传递指定其他谓词的参数，例如PUT，DELETE等。但是，GET支持不同的属性，[WebGet]。我建议在路由器上添加额外的操作，一个用WebGet，另一个用WebInvoke和不同的HTTP动词。

违反协议 - 动词不允许内容类型

1 个答案: