如何在调试时查看wcf rest服务返回的400 http错误请求的原因

您可以尝试在rest服务的错误中包含异常

catch (Exception ex)
            {
                Log.Fatal("Could not complete process", ex);
                throw new WebFaultException<string>(
                       string.Format(ex.Message),
                            HttpStatusCode.BadRequest);
            }

上面的代码将处理这两种情况,假设您启用了日志记录器,您只需获取服务器上的日志文件,客户端就会收到异常消息

我想你可以给客户端发送一条友好的消息,这样他们就不会关心你的具体实现,或者创建一个你可以调用的类

WebFaultException &T;

用。

编辑2

如果在收到请求之前遇到问题,可以尝试以下操作

向服务添加faulthandler

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
    public class GenericErrorHandlingBehavior : Attribute, IErrorHandler, IServiceBehavior
    {
        public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
        {
            //throw new NotImplementedException();
        }

        public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
        {
            //throw new NotImplementedException();
            // Adds a CoreServiceBehavior to each ChannelDispatcher
            foreach (var channelDispatcherBase in serviceHostBase.ChannelDispatchers)
            {
                var channelDispatcher = channelDispatcherBase as ChannelDispatcher;
                channelDispatcher.ErrorHandlers.Add(new GenericErrorHandlingBehavior());
            }
        }

        public bool HandleError(Exception error)
        {
            //throw new NotImplementedException();
            return true;
        }

        public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
        {
            if (error is FaultException)
                return;//nothing to do if the error is a fault

            //the type cannot be determined[ default to this value]
            var exception = new FaultException<GenericServiceFault>(
                new GenericServiceFault(), new FaultReason(error.Message));

            MessageFault messageFault = exception.CreateMessageFault();
            fault = Message.CreateMessage(version, messageFault, exception.Action);

        }

        public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
        {
            //throw new NotImplementedException();
        }
    }

这个 GenericServiceFault 类只是一个简单的datacontract类, 然后您可以在 ProvideFaultMethod ,或者 HandleError 方法并向用户提供有意义的错误

你可以使用 GenericErrorHandlingBehavior 将服务实现作为属性,即[genericerrorhandlingbehavior]