我在访问 wcf 服务时遇到了错误请求 400 的问题。我已经尝试了与该主题相关的所有解决方案，但仍未解决。Wcf 服务在 IIS7 上。
我正在尝试使用以下代码调用服务。
try
{
WebClient client = new WebClient();
byte[] data = client.DownloadData(ApplicationRunTimeSettings.ServiceURL() + userID);
Stream stream = new MemoryStream(data);
DataContractJsonSerializer obj = new DataContractJsonSerializer(typeof(string));
result = obj.ReadObject(stream).ToString();
}
catch (Exception)
{
}
return result;
服务配置文件如下，wcf 和 web 应用程序的配置文件相同。实际上 wcf 服务是在 web 应用程序和托管在 iis7 上的 web 应用程序中开发的，我们正在使用它访问服务。
配置文件如下。大多数情况下它不会返回错误，但它会在一段时间后中断。对 wcf 服务的请求很频繁。数据是 JSON 的形式。
现在，在对 serviceThrottling 进行以下建议的更改后，web.config 文件看起来如下所述，但有时它仍然会给出相同的错误。
<system.web>
<sessionState timeout="1440"/>
<customErrors mode="Off"/>
<httpRuntime executionTimeout="90" maxRequestLength="104857600" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100" enableVersionHeader="true"/>
<!--set compilation defug="false" when releasing-->
<compilation targetFramework="4.0" >
<assemblies>
<add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Web.WebPages, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</assemblies>
</compilation>
<authentication mode="Forms">
<forms loginUrl="~/Account/LogOn" timeout="86400"/>
</authentication>
<pages>
<namespaces>
<add namespace="System.Web.Helpers"/>
<add namespace="System.Web.Mvc"/>
<add namespace="System.Web.Mvc.Ajax"/>
<add namespace="System.Web.Mvc.Html"/>
<add namespace="System.Web.Routing"/>
<add namespace="System.Web.WebPages"/>
</namespaces>
</pages>
</system.web>
<system.webServer>
<security>
<requestFiltering>
<!-- maxAllowedContentLength = bytes -->
<requestLimits maxAllowedContentLength="104857600"/>
</requestFiltering>
</security>
<validation validateIntegratedModeConfiguration="false"/>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.serviceModel>
<services>
<service name="Glance.DynamicBusinessService.DynamicBusinessService" behaviorConfiguration="ServiceBehaviour">
<!-- Service Endpoints -->
<!-- Unless fully qualified, address is relative to base address supplied above -->
<endpoint address="customBinding" binding="customBinding" bindingConfiguration="basicConfig" contract="Glance.DynamicBusinessService.IDynamicBusinessService"/>
<endpoint address="" binding="webHttpBinding" contract="Glance.DynamicBusinessService.IDynamicBusinessService" behaviorConfiguration="REST">
<!--
Upon deployment, the following identity element should be removed or replaced to reflect the
identity under which the deployed service runs. If removed, WCF will infer an appropriate identity
automatically.
-->
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="throttleThis">
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="True" />
<serviceThrottling
maxConcurrentCalls="40"
maxConcurrentInstances="20"
maxConcurrentSessions="20"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="true"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="REST">
<webHttp/>
</behavior>
</endpointBehaviors>
</behaviors>
<bindings>
<webHttpBinding>
<binding maxReceivedMessageSize="999999999" receiveTimeout="24" closeTimeout="24" maxBufferPoolSize="999999999" maxBufferSize="999999999">
<readerQuotas maxDepth="32" maxStringContentLength="999999999" maxArrayLength="99999" maxBytesPerRead="4096" maxNameTableCharCount="99999" />
</binding>
</webHttpBinding>
<customBinding>
<binding name="basicConfig">
<binaryMessageEncoding/>
<httpTransport transferMode="Streamed" maxReceivedMessageSize="67108864"/>
</binding>
</customBinding>
</bindings>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" minFreeMemoryPercentageToActivateService="0"/>
</system.serviceModel>
</configuration>
感谢您的任何建议和帮助。