我有一个 C# WebService 设置来返回 JSON 信息以在移动设备上使用。一切正常,除了现在抛出“HTTP 错误 502(坏网关):网关或代理服务器从上游服务器收到无效响应”的调用之一。
当我增加调用返回的数据时,错误就开始了。数据是从驻留在服务器上的 JSON 文件中读取的。这个数据文件的大小以前是 1,324,859 字节,它工作正常(现在仍然如此),新的数据文件是 1,563,570 字节,这是失败的。
似乎很明显,我达到了某种默认限制,即我可以在一次调用中返回多少,但对于像我这样的人来说,我无法弄清楚如何增加这个限制。谷歌搜索指向设置 maxJsonLength 的方向,但这似乎没有任何效果。
下面是 WebService 的深入代码,更重要的是我的 web.config。我应该说调用在本地运行良好,这意味着在 VS2010 中运行时,但在服务器上失败(运行 IIS 7.5 的 GearHost)。
我是配置/设置 IIS 的新手,因此非常感谢任何帮助。
[ServiceContract]
public interface IMyService
{
[OperationContract]
[WebInvoke(Method = "GET", UriTemplate = "/GetItems", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
Item[] GetItems();
}
public class MyService : IMyService
{
public Item[] GetItems()
{
var result = ReadDataFile<List<Item>>(DataType.Items);
return result == null ? null : result.ToArray();
}
}
我现在已经尝试了很多设置,我什至不确定这里需要什么,什么不应该......
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
<sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
<section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere" />
<section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
<section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
<section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication" />
</sectionGroup>
</sectionGroup>
</sectionGroup>
</configSections>
<system.web>
<customErrors mode="On"/>
<compilation debug="true" targetFramework="4.0" />
<caching>
<outputCacheSettings>
<outputCacheProfiles>
<add name="NoCacheProfile" noStore="true" duration="0" varyByParam="none" enabled="true"/>
</outputCacheProfiles>
</outputCacheSettings>
</caching>
</system.web>
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="StreamedRequestWebBinding"
bypassProxyOnLocal="true"
useDefaultWebProxy="false"
hostNameComparisonMode="WeakWildcard"
sendTimeout="10:15:00"
openTimeout="10:15:00"
receiveTimeout="10:15:00"
maxReceivedMessageSize="2147483647"
maxBufferSize="2147483647"
maxBufferPoolSize="2147483647"
transferMode="StreamedRequest">
<readerQuotas maxArrayLength="2147483647"
maxStringContentLength="2147483647" />
</binding>
</webHttpBinding>
</bindings>
<services>
<service name="JSON_WebService.WoWService" behaviorConfiguration="ServiceBehaviour">
<endpoint address ="" binding="webHttpBinding" bindingConfiguration="StreamedRequestWebBinding" contract="JSON_WebService.IWoWService" behaviorConfiguration="web">
</endpoint>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehaviour">
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="web">
<webHttp/>
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50000000"/>
</webServices>
</scripting>
</system.web.extensions>
</configuration>