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Tweaking WCF to build highly scalable async REST API

, 31 Jul 2011
You can build async REST API using WCF but due to some bug in WCF implementation it does not scale as you would want it to. Here's my journey with Microsoft's WCF team to explore the problem and find the right fix.
<?xml version="1.0"?>
<configuration>
  <!--
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false"/>
    <httpErrors errorMode="Detailed">
    </httpErrors>
    <modules>
      <remove name="ServiceModel"/>
      <add name="MyAsyncWCFHttpModule" type="AsyncServiceLibrary.MyHttpModule" preCondition="managedHandler" />
    </modules>
  </system.webServer>
  -->
  <!--
  <system.diagnostics>
    <trace autoflush="false" indentsize="4">
      <listeners>
        <add name="myListener"
          type="System.Diagnostics.TextWriterTraceListener"
          initializeData="C:\Users\604422604\Documents\My Dropbox\OSProjects\WcfAsyncRestApi\WcfAsyncRestApi\App_Data\Log.txt" />
        <remove name="Default" />
      </listeners>
    </trace>
  </system.diagnostics>
  -->
	<system.web>
		<compilation debug="false"/>    
  </system.web>
  <system.net>
    <connectionManagement>
      <remove address="*"/>
      <add address="*" maxconnection="500"/>
    </connectionManagement>
  </system.net>
	<system.serviceModel>
    <diagnostics performanceCounters="ServiceOnly" />
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
    <behaviors>
      <endpointBehaviors>
        <behavior name="webHttpEnablingBehaviour">         
          <webHttp />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="defaultServiceBehavior">
          <serviceThrottling maxConcurrentCalls="100" maxConcurrentInstances="100" maxConcurrentSessions="100" />
          <serviceTimeouts transactionTimeout="00:01:00" />
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior> 
      </serviceBehaviors>
    </behaviors>
    <bindings>
      <webHttpBinding>
        <binding name="default" allowCookies="true" ></binding>
      </webHttpBinding>
    </bindings>
    <services>
      <service behaviorConfiguration="defaultServiceBehavior" name="WcfAsyncRestApi.AsyncService">
        <endpoint address="" behaviorConfiguration="webHttpEnablingBehaviour"
          binding="webHttpBinding" contract="WcfAsyncRestApi.AsyncService" />
      </service>
      <service behaviorConfiguration="defaultServiceBehavior" name="WcfAsyncRestApi.RegularService">
        <endpoint address="" behaviorConfiguration="webHttpEnablingBehaviour"
          binding="webHttpBinding" contract="WcfAsyncRestApi.RegularService" />
      </service>
    </services>
    </system.serviceModel>
</configuration>

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Web01 | 2.8.140721.1 | Last Updated 31 Jul 2011
Article Copyright 2011 by Omar Al Zabir
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