I have a web API application which when deployed in IIS server, PUT and DELETE methods alone does not work. But it works fine locally.

When I tried investigating more on various options like disabling WebDAV module and adding verbs in handlers. Nothing worked for me. When I change the application pool’s managed pipeline mode from Classic to Integrated, it works fine.

But my clients server has to be classic for all other the legacy applications to work. Is there any work around for this?

We are using IIS-10 and mine is not a .net core application. Its .net framework 4.5 application.

My Web.config looks like this:

<?xml version="1.0" encoding="utf-8"?>

<configuration>
  <connectionStrings>
    <add name="DBConnection" connectionString="*****" providerName="System.Data.SqlClient" />
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-12.0.0.0" newVersion="12.0.0.0" />
      </dependentAssembly>
      
    </assemblyBinding>
  </runtime>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
</configuration>