jQuery Ajax to asp.net asmx web service throws Request format is invalid: application/json

Question

I have jquery call an asp.net webservice with an integer. On our legaacy application which was ported to .net 4.0 I cannot get this call to work. I can call a method which h

Answer 1

DOH, I was working in the wrong web.config.

Like a lot of questions on SO the solution was to add the following.

<system.webServer>
        <handlers>
            <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
            <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        </handlers>
  </system.webServer>

Answer 2

I had the same problem and ending up running this command...

C:\Windows\Microsoft.NET\Framework64\v4.0.30319>aspnet_regiis.exe -i

Note that you will need your command prompt in Administrator mode for it to work.