service wcf renvoie la “méthode ne permet pas” d'erreur

Je suis en train de passer de paramètre de l'objet en tant que format json à wcf service restful.

service conratc code comme celui-ci;

[WebInvoke(
    Method = "POST",
    BodyStyle = WebMessageBodyStyle.Wrapped,
    ResponseFormat = WebMessageFormat.Json,
    RequestFormat = WebMessageFormat.Json,
    UriTemplate="PR")]
[OperationContract]
TWorkRequestPostResult PostRequest(TWorkRequestPostArgs args);

Et de mon site web.fichier de config comme ceci;

<system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" />
          <!-- 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>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="WebDAVModule"/>
    </modules>
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directoryBrowse enabled="true" />
  </system.webServer>  

Quand j'essaie d'appeler le service "http://localhost/serviceurl/PR" l'url, le Service rendu "Méthode non autorisée" message d'erreur.