Setting Basic Auth Headers with .NET for PAPI-WS

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Clinton Davidson's Blog | August 2, 2006   3:28 PM | Comments (0)

Second, add the following code to the generated constructor for ProcessServiceService, and override the method GetWebRequest(Uri uri):

public ProcessServiceService()
{
  //set the web service endpoint- this could also be put into a setter method
  this.Url = PageBase.WEB_SERVICE_ENDPOINT;
  //add the basic auth credentials
  //the credentials could also be supplied in a setter method
  //or in an alternate constructor
  //be sure to add
  //using System.Net;
  //to recognize the class NetworkCredential
  NetworkCredential networkCredential = new NetworkCredential(PageBase.BASIC_AUTH_USERNAME,     PageBase.BASIC_AUTH_PASSWORD);
  Uri uri = new Uri(this.Url);
  ICredentials credentials =
  networkCredential.GetCredential(uri, "Basic");
  this.Credentials = credentials;
  //set preauthenticate to true, or the
  //credentials will not be supplied on the first request, and the //request will fail
  this.PreAuthenticate = true;
}

//despite the documentation, it is not enough to set preauthenticate
//to true. You must also override the GetWebRequest method
//to add the basic auth headers or they will not be supplied
//on the first request
protected override System.Net.WebRequest GetWebRequest(Uri uri)
{
  HttpWebRequest request;
  request = (HttpWebRequest)base.GetWebRequest(uri);

  if (PreAuthenticate)
  {
    NetworkCredential networkCredentials =
    Credentials.GetCredential(uri, "Basic");

    if (networkCredentials != null)
    {
      //be sure to add
      //using System.Text;
     //to recognize the class UTF8Encoding
      byte[] credentialBuffer = new UTF8Encoding().GetBytes(
      networkCredentials.UserName + ":" +
      networkCredentials.Password);
      request.Headers["Authorization"] ="Basic " + Convert.ToBase64String(credentialBuffer);
     }
    else
     {
      throw new ApplicationException("No network credentials");
     }
  }
  return request;
}

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