Hi,

I am invoking a php web service though apex code. I am able to invoke my php web service by php client but I am not able to invoke it through apex.  I am setting header for authentication as :

        HttpRequest req = new HttpRequest();
        req.setEndpoint('http://serverurl/file.php?wsdl');
        req.setMethod('GET');
        Blob headerValue = Blob.valueOf(username + ':' + password);
        String authorizationHeader = 'Basic '+ EncodingUtil.base64Encode(headerValue);
        req.setHeader('Authorization', authorizationHeader);
        req.setHeader('Content-Type', 'application/soap+xml');

I am able to get  soap (wsdl) by "System.debug(res.getBody()); " command but   I am getting following error "System.CalloutException: Web service callout failed:"   

My webservice.invoke method is as:

            WebServiceCallout.invoke(
              this,
              request_x,
              response_map_x,
              new String[]{endpoint_x,
              'http://test-uri/soap/export/getUsers',
              'http://test-uri/soap/export/',
              'getUsers',
              'http://test-uri/soap/export/',
              'getUsersResponse',
              'testUriSoapExport.getUsersResponse_element'}

            );

Is this error due to authentication ?  How can I resolve it ?

Thanks,

Varun