Correct Parameters for web service get command

[silversurfer5150]

I have enabled web services and have been calling to them through the browser with url as below which works fine:

http://localhost/prestashop/api/products/1'>http://localhost/prestashop/api/products/1

Now I 'm trying to retrieve access the SOAP object through the API. The function is below but without the documentation it is just a guessing game. I'm getting bad http requests tho so I know I'm sending something.

public function fetch($key, $method, $url, $params, $inputXml = NULL)

I want to make a GET request and have been trying something like:

$wr = WebserviceRequest::getInstance(); // get instance 
$result = $wr->fetch("access_key", GET,"http://localhost/prestashop/api/products/1", NULL, NULL); 

Obviously the access key is the one from the back office, GET is the method, the url here I have tried entering the entire thing as you do with the browser and I have also tried http://localhost/prestashop/api/products/ as $url and /1 as $params. Actually you name it I've tried it, any ideas folks?

thanks

Silversurfer