Using HTTP Get with XML web services

I'm using the following in a button click:

NSString *queryString =
    [NSString stringWithFormat:@"", userID.text];
    NSURL *url = [NSURL URLWithString:queryString];
    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
    [req addValue:@"text/xml; charset=utf-8"
    [req addValue:0 forHTTPHeaderField:@"Content-Length"];
    [req setHTTPMethod:@"GET"];  

 conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
    if (conn) {
        [activityIndicator startAnimating];
        webData = [[NSMutableData data] retain];

But when I write to the log in the connectiondidfinishloading method I recieve the following HTTP error:
        <title>Request format is unrecognized for URL unexpectedly ending in '/ValidateUserID'.</title>
         body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
         p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
         b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
         H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
         H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
         pre {font-family:"Lucida Console";font-size: .9em}
         .marker {font-weight: bold; color: black;text-decoration: none;}
         .version {color: gray;}....

Any help would be great.
Who is Participating?
Dave BaldwinFixer of ProblemsCommented:
Unless you have 'rewrite' working on that server, you need an extension on the filename to make it complete like:
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