I am trying to access fedex rate service. I am using the folowing code. BUt in response I get the same envelope which I send. PLease have a look and help.

thanks

public class FedexSoap{

    public static String result {set;get;}
   

   // @Future(callout=true)
    public static void makeCallout(){
        System.Debug('*******Starting Callout*******');
       
         // Instantiate a new http object
        Http h = new Http();
             
        // Instantiate a new HTTP request, specify the method (GET) as well as the endpoint
        HttpRequest req = new HttpRequest();
           
        //get the Opportunity
        //Opportunity opportunity = [Select Id, OwnerId, Name, CloseDate, Probability from Opportunity where Id = :opportunityID];
       
        // The webservice url -  Pass in the endpoint to be used using the string url
        String url = 'https://gatewaybeta.fedex.com:443/web-services/rate';
        String soapXML;   
/*soapXML='<?xml version=' + '\''+ '1.0' + '\'' + ' encoding=' + '\''+ 'utf-8' + '\''+'?><SOAP-ENV:Envelope xmlns:SOAP-ENV=' + '\''+ 'http://schemas.xmlsoap.org/soap/envelope/'  + '\'' + ' xmlns:SOAP-ENC=' + '\''+'http://schemas.xmlsoap.org/soap/encoding/'  + '\'' + ' xmlns:xsi=' + '\''+'http://www.w3.org/2001/XMLSchema-instance' + '\'' + ' xmlns:xsd=' + '\''+' http://www.w3.org/2001/XMLSchema' + '\'' + ' xmlns=' + '\''+'http://fedex.com/ws/ship/v7' + '\'' + '>';   
soapXML += '<SOAP-ENV:Body><DeleteTagRequest><WebAuthenticationDetail><UserCredential><Key>8QyzKOB2JN2W4GTc</Key><Password>Rlql9MIEJqzN2Nqcz4qGE6MGq</Password>';
soapXML += '</UserCredential></WebAuthenticationDetail><ClientDetail><AccountNumber>510087224</AccountNumber><MeterNumber>118502046</MeterNumber></ClientDetail>';
soapXML += '<TransactionDetail><CustomerTransactionId>DE_Shakeout_wsvc</CustomerTransactionId></TransactionDetail><Version><ServiceId>ship</ServiceId>';
soapXML += '<Major>7</Major><Intermediate>0</Intermediate><Minor>0</Minor></Version><DispatchLocationId>MQYA</DispatchLocationId><DispatchDate>2008-10-08</DispatchDate><Payment>';
soapXML='<?xml version=' + '\''+ '1.0' + '\'' + ' encoding=' + '\''+ 'utf-8' + '\''+'?><SOAP-ENV:Envelope xmlns:SOAP-ENV=' + '\''+ 'http://schemas.xmlsoap.org/soap/envelope/'  + '\'' + ' xmlns:SOAP-ENC=' + '\''+'http://schemas.xmlsoap.org/soap/encoding/'  + '\'' + ' xmlns:xsi=' + '\''+'http://www.w3.org/2001/XMLSchema-instance' + '\'' + ' xmlns:xsd=' + '\''+' http://www.w3.org/2001/XMLSchema' + '\'' + ' xmlns=' + '\''+'http://fedex.com/ws/ship/v7' + '\'' + '>'; */  

soapXML =  '<?xml version=' + '\''+ '1.0' + '\'' + ' encoding=' + '\''+ 'utf-8' + '\''+'?><SOAP-ENV:Envelope xmlns:SOAP-ENV=' + '\''+ 'http://schemas.xmlsoap.org/soap/envelope/'  + '\'' + ' xmlns:SOAP-ENC=' + '\''+'http://schemas.xmlsoap.org/soap/encoding/'  + '\'' + ' xmlns:xsi=' + '\''+'http://www.w3.org/2001/XMLSchema-instance' + '\'' + ' xmlns:xsd=' + '\''+' http://www.w3.org/2001/XMLSchema' + '\'' + ' xmlns=' + '\''+'http://fedex.com/ws/ship/v7' + '\'' + '>';   
soapXML += '<SOAP-ENV:Body><RateRequest><WebAuthenticationDetail><UserCredential><Key>8QyzKOB2JN2W4GTc</Key><Password>Rlql9MIEJqzN2Nqcz4qGE6MGq</Password>';
soapXML += '</UserCredential></WebAuthenticationDetail><ClientDetail><AccountNumber>510087224</AccountNumber><MeterNumber>118502046</MeterNumber></ClientDetail>';
soapXML += '<Shipper><Address><StreetLines>Sender Address Line 1</StreetLines><City>Sender city</City>';
SOAPxml += '<StateOrProvinceCode>TN</StateOrProvinceCode><PostalCode>38115</PostalCode>';
soapXML += '<CountryCode>US</CountryCode></Address></Shipper><Recipient><Address><StreetLines>Recipient Address Line 1</StreetLines>';
soapXML += '<City>Recipient City</City><StateOrProvinceCode>PQ</StateOrProvinceCode><PostalCode>H1E1A1</PostalCode>';
soapXML += '<CountryCode>CA</CountryCode></Address></Recipient><PackagingType>YOUR_PACKAGING</PackagingType>';
soapXML += '</RateRequest></SOAP-ENV:Body></SOAP-ENV:Envelope>';

        req.setBody(soapXML);
        req.setEndpoint(url);
        req.setMethod('POST');
        req.setHeader('Content-length', '1753' );
        req.setHeader('Content-Type', 'text/xml;charset=UTF-8'); 
        req.setHeader('SOAPAction','getRates');
        req.setHeader('Host','gatewaybeta.fedex.com');    
        
        
    
        
        // Send the request, and return a response
        HttpResponse res = h.send(req);
       
        String xml = res.getBody();
       
          result = xml;
    
           
        //XmlStreamReader r = new XmlStreamReader(xml);
        //result = xml; //r.nextTag();
       
        //result = res.getStatus();
   //XmlStreamReader xsr = new XmlStreamReader(res);
   //xsr.setCoalescing(true);
     //xsr.nextTag();
     //result = xsr;
   
 
       
       
    
    
   }

   
   
   
}