[SOAP] soapcall.invoke() runs up to 20 seconds before sending request to server

hallo list,

hope this is the right place to post this SOAP-related question. so, i 
have build up a remote script with an soap-client which request to an 
soap-server based on php. this is my code to use the soap-web-service on 
my intranet-server:


        var method = "test";
        var service = "uri:xfibel";
        var mySOAPcall = new SOAPCall();
        mySOAPcall.transportURI = 
"http://intranet/intranet-dev/unstable/bundle/xfibel/api/xfibel-handler.php";;

        var myParams = new Array();
        myParams[0] = new SOAPParameter("Hello World!", "value");

        mySOAPcall.encode(0, method, service, 0, null, myParams.length, 
myParams);

        var myAnswer = mySOAPcall.invoke();

        if (myAnswer.fault) {
            alert(myAnswer.fault.faultString);
            return false;
        } else {
            var num = new Object();
            var params = myAnswer.getParameters(false, num);
            return params[0].value;
        }

here is my php-code:

<?php
# php5.0.0
# using php-soap-extension

function test($value) {
  return $value;
}

$server = new SoapServer(null, array('uri' => "xfibel"));
$server->addFunction("test");
$server->handle();

?>


so, the problem is that the script runs till the invoke() method, than 
seems to hang or executing something(maybe some xml serializing?), that 
needs up to 20 seconds and then receive the message from the server and 
returns it without(!) any error. the result is as expected!

i checked out if the server was running in the right manner, i request 
the php service with an other client(php-script) and get the response 
immediatly and without error. i also logged the execution-time of the 
server process for both, the php-client and the mozilla/firefox-client. 
no difference found. however, the problem seems to be on the 
mozilla/firefox-client side.

unfortunately my knowledge about the soap and http internernals are 
minimal. my guess is, that in the http connection area something goes 
wrong or in other words: pretty slow. is there a way(class) to monitor 
the http request which are send by the soap component(invoke or 
asyncinvoke)? by the way, asyncinvoke() runs also slow.

is anyone out there which runs under the same problem and get out of the 
blog?

many thanks for any notes and suggestionens!

regards, markus siebeneicher