Error requesting error while sending PHP SOAP request, but requesting it correctly

Question

I was tired of this problem for a long time and could not find a solution after many hours of searching.

I am using Fedex web service which returns delivery speed. Next is my php code

try { 

    $client = new SoapClient($path_to_wsdl, array(
                     'uri' => 'http://fedex.com/ws/rate/v14',
                     'location' => 'https://ws.fedex.com:443/web-services/rate',
                     'soap_version' => 'SOAP_1_1',
                     'login' => 'myusername',       //I don't know whether this is needed but but it is an internal company site 
                     'password' => 'password',      //so I log in with this username and pw to see it
                     'proxy_host' => 'proxy-host-name',
                     'proxy_port' => 443,
                     'proxy_login'    => '',
                     'proxy_password' => '',
                     'trace' => 1,
                     'exceptions' => 1));

    $data = array(
        'Action' => "http://fedex.com/ws/rate/v14/getRates"
    );
    $header = new SoapHeader('http://fedex.com/ws/rate/v14', 'FedexHeader', $data, false);
    $client->__setSoapHeaders($header);

    if(setEndpoint('changeEndpoint')){
        $newLocation = $client->__setLocation(setEndpoint('endpoint'));
    }
    $response = $client -> getRates($request);
} catch (SoapFault $exception) {
    echo '<h2>exception</h2>';
    print_r($exception); 
    echo '<br/><h2>exception trace</h2>';
    var_dump($exception->getTraceAsString());

    echo '<br/>Request headers : <br/><xmp>', 
        $client->__getLastRequestHeaders(), 
        '</xmp><br/>';
    echo 'Request : <br/><xmp>', 
        $client->__getLastRequest(), 
        '</xmp><br/>';
    echo 'Response headers: <br/><xmp>', 
        $client->__getLastResponseHeaders(), 
        '</xmp><br/>';
    echo 'Response : <br/><xmp>', 
        $client->__getLastResponse(), 
        '</xmp><br/>';               
        printFault($exception, $client);        
}

This is an example of Fedex code - the only parts I changed are the path to the wsdl file, adding more debugging information, and installing SoapHeader.

The following is the request header:

POST /web-services/rate HTTP/1.1 Host: ws.fedex.com 
Connection: Keep-Alive User-Agent: PHP-SOAP/5.3.27 
Content-Type: text/xml; charset=utf-8 
SOAPAction: "http://fedex.com/ws/rate/v14/getRates" 
Content-Length: 2974

and response header:

HTTP/1.1 400 Bad Request 
Date: Mon, 17 Feb 2014 16:25:56 
GMT Server: Apache/2.2 
Content-Length: 226 
Connection: close 
Content-Type: text/html; charset=iso-8859-1

Here is the part of the SOAP request itself that is generated:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://fedex.com/ws/rate/v14" xmlns:ns2="http://www.w3.org/2005/08/addressing">
    <SOAP-ENV:Header>
      <ns2:Action>http://fedex.com/ws/rate/v14/getRates</ns2:Action>
    </SOAP-ENV:Header>

    <SOAP-ENV:Body>
      <ns1:RateRequest>
         <ns1:WebAuthenticationDetail>
            <ns1:UserCredential>
               //user credentials
            </ns1:UserCredential>
         </ns1:WebAuthenticationDetail>
         <ns1:ClientDetail>
           //client details
         </ns1:ClientDetail>
         <ns1:RequestedShipment>
            //shipping details ..
         </ns1:RequestedShipment>
      </ns1:RateRequest>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

The thing is, when I insert this request into the SOAP interface, it returns the correct answer. Also, the Fedex support team has confirmed that it is true.

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SoapHeader , , , . , soapAction Action, wsdl soapAction? wsdl:

<operation name="getRates">
  <s1:operation soapAction="http://fedex.com/ws/rate/v14/getRates" style="document"/>
</operation>

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