Flex sending corrupt SOAP request

Question

I've created a PHP5 SOAP webservice and am trying to call a
method from flex. I get a fault from the Flex app that says
faultString="HTTP request error"
faultCode="Server.Error.Request"
The SOAP request received by the server is as follows (which
I think explains why the server responded with an error):
<SOAP-ENV:Envelope xmlns:SOAP-ENV="
http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="
http://www.w3.org/2001/XMLSchema"
xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance">
<SOAP-ENV:Body/>
</SOAP-ENV:Envelope>
It is missing all the body parameters. What could cause an
empty request like this?
The relevant AS:
public var _webServiceLoaded:Boolean = false; // flag noting
when wsdl has been loaded
public var _myService:WebService = new WebService();
public function initWS():void {
_myService.wsdl = "
http://foreignserver.com/seminar_service.wsdl";
_myService.loadWSDL();
_myService.echoArgs.addEventListener("result",
echoResultHandler);
_myService.addEventListener("fault", faultHandler);
_myService.addEventListener('load',WSLoad);
public function send_attendee_email():void {
_myService.echoo("qwerty"); // should just return the same
string we send; echoo spelled with extra o
And my wsdl:
<?xml version="1.0"?>
<definitions
xmlns="
http://schemas.xmlsoap.org/wsdl/"
xmlns:xsd="
http://www.w3.org/2001/XMLSchema"
xmlns:tns="
http://foreignserver.com/seminar_service.php"
xmlns:soap="
http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:wsdl="
http://schemas.xmlsoap.org/wsdl/"
xmlns:soapenc="
http://schemas.xmlsoap.org/soap/encoding/"
targetNamespace="
http://foreignserver.com/seminar_service.php">
<message name="echooInput">
<part name="echo" type="xsd:string"/>
</message>
<message name="send_attendee_emailInput">
<part name="sem_date" type="xsd:string"/>
<part name="sem_first" type="xsd:string"/>
<part name="sem_last" type="xsd:string"/>
<part name="sem_title" type="xsd:string"/>
<part name="sem_company" type="xsd:string"/>
<part name="sem_phone" type="xsd:string"/>
<part name="sem_email" type="xsd:string"/>
<part name="pdf_filename" type="xsd:string"/>
</message>
<message name="echooOutput">
<part name="return" type="xsd:string"/>
</message>
<message name="send_attendee_emailOutput">
<part name="return" type="xsd:string"/>
</message>
<portType name="seminarPortType">
<operation name="echoo">
<input message="tns:echooInput"/>
<output message="tns:echooOutput"/>
</operation>
<operation name="send_attendee_email">
<input message="tns:send_attendee_emailInput"/>
<output message="tns:send_attendee_emailOutput"/>
</operation>
</portType>
<binding name="seminarBinding"
type="tns:seminarPortType">
<soap:binding xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
style="rpc" transport="
http://schemas.xmlsoap.org/soap/http"/>
<operation xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/"
name="echoo">
<input xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/">
<soap:body xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
use="encoded" encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"/>
</input>
<output xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/">
<soap:body xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
use="encoded" encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"/>
</output>
</operation>
<operation xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/"
name="send_attendee_email">
<input xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/">
<soap:body xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
use="encoded" encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"/>
</input>
<output xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/">
<soap:body xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
use="encoded" encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/"/>
</output>
</operation>
</binding>
<service name="seminarService">
<port xmlns:default="
http://schemas.xmlsoap.org/wsdl/soap/"
name="seminarPort" binding="tns:seminarBinding">
<soap:address xmlns="
http://schemas.xmlsoap.org/wsdl/soap/"
location="
http://foreignserver.com/seminar_service.php"/>
</port>
</service>
</definitions>

Answer 1

This behavior (empty SOAP request sent to server) stemmed
somehow from my wsdl file. I'm uncertain what the specific problem
was, but when I rebuilt the wsdl from scratch using a different
model, the SOAP request from Flex was properly formed.