PHP SoapClient：动作不匹配

这是我的代码：

$this->_client = new SoapClient(SOAP_TAGGING_URL,array(
    'trace' => 1,'soap_version' => SOAP_1_2,'cache_wsdl' => WSDL_CACHE_NONE,'exceptions' => true,'uri' => SOAP_URI,)); 
try { 
    $actionHdr = array(); 
    $actionHdr[] = new SoapHeader(SOAP_TAGGING_URL,'Action','GetMessagesByTagsByGroup'); 
    $this->_client->__setSoapHeaders($actionHdr);
    $info = $this->_client->GetMessagesByTagsByGroup( 
        new SoapParam($this->params['mPID'],'ParentMessageID'),new SoapParam($gid,'GroupId'),new SoapParam(REQUEST_TOKEN,'RequestToken'),new SoapParam(ACCESS_TOKEN,'AccessToken'),new SoapParam(ACCESS_TOKEN_SECRET,'AccessTokenSecret') 
    );  
} catch (SoapFault $fault) { 
    print("n<br/>SOAP server returned the following ERROR: ".$fault->faultcode."-".$fault->faultstring); 
}

echo "n<br/>SOAP request: ". htmlentities($this->_client->__getLastRequest());
echo "n<br/>SOAP response: ". htmlentities($this->_client->__getLastResponse());

这是我得到的响应(格式化添加)：

SOAP server returned the following ERROR: s:Sender-The SOAP action specified on the message,'',does not match the HTTP SOAP Action,'http://tempuri.org/ITagging/GetMessagesByTagsByGroup'. 
SOAP request: 
<?xml version="1.0" encoding="UTF-8"?> 
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:ns1="http://tempuri.org/" xmlns:ns2="https://mywebserver.com/myWSDL.svc/ws?wsdl">
    <env:Header>
        <ns2:Action>GetMessagesByTagsByGroup</ns2:Action>
    </env:Header>
    <env:Body>
        <ns1:GetMessagesByTagsByGroup/>
            <GroupId>2178</GroupId>
            <RequestToken>odwedwo09i0jACqbbjsw6KnlCA=</RequestToken>        
            <AccessToken>OlVbHurPJrNrEFR54Y0hV9kI/TZs=</AccessToken>
            <AccessTokenSecret>js1kerfe453FLuaXpL 892DY o=</AccessTokenSecret>
    </env:Body>
</env:Envelope> 
SOAP response: 
<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://www.w3.org/2005/08/addressing">
<s:Header>
    <a:Action s:mustUnderstand="1">http://www.w3.org/2005/08/addressing/fault</a:Action>    
</s:Header>
    <s:Body>
        <s:Fault>
            <s:Code>
                <s:Value>s:Sender</s:Value>
                <s:Subcode>
                    <s:Value>a:ActionMismatch</s:Value>
                </s:Subcode>
            </s:Code>
            <s:Reason>
                <s:Text xml:lang="en-US">The SOAP action specified on the message,'http://tempuri.org/ITagging/GetMessagesByTagsByGroup'. </s:Text>
            </s:Reason>
            <s:Detail>
                <a:ProblemHeaderQName>a:Action</a:ProblemHeaderQName>
            </s:Detail>
        </s:Fault>
    </s:Body>
</s:Envelope>

我以为我在标题中添加了’Action’参数,但显然不是放置它的地方.或者我做错了什么？

不幸的是我无法尝试NuSoap,因为我无法控制服务器.

谢谢,

克