在WebService中，用户身份认证信息可以在客户端通过soap头(soap header)进行传送。在WebService服务端的编写中，需要对soap头进行处理，这个处理过程就是提取Soap Header中的用户认证信息进行验证。下面就来看看在Delphi中这个身份认证是如何实现的:

   通过WSDL import引入WEBSERVICE，DELPHI会自动产生自定义的Header类，这个类继承于TSoapHeader。

ShuSoapHeader = class(TSOAPHeader)
  private
    FNMsg: WideString;
    FUserID: WideString;
    FPassWord: WideString;
  published
    property NMsg: WideString read FNMsg write FNMsg;
    property UserID: WideString read FUserID write FUserID;
    property PassWord: WideString read FPassWord write FPassWord;
  end;

同时自动产生引用接口：

  InvRegistry.RegisterInterface(TypeInfo(SLoginServicesSoap), 'http://passport.shu.edu.cn/', 'utf-8');
  InvRegistry.RegisterDefaultSOAPAction(TypeInfo(SLoginServicesSoap), 'http://passport.shu.edu.cn/%operationName%');
  InvRegistry.RegisterHeaderClass(TypeInfo(SLoginServicesSoap), ShuSoapHeader, 'ShuSoapHeader', '');
  RemClassRegistry.RegisterXSClass(ShuSoapHeader, 'http://passport.shu.edu.cn/', 'ShuSoapHeader');
  RemClassRegistry.RegisterXSInfo(TypeInfo(ArrayOfString), 'http://passport.shu.edu.cn/', 'ArrayOfString');

客户端使用：

var
  i:integer;
  aIntf: SLoginServicesSoap;
  soaphead : ShuSoapHeader;
  Headers: ISOAPHeaders;
begin
    aIntf := sLogin as SLoginServicesSoap;//THTTPRIO控件
    soaphead:=  ShuSoapHeader.Create;
    soaphead.UserID :='';
    soaphead.PassWord := '';
    try
      Headers := (aIntf  as  ISOAPHeaders);
      Headers.Send(soaphead);  //发送Soap Header
      i:= aIntf.ValidByEd(Trim(Edit_name.Text),Trim(Edit_pass.Text));
    finally
      aIntf := nil;
      soaphead.Free;
    end;