delphi - 如何清除 Indy TIdHTTP BasicAuthentication 凭据？

Question

我使用 Indy TIdHTTP 通过 BasicAuthentication 进行获取请求。

代码工作正常，但如果用户使用正确的登录密码重新输入凭据并再次发送请求，TIdHTTP 在第一个 401 之后不会清除 BasicAuthentication 凭据。用户必须登录两次才能授权。

用户操作顺序:

Step 1. User type wrong login-password: ResponseCode = 401

Step 2. User type right login-password: ResponseCode = 401

Step 3. User type right login-password: ResponseCode = 200

我认为第 2 步的结果是一个错误。我该怎么办？

简单代码:

var
IdHTTP1: TIdHTTP;

fLogin : string;
fPassword : string;

/// ...

if ( fLogin <> '' ) and ( fPassword <> '' )
  then
    begin
    if ( IdHTTP1.Request.Username <> fLogin )
        or
       ( IdHTTP1.Request.Password <> fPassword )
      then
        begin  
          IdHTTP1.Request.BasicAuthentication := True;
          IdHTTP1.Request.Username := fLogin;
          IdHTTP1.Request.Password := fPassword;
        end;

      s := IdHTTP1.Get( 'some_url' );          
      response_code := Idhttp1.response.ResponseCode;

      case response_code of
        200:
          begin
               // parse request data
          end;
        401 : Result := nc_res_Auth_Fail;
        else Result := nc_res_Fail;
       end;
end;

Answer 1

您应该在更改之前清除您的身份验证

  if Assigned(IdHTTP1.Request.Authentication) then
    begin
      IdHTTP1.Request.Authentication.Free;
      IdHTTP1.Request.Authentication:=nil;
    end;

或者你可以这样改变它

  if Assigned(IdHTTP1.Request.Authentication) then
    begin
      IdHTTP1.Request.Authentication.Username:=...;
      IdHTTP1.Request.Authentication.Password:=...;
    end else
    begin
      IdHTTP1.Request.BasicAuthentication:=True;
      IdHTTP1.Request.Username:=...;
      IdHTTP1.Request.Password:=...;
    end;