Delphi-授权TIdHttp对HTTP代理进行故障转移

Question

I'm using Delphi XE 6 and TIdHttp component(Indy 10.6.0.5122) and trying to consume a SOAP service - http://www.webservicex.net/globalweather.asmx over a http proxy (CCProxy - http://www.youngzsoft.net/ccproxy/ ). 我正在使用Delphi XE 6和TIdHttp组件（Indy 10.6.0.5122），并尝试通过HTTP代理（CCProxy- http：// www。）使用SOAP服务-http: //www.webservicex.net/globalweather.asmx 。 youngzsoft.net/ccproxy/ ）。 The issue is that at the first attempt to connect to the webservice I receive an "Unauthorized" respone: 问题是，在第一次尝试连接到Web服务时，我收到了“未经授权”的响应：

<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><h1>Unauthorized ...</h1>
<h2>IP Address: xxx.xxx.xxx.:61295<br>
MAC Address: <br>
Server Time: 2014-11-18 14:19:00<br>
Auth Result: </h2></body></html>

I've linked an IdSSLIOHandlerSocketOpenSSL and IdLogDebug1 components to IdHttp in order to debug the issue. 我已将IdSSLIOHandlerSocketOpenSSL和IdLogDebug1组件链接到IdHttp以便调试问题。

Logs of the operations performed 所执行操作的日志

***********************IdSSLIOHandlerSocketOpenSSL1Status 
Connecting to xxx.xxx.xxx.xxx.

***********************IdLogDebug1Send 
POST http://www.webservicex.net/globalweather.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
Content-Length: 388
SOAPAction: http://www.webserviceX.NET/GetCitiesByCountry
Host: www.webservicex.net
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: identity
User-Agent: Mozilla/3.0 (compatible; Indy Library)



***********************IdLogDebug1Send 
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetCitiesByCountry xmlns="http://www.webserviceX.NET">
      <CountryName>Romania</CountryName>
    </GetCitiesByCountry>
  </soap:Body>
</soap:Envelope>

***********************IdLogDebug1Receive 
HTTP/1.0 407 Unauthorized
Server: Proxy
Proxy-Authenticate: Basic realm="CCProxy Authorization"
Cache-control: no-cache

<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><h1>Unauthorized ...</h1>
<h2>IP Address: xxx.xxx.xxx.xxx:61295<br>
MAC Address: <br>
Server Time: 2014-11-18 14:19:00<br>
Auth Result: </h2></body></html>

***********************IdSSLIOHandlerSocketOpenSSL1Status 
Disconnected.

Now, what is interesting is that if I'm trying again to call the webservice everything works correctly. 现在，有趣的是，如果我再次尝试调用Web服务，则一切正常。 Log of the operations: 操作日志：

***********************IdSSLIOHandlerSocketOpenSSL1Status 
Connecting to xxx.xxx.xxx.xxx.

***********************IdLogDebug1Send 
POST http://www.webservicex.net/globalweather.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
Content-Length: 388
SOAPAction: http://www.webserviceX.NET/GetCitiesByCountry
Host: www.webservicex.net
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: identity
User-Agent: Mozilla/3.0 (compatible; Indy Library)
Proxy-Authorization: Basic YW1ibzphbWJvIQ==



***********************IdLogDebug1Send 
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetCitiesByCountry xmlns="http://www.webserviceX.NET">
      <CountryName>Romania</CountryName>
    </GetCitiesByCountry>
  </soap:Body>
</soap:Envelope>

***********************IdLogDebug1Receive 
HTTP/1.1 200 OK
Cache-Control: private, max-age=0
Content-Length: 2456


***********************IdLogDebug1Receive 
Content-Type: text/xml; charset=utf-8
Server: Microsoft-IIS/7.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Tue, 18 Nov 2014 12:26:21 GMT

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><GetCitiesByCountryResponse xmlns="http://www.webserviceX.NET"><GetCitiesByCountryResult>&lt;NewDataSet&gt;
  &lt;Table&gt;
    &lt;Country&gt;Romania&lt;/Country&gt;
    &lt;City&gt;Arad&lt;/City&gt;
  &lt;/Table&gt;
  &lt;Table&gt;
    &lt;Country&gt;Romania&lt;/Country&gt;
    &lt;City&gt;Bacau&lt;/City&gt;
  &lt;/Table&gt;
  ......

And the response it's correct. 答案是正确的。

Code of the application 申请代码

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, IdBaseComponent,
  IdComponent, IdTCPConnection, IdTCPClient, IdHTTP, Soap.SOAPHTTPTrans,
  IdAuthentication, IdHeaderList, IdIntercept, IdLogBase, IdLogDebug,
  IdIOHandler, IdIOHandlerSocket, IdIOHandlerStack, IdSSL, IdSSLOpenSSL
  ,IdGlobal;

type
  TForm1 = class(TForm)
    IdHTTP1: TIdHTTP;
    Button1: TButton;
    HTTPReqResp1: THTTPReqResp;
    Memo1: TMemo;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    IdSSLIOHandlerSocketOpenSSL1: TIdSSLIOHandlerSocketOpenSSL;
    IdLogDebug1: TIdLogDebug;
    Memo2: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure IdHTTP1ProxyAuthorization(Sender: TObject;
      Authentication: TIdAuthentication; var Handled: Boolean);
    procedure IdSSLIOHandlerSocketOpenSSL1StatusInfo(const AMsg: string);
    procedure IdSSLIOHandlerSocketOpenSSL1Status(ASender: TObject;
      const AStatus: TIdStatus; const AStatusText: string);
    procedure IdLogDebug1Receive(ASender: TIdConnectionIntercept;
      var ABuffer: TIdBytes);
    procedure IdLogDebug1Send(ASender: TIdConnectionIntercept;
      var ABuffer: TIdBytes);
    procedure IdHTTP1Authorization(Sender: TObject;
      Authentication: TIdAuthentication; var Handled: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  postData: TMemoryStream;
begin
  postData := TMemoryStream.Create;
  try
    Memo1.Lines.Clear;
    postData.LoadFromFile('..\..\soap1.1.txt');
    IdHTTP1.Request.ContentType := 'text/xml';
    IdHTTP1.Request.Charset := 'utf-8';
    IdHTTP1.Request.CustomHeaders.Values['SOAPAction'] := 'http://www.webserviceX.NET/GetCitiesByCountry';
    IdHTTP1.ProtocolVersion := pv1_1;
    IdHTTP1.HTTPOptions := IdHTTP1.HTTPOptions + [hoKeepOrigProtocol];
    Memo1.Lines.Text := IdHTTP1.Post('http://www.webservicex.net/globalweather.asmx', postData);
  finally
    postData.Free;
  end;
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
 with IdHTTP1.ProxyParams do
  begin
    ProxyServer := 'xxx.xxx.xxx.xxx';
    ProxyPort := 808;
    ProxyUsername := 'User-001';
    ProxyPassword := 'User-001!';
  end;

end;

procedure TForm1.IdHTTP1Authorization(Sender: TObject;
  Authentication: TIdAuthentication; var Handled: Boolean);
begin
//
  Authentication.Username := 'User-001';
  Authentication.Password := 'User-001!';
end;

procedure TForm1.IdHTTP1ProxyAuthorization(Sender: TObject;
  Authentication: TIdAuthentication; var Handled: Boolean);
begin
//
// Authentication.Username := 'User-001';
// Authentication.Password := 'User-001!';
// Handled := true;
end;

procedure TForm1.IdLogDebug1Receive(ASender: TIdConnectionIntercept;
  var ABuffer: TIdBytes);
begin
 Memo2.Lines.Add(#13#10+'***********************IdLogDebug1Receive '+#13#10+BytesToString(ABuffer))
end;

procedure TForm1.IdLogDebug1Send(ASender: TIdConnectionIntercept;
  var ABuffer: TIdBytes);
begin
 Memo2.Lines.Add(#13#10+'***********************IdLogDebug1Send '+#13#10+BytesToString(ABuffer))
end;

procedure TForm1.IdSSLIOHandlerSocketOpenSSL1Status(ASender: TObject;
  const AStatus: TIdStatus; const AStatusText: string);
begin
Memo2.Lines.Add(#13#10+'***********************IdSSLIOHandlerSocketOpenSSL1Status '+#13#10+AStatusText)
end;

procedure TForm1.IdSSLIOHandlerSocketOpenSSL1StatusInfo(const AMsg: string);
begin
Memo2.Lines.Add(#13#10+'***********************IdSSLIOHandlerSocketOpenSSL1StatusInfo '+#13#10+AMsg)
end;

end.

How should I make the authentication in order to work from the first attempt? 从第一次尝试开始，如何进行身份验证？

PS : I've already read this question - Authorization failure TIdHTTP over HTTPS . PS：我已经读过这个问题- 授权失败TIdHTTP over HTTPS 。

ANSWER : based on the indications of Remy Lebeau problem was solved by setting up the 解答：根据Remy Lebeau的指示，通过设置

OnProxySelectAuthorization OnProxySelectAuthorization

event and add the hoInProcessAuth to the 事件，并将hoInProcessAuth添加到

IdHTTP1.HTTPOptions IdHTTP1.HTTPOptions

Answer 1

Make sure you have added the IdAuthentication unit to your uses clause so TIdHTTP can process Proxy-Authorization headers in a 407 reply, and also make sure you have a TIdHTTP.OnProxyAuthorization event handler assigned (even if it just returns Handled:=True ) otherwise TIdHTTP will not attempt proxy authorization while processing a 407 reply, even though you have provided a username/password in the TIdHTTP.ProxyParams property. 请确保您已添加的IdAuthentication单元到您的uses子句，以便TIdHTTP可以处理Proxy-Authorization在407回复头，并且确保你有一个TIdHTTP.OnProxyAuthorization分配（哪怕它只是返回的事件处理程序Handled:=True ，否则） TIdHTTP不会尝试代理授权，同时处理407回复，即使你已经在提供的用户名/密码TIdHTTP.ProxyParams财产。

What is most likely happening is that the TIdHTTP.ProxyParams.Authentication property is initially nil during the first request, and gets filled in with a TIdBasicAuthentication object while processing the 407 reply, but a missing OnProxyAuthorization event handler causes TIdHTTP to skip authorization, and then the TIdHTTP.ProxyParams.Authentication property is not nil anymore when the second request is made, so it attempts authorization at that time. 最有可能发生的情况是， TIdHTTP.ProxyParams.Authentication属性最初在第一个请求期间为nil，并且在处理407答复时被TIdBasicAuthentication对象填充，但是缺少的OnProxyAuthorization事件处理程序导致TIdHTTP跳过授权，然后当发出第二个请求时， TIdHTTP.ProxyParams.Authentication属性不再为nil，因此它会在那时尝试授权。

Skipping proxy authorization if the TIdHTTP.OnProxyAuthorization event is not assigned appears to be a bug, IMHO. 如果未分配TIdHTTP.OnProxyAuthorization事件，则跳过代理授权似乎是一个错误，恕我直言。 By comparison, the TIdHTTP.OnAuthorization event can be unassigned as long as a non-empty value is assigned to the TIdHTTP.Request.Password property. 相比之下，只要将非空值分配给TIdHTTP.Request.Password属性，就可以取消分配TIdHTTP.OnAuthorization事件。 I have now updated TIdHTTP with similar logic for the OnProxyAuthorization event regarding the TIdHTTP.ProxyParams.Password property. 现在我已经更新TIdHTTP用的类似的逻辑OnProxyAuthorization关于该事件TIdHTTP.ProxyParams.Password财产。

So, either update to the latest SVN snapshot, or just assign a TIdHTTP.OnProxyAuthorization event handler, then you should be OK: 因此，要么更新到最新的SVN快照，要么只是分配一个TIdHTTP.OnProxyAuthorization事件处理程序，那么您应该可以：

procedure TForm1.IdHTTP1ProxyAuthorization(Sender: TObject; Authentication: TIdAuthentication; var Handled: Boolean);
begin
  // prompt the user for username/password (optional) and store them
  // in the Authentication.Username and Authentication.Password
  // properties, respectively. By default, they are initialized with
  // the current values of the ProxyParams.UserName and
  // ProxyParams.Password properties...
  Handled := True;
end;

Delphi-授权TIdHttp对HTTP代理进行故障转移

问题描述

1 个解决方案

解决方案1
2 已采纳 2014-11-18 16:28:17

Delphi-授权TIdHttp对HTTP代理进行故障转移

问题描述

1 个解决方案

解决方案1 2 已采纳 2014-11-18 16:28:17

解决方案1
2 已采纳 2014-11-18 16:28:17