[英]How to deal with Clouflare, I get Cloudflare instead of the actual site source when i do an Idhttp.get
我正在嘗試做一個簡單的IdHttp.get
但是我得到的響應給了我CloudFlare
的頁面,上面寫着Checking your browser before accessing...
我該如何處理呢?,我嘗試了我能想到的任何選項,甚至嘗試了Sleep(6000)
並重復IdHttp.get
,因為CloudFlare
消息說要wait for 5 second
這是我的代碼:
var
mIdHttp: TIdHttp;
URL: String;
memoryStream: TMemoryStream;
Begin
mIdHttp := TIdHttp.create(nil);
mIdHttp.AllowCookies := true;
mIdHttp.HandleRedirects := true;
mIdHttp.Request.UserAgent := 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36 OPR/44.0.2510.1457';
mIdHttp.Request.Accept := 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8';
mIdHttp.Request.AcceptEncoding := 'gzip, deflate';
mIdHttp.Request.AcceptLanguage := 'en-US,en;q=0.9';
mIdHttp.Request.Host := 'somesite.com/'';
URL := 'https://somesite.com'';
//Both ssleay32.dll and libeay32.dll are beside the application.
mIdHttp.get(URL, memoryStream);
memoryStream.saveToFile('response.txt');
End;
我解決了這個問題,首先將indy版本更新為10.6.2.0,然后按照下面的請求代碼進行操作:
function Request(Method,URL:String;RequestHeaders,SendString:String;TreadTLog:TLogger;ContentType:string='application/x-www-form-urlencoded'
;SSLVersion:TIdSSLVersion=sslvSSLv23;UserAgent:string='Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0'):string;
var
SendStream,GetSStream: TStringStream;
IdHTTP:TIdHTTP;
List:TStringList;
LHandler: TIdSSLIOHandlerSocketOpenSSL;
EvHandler:TEventHandlers;
IdConnectionIntercept:TIdConnectionIntercept;
i:Integer;
RetStr,S,KEY,VALUE:string;
begin
Result:='';
if URL='' then Exit;
IdHTTP:=TIdHTTP.Create(nil);
List := TStringList.Create;
SendStream:=TStringStream.Create('');
GetSStream:=TStringStream.Create('');
try
ExtractStrings(['&'],[],pchar(RequestHeaders),List);
SendStream.WriteString(SendString);
try
IdConnectionIntercept:= TIdConnectionIntercept.Create(nil);
IdConnectionIntercept.OnReceive := EvHandler.IdConnectionInterceptReceive;
IdConnectionIntercept.OnSend := EvHandler.IdConnectionInterceptSend;
IDHTTP.Intercept := IdConnectionIntercept;
if (pos('HTTPS',UPPERCASE(URL))>0) then
begin
LHandler := TIdSSLIOHandlerSocketOpenSSL.Create(IDHTTP);
IdHTTP.IOHandler:=LHandler;
LHandler.OnVerifyPeer:=EvHandler.LHandlerVerifyPeer;
LHandler.SSLOptions.Method := SSLVersion;
LHandler.SSLOptions.SSLVersions:=[sslvSSLv23,sslvSSLv2, sslvSSLv3, sslvTLSv1,sslvTLSv1_1,sslvTLSv1_2];
LHandler.SSLOptions.Mode := sslmUnassigned;
LHandler.SSLOptions.VerifyMode := LHandler.SSLOptions.VerifyMode + [sslvrfPeer];;
LHandler.SSLOptions.VerifyDepth := 0;
end
else IdHTTP.IOHandler:=nil;
for i:=0 to List.Count-1 do
begin
S:=Trim(List.Strings[i]);
if S<>'' then
begin
KEY:=Copy(S,1,Pos('=',S)-1);
VALUE:=Copy(S,Pos('=',S)+1,Length(S));
IdHTTP.Request.CustomHeaders.Add(KEY+':'+VALUE);
end;
end;
IdHTTP.Request.ContentType :=ContentType;
IdHTTP.Request.UserAgent:=UserAgent;
IdHTTP.HandleRedirects := True;
IdHTTP.AllowCookies := True;
IdHTTP.Request.Connection:='keep-alive';
IdHTTP.Request.BasicAuthentication := False;
IdHTTP.Request.Accept:='text/html, */*';
IdHTTP.Request.AcceptEncoding:='identity';
//IdHTTP.ReadTimeout:=MySysPM.PMA06;
//IdHTTP.ConnectTimeout:=MySysPM.PMA06;
IdHTTP.HTTPOptions:=IdHTTP.HTTPOptions+[hoKeepOrigProtocol];
IdHTTP.ProtocolVersion:=pv1_1;
IdHTTP.Request.Referer:='';
IF UpperCase(Method)='POST' then
BEGIN
IdHTTP.Post(URL,SendStream,GetSStream);
RetStr:=Utf8ToAnsi(GetSStream.DataString);
end
else if UpperCase(Method)='GET' then
begin
RetStr:=IdHTTP.Get(URL);
end
else begin
IdHTTP.Delete(URL);
end;
IdHTTP.Disconnect;
Result:=RetStr
except
on E:exception do
begin
TreadTLog.WriteLog('Request:'+e.Message,1);
end;
end;
finally
try
if Assigned(IdConnectionIntercept) then FreeAndNil(IdConnectionIntercept);
FreeAndNil(LHandler);
FreeAndNil(SendStream);
FreeAndNil(GetSStream);
FreeAndNil(List);
FreeAndNil(IdHTTP);
except
end;
end;
end;
Cloudflare實現了針對僵屍程序(DDoS攻擊等)的防護,這就是等待5秒鍾的時間。
您的應用不是執行Javascript的網絡瀏覽器,因此將其視為機器人。
Cloudflare使用Javascript發送挑戰,必須對挑戰進行計算,然后將其發送回Cloudflare,以獲取cookie,然后該cookie可用於繞過后續請求的保護。
如何使用cloudflare ddos portection從頁面獲取html?
上面的鏈接適用於C#。 您將必須使用Indy和所需的任何Javascript / Regex庫在Delphi中復制類似的解決方案。
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