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function GetUrlContent(const Url: string): string;
var
  NetHandle: HINTERNET;
  UrlHandle: HINTERNET;
  Buffer: array[0..1024] of Char;
  BytesRead: dWord;
begin
  Result := '';
  NetHandle := InternetOpen('Delphi 5.x', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);

  if Assigned(NetHandle) then
  begin
    UrlHandle := InternetOpenUrl(NetHandle, PChar(Url), nil, 0, INTERNET_FLAG_RELOAD, 0);

    if Assigned(UrlHandle) then
      { UrlHandle valid? Proceed with download }
    begin
      FillChar(Buffer, SizeOf(Buffer), 0);
      repeat
        Result := Result + Buffer;
        FillChar(Buffer, SizeOf(Buffer), 0);
        InternetReadFile(UrlHandle, @Buffer, SizeOf(Buffer), BytesRead);
      until BytesRead = 0;
      InternetCloseHandle(UrlHandle);
    end
    else
      { UrlHandle is not valid. Raise an exception. }
      raise Exception.CreateFmt('Cannot open URL %s', [Url]);

    InternetCloseHandle(NetHandle);
  end
  else
    { NetHandle is not valid. Raise an exception }
    raise Exception.Create('Unable to initialize Wininet');
end;					

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Procedure GetHttpContent;
var 
  URL: String;
  memo: TMemo;
  TestWString:WideString;
  TestString:String;

begin
   URL:='http:http://webservices.amazon.de/onca/xml?AWSAccessKeyId=[entfernt]&IdType=EAN&ItemId=9783785537541&Operation=ItemLookup&ResponseGroup=Medium%2COfferFull&SearchIndex=All&Service=AWSECommerceService&Timestamp=2010-10-22T11%3A30%3A06Z&Version=2009-01-06&Signature=U2JSWkT30S/Mq4VUCXlrDBwjDckjJ5DVytgBdaH2obo%3D';
   memo.Add(GetUrlContent(URL));
   TestWString:=GetUrlContent(URL);
   TestString:=GetUrlContent(URL);
end;					

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<?xml version="1.0" ?>
<ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2009-01-06">
<OperationRequest>
<HTTPHeaders>
<Header Name="UserAgent" Value="Mozilla/4.0 (compatible; ICS)">
</Header>
</HTTPHeaders>
<RequestId>eb82c871-b7d9-400c-ac8f-6e8d39b437ed</RequestId>
<Arguments>
<Argument Name="Operation" Value="ItemLookup">
</Argument>
<Argument Name="Service" Value="AWSECommerceService">
</Argument>
...					

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