Synapse and string problems with HTTPSend in Delphi 2010

I have been trying to get to the bottom of this problem off and on for the past 2 days and I'm really stuck. Hopefully some smart folks can help me out.

The issue is that I have a function that I call in a thread that downloads a file (using Synapse libraries) from a website that is passed to it. However, I've found that every once in a while there are sites where it will not pull down a file, but wget or Firefox/IE will download it without issue.

Digging into it, I've found some curious things. Here is the relevant code:

uses
//[..]
  HTTPSend,
  blcksock;

//[..]

type
  TMyThread = class(TThread)
  protected
    procedure Execute; override;
  private
    { Private declarations }
    fTheUrl: string;
    procedure GetFile(const TheUrl: string);
  public
    property thrd_TheUrl: string read fTheUrl write fTheUrl;
  end;

implementation

[..]

procedure TMyThread.GetFile(const TheUrl: string);
var
  HTTP: THTTPSend;
  success: boolean;
  sLocalUrl: string;
  IsSame : boolean;
begin

  HTTP := THTTPSend.Create;
  try
    HTTP.UserAgent :=
      'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727)';
    HTTP.ProxyHost := 'MYPROXY.COM';
    HTTP.ProxyPort := '80';

    sLocalUrl :=
      'http://web.archive.org/web/20071212205017/energizer.com/usbcharger/download/UsbCharger_setup_V1_1_1.exe';


   IsSame :=  SameText(sLocalUrl, sTheUrl); //this equals True when I debug

   ///
   ///
   /// THIS IS WHERE THE ISSUE BEGINS
   ///  I will comment out 1 of the following when debugging
   ///
    HTTP.HTTPMethod('GET', sLocalUrl); // ----this works and WILL download the file
    HTTP.HTTPMethod('GET', sTheUrl);  // --- this always fails, and HTTP.ResultString contains "Not Found"

    success := SysUtils.UpperCase(HTTP.ResultString) = 'OK';


    if HTTP.ResultCode > 0 then
      success := True; //this is here just to keep the value around while debugging
  finally
    HTTP.Free;
  end;
end;

procedure TMyThread.Execute
begin
   //fTheURL contains this value:  http://web.archive.org/web/20071212205017/energizer.com/usbcharger/download/UsbCharger_setup_V1_1_1.exe

   GetFile(fTheUrl);
end;

The problem is that when I assign a local variable to the function and give it the URL directly, everything works. However, when passing the variable into the function, it fails. Anyone have any ideas?

    HTTP.HTTPMethod('GET', sLocalUrl); // ----this works and WILL download the file
    HTTP.HTTPMethod('GET', sTheUrl);  // --- this always fails, and HTTP.ResultString contains "Not Found"

I'm using the latest version of Synapse from their SVN repository (version from 2 days ago).

NOTE: The file I am attempting to download is known to have a virus, the program I am writing is meant to download malicious files for analysis. So, don't execute the file once you download it.

However, I'm using this URL b/c this is the one I can reproduce the issue with.

Well, I'm almost embarrassed to report it, but I owe it to those that took the time to respond.

The issue had nothing to do with Synapse, or TThread, but instead had everything to do with the fact that the URL is case-sensitive!

In my full application, I had a helper function that lowercased the URL (for some reason). I removed that and everything started working again...