IdHTTP basic authentication access violation

Question

I'm trying to do a HTTP Authentication with Indy HTTP class. But for some unknown reason I'm getting an Access Violation error in this line: IdHTTP1.Request.Authentication.Username := Username;

The code stretch is:

  IdHTTP1:= TIdHttp.Create(Application);
  IdHTTP1.ConnectTimeout:= 10000;
  IdHTTP1.Request.Clear;
  IdHTTP1.Request.BasicAuthentication:= true;
  IdHTTP1.Request.Authentication.Username := Username;
  IdHTTP1.Request.Authentication.Password := Password;
      try
        IdHTTP1.Get(PbxURL);
        HttpCode := IdHTTP1.ResponseCode;
      except
        on E: EIdHTTPProtocolException do
          HttpCode := IdHTTP1.ResponseCode;

I'm using Delphi 2010, and already tried to do something like: IdHTTP1.Request.Authentication.Username := 'admin'; but didn't solved the problem...

When you say "access violation" or "error" or "exception", you need to tell us what the error or AV or exception is (the exact error message, including any memory addresses or error codes). We can't see your screen from where we are, so if you don't tell us, we don't know. (Based on the limited info you've provided, you're getting an error trying to write to 00000000, which means there's no object instance created for IdHTTP1.Request.Authentication.) — Ken White
Okay, first thing is: when i'm running the .exe outside the compiler/debugger, it don't shows me any error, just don't work... but when i'm debugging, I get this error: Project Project1.exe raised exception class EAccessViolation with message 'Access violation at address 0051AC50 in module 'Project1.exe'. Read of address 00000000'. — HwTrap
Just as I said; there's no Request.Authentication object instance created. See my answer. — Ken White

Ken White Ken White · Accepted Answer · 2012-09-15T20:56:22

From a quick check, it appears that there is no IdHTTP.Request.Authentication needed (and therefore none is created) when the Request.BasicAuthentication is true. You should be using Request.UserName and Request.Password instead.

IdHTTP1:= TIdHttp.Create(Application);
IdHTTP1.ConnectTimeout:= 10000;
IdHTTP1.Request.Clear;
IdHTTP1.Request.BasicAuthentication:= true;
IdHTTP1.Request.UserName := UserName;
IdHTTP1.Request.Password := Password;

IdHTTP basic authentication access violation

2 Answers