signature_invalid while getting access token

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Do svn checkout
2. Download Zend framework and put it in subfolder
3. Fill configuration variables with relevant consumer data

What is the expected output? What do you see instead?

Fatal error:  Uncaught exception 'Zend_Gdata_App_HttpException' with message 
'Expected response code 200, got 401[..]' in 
/home/www/[...]/htdocs/gdata.svn/hybrid/Zend/Gdata/App.php:711

And if I trace it, then it happens because of empty access key. At index.php 
line 104
  $access_token = getAccessToken($request_token);

And if I trace that, then printing $responce gives
signature_invalid

Original issue reported on code.google.com by [email protected] on 21 Dec 2010 at 2:56