I try to make an API Request to the Github API just for testing. I installed the latest Guzzle Version ( \"guzzle/guzzle\": \"^3.9\" ) on my Laravel 5.1 APP.
In my routes
Actually a variable interpolation is not possible within single quotes. This means that you currently are calling users/$username and the $username variable gets not replaced with its value.
In order to get it, you should use it in one of the following ways:
$response = $client->get("users/$username")->send();
$response = $client->get('users/' . $username)->send();
I personally prefer the second one as it is assumed to be faster.