I was recently trying to make some API requests from within WordPress using `wp_remote_get()`, but the site I was asking for data from was rejecting requests from the default WordPress User Agent. I tried to set the user agent to something different, but it still wasn’t working:

$response = wp_remote_get($url, array(
  'timeout' => 20,
  'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0'
));

Thankfully, Otto spotted my problem. The `user-agent` key needs to be lowercase so that it is picked up properly by the WordPress core code. This works:

$response = wp_remote_get($url, array(
  'timeout' => 20,
  'user-agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:20.0) Gecko/20100101 Firefox/20.0'
));

And there you have it. It’s always nice to have an extra set of eyes on some code.