Location remove

My previous pull request added `CURLOPT_FOLLOWLOCATION` since, curl is now instructed to follow the `Location` header before the proxy handles the response, the proxy should no longer need to handle the `Location` header.

This pull request handles removes this, and hence removes the need to pass `$url` as the first argument, since this handling was the only place it was used.

This is an api change, so I also included changes to the examples to reflect it.