public function check($owner, $repo, $assignee)
	{
		// Build the request path.
		$path = '/repos/' . $owner . '/' . $repo . '/assignees/' . $assignee;

		try
		{
			$response = $this->client->get($this->fetchUrl($path));

			if ($response->code == 204)
			{
				return true;
			}

			throw new UnexpectedResponseException($response, 'Invalid response: ' . $response->code);
		}
		catch (\DomainException $e)
		{
			if (isset($response->code) && $response->code == 404)
			{
				return false;
			}

			throw $e;
		}
	}