getRequestId() method is not able to capture header (issue #123) II

[buzz8year]

public function getRequestId() { if (isset($this->headers['Request-Id'])) { return $this->headers['Request-Id'][0]; } return null; } 

• given method is not able to capture header by key 'Request-Id' (reproduction is questionable)
• yet, using lowercased analogue 'request-id' returns expected...
• option:

public function getRequestId() { if (isset($this->headers['Request-Id'])) { return $this->headers['Request-Id'][0]; } else { if (isset($this->headers[strtolower('Request-Id')])) { return $this->headers[strtolower('Request-Id')][0]; } } return null; }