def put(uri, body = nil, headers = {})
      request :put, uri, body: body, headers: headers
    end
def put(uri, body = nil, headers = {})
      request :put, uri, body: body, headers: headers
    end
Send a PUT request.
 @param uri (see #post)
 @param body (see #post)
 @param headers (see #post)
 @return (see #request)