in src/Support/Sign.php [109:121]
public static function rpcString($method, array $parameters)
{
ksort($parameters);
$canonicalized = '';
foreach ($parameters as $key => $value) {
if ($value === null || $value === '') {
continue;
}
$canonicalized .= '&' . self::percentEncode($key) . '=' . self::percentEncode($value);
}
return $method . '&%2F&' . self::percentEncode(substr($canonicalized, 1));
}