Rfi Middleware not working correctly

[SlawomirLech95]

Hello, I found two bugs in "Rfi Middleware":

1. If the last input in request is url (Always $result is true),
2. The code bellow, also not checks urls because always method checkContent get "true", method checkContent should check items from matched items from the third parameter of preg_match function

if (!$result = preg_match($pattern, $this->applyExceptions($value))) {
    continue;
}

if (!$this->checkContent($result)) {
    continue;
}

"preg_match() returns 1 if the pattern matches given subject, 0 if it does not, or false on failure."

[denisdulici]

Feel free to send a PR, and I'd be more than happy to review and merge it.