What is this net::ERR_NAME_NOT_RESOLVED error in php?

Question

Hello, I am trying to pass parameters to a php file, email and password, for login use by the following url:"http://www.vigilantescomunitarios.com/php/[email protected]&sen=12345" and the following warning appears

net:ERR_NAME_NOT_RESOLVED

Would the parameters be in trouble? Because when I run the url at hand "http://vigilantescomunitarios.com/php/login.php" wheel and of course, warns that the two variables are undefined

Notice: Undefined index: Ema in /var/www/vigilantescomunitarios.com/public_html/www/php/login.php on line 17

Notice: Undefined index: sen in /var/www/vigilantescomunitarios.com/public_html/www/php/login.php on line 18

Controller:

var ema = usuario.email;
var sen = usuario.senha;
$http.post("http://www.vigilantescomunitarios.com/php/login.php?ema="+ema+"&sen="+sen).success(function (response){
        console.log(response);
}

PHP:

<?php
ini_set('display_errors', true);
error_reporting(E_ALL);

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type,x-prototype-version,x-  requested-with');

include_once("conPDO.php");

$pdo = conectar();

$email = $_GET['ema'];
$senha = $_GET['sen'];
echo $email.' - '.$senha;
?>

Answer 1

The problem is that the site does not have the subdomain www.. For this reason error of not finding the domain is shown, because it does not exist. Removing the www. URL will not exist error. ;)

Solution:

Method 1 via Javascript:

$http.post("http://vigilantescomunitarios.com/php/login.php?ema="+ema+"&sen="+sen).success(function (response){
        console.log(response);
}

Simply remove the www..

But that doesn’t solve the whole problem!

Method 2 via Apache:

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

This will redirect the http://www... to the http://...

Method 2 via Nginx:

server {
    server_name www.vigilantescomunitarios.com;
    return 301 $scheme://vigilantescomunitarios.com$request_uri;
}

This will redirect the http://www... to the http://... or https://www... for https://....

To perform Method 2 you need to configure the DNS, thus pointing the subdomain and the domain to the same server.

For example:

Image and some information were extracted of this tutorial from Digitalocean. Configuration panel will vary from DNS to DNS.