404 Not Found

<?php
ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(E_ALL);

session_start();

header('Access-Control-Allow-Origin: *');
header("Content-Type: application/json");

require_once('dbconnection.php');
// error_reporting(0);

$action = $_POST['action'] ?? "";

// Google reCAPTCHA secret key
$secretKey = "6LeLySAsAAAAAJiMq--0WDubHSJItXnxUk_exlQk";

// CAPTCHA CHECK
$captcha = $_POST['g-recaptcha-response'] ?? "";

if (!$captcha) {
    echo json_encode(["status" => "failed", "message" => "Captcha missing"]);
    exit;
}

// Verify captcha with Google
$verifyURL = "https://www.google.com/recaptcha/api/siteverify?secret=$secretKey&response=$captcha";
$response  = file_get_contents($verifyURL); 
$responseData = json_decode($response);

// echo json_encode($responseData);

if (!$responseData->success) {
    echo json_encode(["status" => "failed", "message" => "Captcha verification failed"]);
    exit;
}

// LOGIN ACTION
if ($action == "checklogin") {

$username = $_POST['username'] ?? "";
    $password = $_POST['password'] ?? "";
    $pass = md5($password);

// Check if user exists
    $sql1 = "SELECT * FROM login WHERE username='$username'";
    $res1 = mysqli_query($con, $sql1);

if (mysqli_num_rows($res1) == 0) {
        echo json_encode(["status" => "failed", "message" => "User Not Found"]);
        exit;
    }

// Validate password
    $sql2 = "SELECT * FROM login WHERE username='$username' AND password_enc='$pass'";
    $res2 = mysqli_query($con, $sql2);

if (mysqli_num_rows($res2) == 0) {
        echo json_encode(["status" => "failed", "message" => "Password is incorrect"]);
        exit;
    }

// SUCCESS
   
    $_SESSION['login_user'] = $username;

echo json_encode([
        "status" => "success",
        "message" => "Logged in successfully",
        "login_user" => $username
    ]);
    exit;

}

// DEFAULT
echo json_encode(["status" => "failed", "message" => "Invalid action"]);