Php code not working as expected - php

Question

I have created a simple one user one password custom login to protect a specific page. In the page I want to protect (gallery.php) I have the following code:
<?php
session_start();
if (!$_SESSION["Login"]){
header("Location:index.php");
}
?>
<p>some protected content</p>
As so if user enters url http://www.example.com/pics/gallery.php
the pages take you to http://www.example.com/pics/index.php
In index I have the fallowing code:
<?php
session_start();
if(($_POST['username'] == "user1") && ($_POST['pass'] == "pass1"))
{
$_SESSION["Login"]= true;
header("Location:gallery.php");
}
else
{ ?>
<?php include 'header.php'; ?>
<div class="wlcm">
<div class="login-box wow fadeInUp">
<h2 class="lgn-tle">Please login</h2>
<form name="login" method="post" accept-charset='UTF-8'>
<input
type="text"
id="username"
name="username"
class="wow fadeInUp"
data-wow-delay=".2s"
placeholder="User"
required="true">
<input
type="password"
id="pass"
name="pass"
class="wow fadeInUp"
data-wow-delay=".4s"
placeholder="Password"
required="true">
<input
type="submit"
name="Submit"
class="submit wow fadeInUp"
data-wow-delay=".6s"
value="Login">
</form>
</div>
</div>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
echo "incorrect";
}
}
?>
While the code on gallery.php works and takes user to login.php if he's not already logged in. When I submit correct info in index.php I just get a blank page without any php errors.
It seems like header("Location:gallery.php"); doesn't do anything and I have tried absolute paths and spaces after "Location".
Am I missing something here?
All I want is a custom login using an html form instead of .htaccess and to do so in the simples and cleaner possible way.

Answer 1

Why you include login.php like <include'login.php'/>?
it should be <?php include 'login.php'; ?>
And form should have action set to login.php or index.php if you're checking if values are set on index.php