PHP Page Not Found error even though page exists

Question

When I invoke http://localhost/myapp , this is displaying the login screen (index.php) and after accepting and validating the credentials, throws a 404 Page Not found error. When I debugged, it goes into the "if" statement but fails to load the page. dashboard.php is available under views folder.

index.php

    //validation section

    if($usr2)
    {
            header('location: http://localhost/myapp/application/views/dashboard');
            //redirect("http://$_SERVER[HTTP_HOST]/myapp/application/views/dashboard");
    }

.htaccess (in the htdocs folder)

    RewriteEngine on
    RewriteBase /myapp/
    RewriteRule ^(.*)$ - 
    #RewriteCond $1 !^(index\.php) 
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php?$1
    # browser requests PHP
    RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^\ ]+)\.php
    RewriteRule ^/?(.*)\.php$ /$1 [L,R=301]
    # check to see if the request is for a PHP file:
    RewriteCond %{REQUEST_FILENAME}\.php -f
    RewriteRule ^/?(.*)$ /$1.php [L]

Answer 1

A bit late to answer, but capitalize "Location" and add the extension to your path:

header('Location: http://localhost/myapp/application/views/dashboard.php');