[MUSIC]

With the registration part of the app in place it's time to add the log in

functionality.

In this part of the course we'll add a log in form so

users who've already registered can log into the website. In addition we'll

add a profile page to show the details for a logged in user.

This page should only be visible to someone who's logged in.

In other words, we need to add authentication to the profile page.

In the process, I'll teach you how to handle HTTP's stateless protocol, so

that we can keep track of our users as they visit our site.

As users click from page to page in our site, we'll use cookies and

sessions to keep track of users that are logged in.

Let me show you what we gonna build in the section of the course.

We'll add a log in form and a post route that does a few things.

It makes sure the user supplies values for email and password.

It makes sure the supplied email and password match a user in the database, and

finally, it authenticates users so that they can visit the profile page and

see information specific to them.

To do this, we'll need to add a new behind the scenes feature

to deal with the stateless nature of the HTTP protocol.

Time to learn about sessions and cookies.