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Woo och, very enthusiastic.

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Now we're actually getting to the web app and writing code in this section, in this video we installed

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Express.

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Now we're ready to go, but we need to discuss what we're going to make with our first most basic pass

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at a web app.

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So here's a nice little hopefully you think it's nice a little diagram I made of a typical request and

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response cycle that we'll be working with in Express.

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So here's a computer.

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Let's say it's blues, my cats.

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And then there's our Express app that we'll be creating, which is node JavaScript and blue types in

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the name of our app.

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Let's just say it's WW dot app.com g hat center.

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A request is sent to our Express app saying, Hey, I would like the slash page.

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And Slash right here is referring to the the URL that we're asking for the path after.

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So if you notice, I'm on web dev slides dot com.

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This is basically like our entire Express app, but we'll be creating and then individual pages we ask

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for by varying what comes after the slash.

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So if you take a look, if you never noticed that before the path that comes after a slash and a web

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page, that is usually what dictates what content you see.

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So when we don't ask for anything, if I just go to a web dev slides, that's going to be the home page.

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And the way that we kind of write that is the path is slash just forward, slash nothing.

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Okay.

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So hi there.

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I'd like the home page, please.

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And then the express app has to figure out what to do.

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So that's sure.

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Here you go.

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And it sends back our super simple hello from our web app.

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That's it.

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It just is a one line of text.

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It says hello from a web app.

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No colors, no animations, nothing like that.

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And there's no logic involved to start.

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Every time blue goes to this page, she gets hello from our web app.

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Now what we're working towards is creating dynamic pages that will vary, that will say, hey, we have

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518 users, or here's a list of all of our users in the database or something like that.

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That varies depending on when the user asks for it, who the user is.

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There's a whole bunch of different conditions.

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So that's the flow we're trying to get.

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We send a request asking for a particular thing, and our Express app has to figure out, one, how

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to handle that.

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How does our Express app know what we're asking for?

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Second of all, how does it respond?

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So it's these two arrows that are really the important part, the request and the response.

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So let's get started.

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Here's what the code looks like.

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So there's a little bit here that we have well, we haven't seen any of this.

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We've seen requiring.

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So all we're doing is importing express and saving it into an express variable.

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Then we're doing this weird thing that we haven't seen where we're actually executing the entire express

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package that we just imported, and we're saving that to another variable called app.

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Basically, these are the first two steps of any express application, copy and paste them every time.

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I mean, they're not very long.

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So you could just type it, but you can treat them as just cookie cutter every time.

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Then every time we refer to this app like we have here app, get an app.

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Listen, both of those are referring to this app.

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So any time we work with Express, it's going to be a lot of app, not something app about get out,

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get app out, all these other things which on the documentation you can see over here we have all these

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app delete app that enable app get app list and app params, all these different things.

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They all start with app.

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Of course, if we name this variable something different Apple, then this would be Apple.

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Get an apple.

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Listen, so so far this doesn't do anything.

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These are just two lines to require stuff.

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The magic is really here and here.

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First thing is what's known as a root.

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This is the bread and butter of express, pretty much every web framework.

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What it does is this code inside is only triggered whenever a incoming request is made to this path.

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So we're basically defining the code that runs.

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When a user asks for a home page where the path is nothing, it's just slash and what are we going to

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do?

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Well, we are going to send this is a special method from Express.

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Hello from our web app.

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And Rez is coming from here.

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There's a lot to take in.

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I know Rez is the response object request is the incoming request.

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So every route there is a callback.

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Just like when we were working with my SQL.

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A callback is code that runs after something happens or at a later date.

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So this code only runs whenever a request is hit to slash.

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So eventually we'll have code where we have five or six routes, different web pages.

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We want to run different code depending on the web page that's being asked for.

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So this is how we do it.

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This is basically saying if a request comes in for slash run this code, we could have another one down

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here that says if a request comes in for a slash log out or slash log in, then do something else.

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Show the login page.

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So that's the first bit.

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Then every route has a function, a callback with two arguments, a request and a response request again

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is the incoming request.

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So if we wanted information from the, the incoming request from the user, which we'll be working with

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later, when a user types their email into the form to sign on to our wait list, that information is

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sent to us.

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And so we'll need to work with the request coming from the user into this arrow that will contain the

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information.

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Hello.

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I'd like to add my email blue at gmail.com to your database.

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And so then with the request we'd be able to pull it out of there.

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The response is what we're sending back.

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It's this arrow going that way.

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And so that's why Rez send hello from our web app.

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We'll send this response.

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Of course, you don't have to name it Rec and rez.

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You could call this request in response.

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You could call it R one and R two, apple and orange.

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All that matters is that you refer to it the same.

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And then we have the second component, and this is also kind of cookie cutter.

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You'll have this in every app app.

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Listen.

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And all that this does is starts a server.

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So this starts the server going we have to tell it what port which on cloud nine will always be using

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8080 and then if we want we can give it a callback function and this is just a line of code that will

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run once we start our server.

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So it will just say in our terminal, hey, your app's listing on port 80, 80, you don't have to have

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this.

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So let's go over to cloud nine.

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And the first thing I'm going to do is make a new file.

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So instead of join us new file.

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And it's going to be RPGs.

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And I'm going to just start by requiring express just like we saw

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then I'm going to do var app equals express which is referring to this executed as a function.

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So we have app there.

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Let's just see if it works.

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Nothing will happen.

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We may get an error if we didn't install express, but we did.

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So everything's good then let's start actually at the bottom with our app.

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Listen and we tell it the port, which is if you're not familiar with the idea of ports, think of it

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as the entry or exit point.

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On a computer.

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You can have 20, 50, 100 different ports for different things going on.

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At the same time, you may have had to work with ports if you ever had to mess with a firewall that

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was blocking something you didn't want it to block.

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Or if you work at an office where they I don't know, they don't allow you to go to certain websites

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that's running on a certain port.

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Anyways.

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APT listen A.D. 80 and we could just leave it at that like this.

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But if we do that and I start it up, notice my cursor has gone to the same thing that happened with

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the MySQL connection.

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When we didn't end the connection, it just hanging.

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And that's because I started the server it's listening and port 8080 to see any incoming requests but

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we're not doing anything and it's also just not very it's not a great experience to just see a blank

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cursor there so we can just add this blank callback and it will just console.log server running on 8080

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and it's just a nice message for us developers to see.

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So now if I do it you can see of course that we get console.log server running on 8080 and that's just

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because this code runs whatever we put in here, we'll run only once the server starts.

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So that's the first thing.

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But now we have the task of actually writing the code.

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So we have our server, it's going, but we can't actually reach it.

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We can't do anything with it.

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I don't have anything to respond with.

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So actually what I just said is kind of a lie.

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We can reach it, we could request it, but nothing would ever come back.

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And actually if I try and preview it right now.

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So to do that, we can click on preview preview running application.

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This is hitting this server, but we're not getting any response.

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So I'm going to just leave it here for now.

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We'll come back to that.

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We'll know that our app is working if we get a response here.

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To do that, we just have to do our app get and then the you are the path which is slash function request

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response.

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And then in here we put some code so we could start with just a console.log.

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Someone requested us just like that.

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What do you think will happen?

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First thing I have to do is restart the server.

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Anytime you change this code in here.

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The server was already running.

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We need to save the file and restart.

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But now if I try and request slash so I'll just hit enter here.

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Notice what happens.

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Says someone requested us because this code ran.

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But over here we still don't see anything.

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So console.log is only printing to the console here the terminal.

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So now what I'm going to do is open a new tab and put this in that tab so that we have our app and then

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our terminal down here.

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And I'm going to close this one just to make more space.

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It's the same thing.

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Notice, though, every time I hit enter, I get someone requested us.

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But if I tried to go to slash log out or something that doesn't exist, I don't get someone requested

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us because this code is only happening.

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It's only firing off when we're requesting a slash.

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And you might be wondering about the get part if you're not familiar with HTTP requests, there's a

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couple of different types.

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Different verbs get in post are what?

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We'll be working with a get request though.

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Think of it as just asking to see information.

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You're not sending any data with it.

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So when we are asking for our home page of join us, we're just trying to see information.

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It's a get request, but when we are trying to join, we are sending an email and that is going to be

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a post request.

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We'll get there in a little bit.

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I know it's a lot of stuff and overwhelming if you've never done web development.

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So hopefully you understand this is not a web dev course, but there are some great ones out there and

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I highly recommend if you're curious and you are enjoying this part that you continue down that path.

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Okay, enough of that.

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So rather than just console.log, there's this other thing we can do which is response send, and then

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we can put any string in here like you've reached the home page.

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I'm sorry about that siren.

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It's like 100 degrees in San Francisco today.

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That's a lie.

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It's 90 degrees.

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I have to have the window open.

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Okay.

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Hopefully it's not too loud.

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Now we need to restart the server.

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This time we now have some different code.

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Same thing if we hit Slash on this app that is running on 8080 which in cloud nine this is our URL.

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Yours will be different.

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You have a unique URL you need to access, but this is where your app will be running.

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Just like when we first installed Node and I showed you that chat app into same idea.

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This is where your app runs by default.

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So now all we need to do is hit that page, but we need to ask for slash rather than slash logout.

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If I do slash logout again, I get nothing.

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But if I just do slash or nothing, we get our message.

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You've reached the home page and that is our most basic web app.

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Of course, you could change this text.

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Something that people ask a lot is Can you have two reasons?

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And the answer is no.

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You can only have one.

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Every route is going to respond with one thing, but the real answer is that you're usually not going

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to use resend.

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You'll instead be responding with files.

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So we'll have a file of HTML to respond with our nice formatted page with style and fonts and colors.

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For now, this is a very basics, so we'll stop here.

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You can feel free to move on to the next video where we add more routes, but at the very end I'll take

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some time to review if anyone is curious or anyone feels like you need more review of how this works.

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So we started by requiring EXPRESS, which is the library of the framework we installed.

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Then we execute it and save it to our app variable.

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And really there's a lot of magic happening there.

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That's what a framework does.

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It takes care of stuff in the background, but now what we've done is first things first.

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We started up our server Atlas in 8080 and every time we do that our server starts running.

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And basically that is this block right here represented by this block, and it's just sitting here listening.

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It's a patient server.

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Nobody might talk to it for years or maybe ever, but as soon as someone sends a request and in our

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case the request goes to this URL node and my SQL learn was called C non users at IO.

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Yours will be different, but this is where I make a request to and that corresponds to our server.

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We started down here.

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So there's an invisible connection here that's kind of taken care of for us by cloud nine or by any

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computer, although your URL would be different if you weren't using Cloud nine, of course.

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But whatever we're running here, our server, it's waiting and listening for request coming in.

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Then we write code that differentiates between something like Log out or let's do log in.

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We don't have any code expecting log in.

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So that's why we get an error it says cannot get log in.

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I don't it's basically our server saying I don't know what you're talking about.

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All that our app knows about is Slash.

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That's the only thing it will respond with.

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Oh, I know that.

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Let me give you that.

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It's you've reached the home page.

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Otherwise we get.

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We cannot get whatever we do, but we do have this one case where it works.

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The homepage.

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And again, the typical terminology for this is the root, root, the home, the root, empty root,

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basically slash.

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So get slash.

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This code runs and all this code does is it responds with you've reached the home page.

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One thing that's interesting to take a look at, there's a lot here, but if I do a console.log request.

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This will contain all the information from the incoming request from this arrow.

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There's going to be a lot of stuff in there.

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So if we take a look, try it again and I make a request, I'll refresh it by clicking over here.

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We got printed out this giant thing.

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This is all the information contained in that request.

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So all of this is put together by Express.

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It's handled for us.

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Let's see if there's anything interesting to take a look at.

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Basically, I can't find anything terribly interesting or that it would be very useful without me having

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to explain a ton of other stuff.

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But this contains all the information and really you only get one or two things usually that you care

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about in here.

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This is all behind the scenes stuff that it works with.

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With that said, when we make our request that is sending our email, when we type it into a form and

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hit submit, that email will be contained in a request somewhere and we'll need to pull it out, which

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we'll get there at some point.

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All right.

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Next up, we're continuing on with this, but we're going to add a couple other routes.