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[MUSIC]

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We've set up our post resource and
we're able to view posts in our browser.

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But what's actually happening
when you load that URL?

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Your browser sends a request for the post
resource and the web framework, Rails,

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has to send back a response with some
HTML for the browser to display.

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Here's an overview of how
Rails processes a request.

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Rails looks at the request to figure
out which code should handle it.

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The request gets routed to
action method on a controller.

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The controller loads the resource in
from the database using a model class.

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Then the controller renders
a view using the model data

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to generate the response content.

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To retrieve the URL
http://localhost:3000/posts,

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your browser sends an HTTP get request.

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Your browser uses a communication standard
called Hyper Text Transfer Protocol or

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HTTP to talk to web servers.

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That's the HTTP at the start of the URL.

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Localhost:3000 is the host and the port.

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And /posts at the end is the path
of the resource you want.

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When you press enter to load the URL,

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your browser sends an HTTP get request,
it gets the page.

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There are other HTTP
requests types like post and

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delete too, we'll look at those later.

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If you'd like to learn more about the HTTP
protocol, just check the teacher's notes.

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If we switch to the terminal and
look in the log,

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we can see where Rails receives
the request and how it was handled.

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[SOUND] This log shows where
Rails received the request,

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passed it to a controller, loaded
some model data and rendered a view.

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Over the next few videos,
we'll look at each of these components.

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Right now we just want
to give you an overview.

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So don't worry about remembering
every detail you see.