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So, as promised, this time around, I want to not use the pat router, instead, I want to use the



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key router and let's have a look at that.



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So over on my Web browser, I go here to GitHub, Dotcom, Shūgo, Dash, Kiguchi.



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And when I look at the actual description of this, it seems pretty good.



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It's a good writer.



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It's it's it's lightweight.



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It's fast.



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It's absolutely compatible with the standard library net HTP.



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It seems to be exactly.



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Are very useful.



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And one of the other nice things about this is if you scroll down you'll see it has some built in middleware,



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which we haven't talked about yet, but we're going to in the upcoming lectures, middleware allows



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us to process requests as they come in and make decisions about what to do with them.



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So, for example, I might have some pages on my site that I only want logged in users to see.



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And middleware is a great place to determine whether or not a user has the necessary rights to see that



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page.



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So it has a whole bunch of built in middleware.



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And you can see there there's all kinds of them listed right here and you can read those at your leisure



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will be using some of them, some of them in the next few minutes.



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All right.



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So how do I install this?



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Well, this is the same process we used to install, Pat.



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So let's find the install part.



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Should be go get somewhere in this page.



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Go get there it is install.



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Go get.



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So I'm going to copy that, go back to my ID, open a terminal window, stop my application because



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I had it running and I'll clear the screen and simply paste that command in and it goes and gets it.



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And again, if we look at our Gadot mod file, which is right here, it's now an important GOCE.



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It still has Pat, and we're still using Pat, but we're not going to be in just a moment.



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So how do I use this?



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Let me go back to my roots folder and let me just delete everything in the middle here.



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I'll just comment to that.



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All right, so now it says, we're not using Pat, you're not using handlers and we will be in a minute,



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so don't ignore those errors if you see them, instead of creating a new mux that is a type of pat,



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let me create a mux that is of type Chey dot newsreader.



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All right.



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So it got rid of Pat up here because we're not using it anymore.



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It's still in our go mode file, which I can show you right here.



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We don't want that.



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Now, you could manually delete this, but we're not going to will simply do a much cleaner method,



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will go down to our terminal window and say go mode tidy, tidy up my mod file, and when I do, it



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actually gets rid of unused packages.



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OK, so you're going to be doing that periodically and later on I'll show you how to update your dependencies



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so you may draw in a third party package that's updated and has some new features and you want to use



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the new version, but we'll get to that later on.



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Right now, we're just putting a restaurant.



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So I've created my new key router and I have a Mac and I'm returning the mux.



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Now, I want to have these pads matched in our router the same as we did before.



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So it's a very similar approach.



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Mux dot get the pattern is slash for home and I'm just going to go handler's repo, not home.



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Now, that seems like it works pretty well.



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OK, let's copy that one and do the one for boat route home.



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A report a boat seems to have worked.



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Let's compile it and see what happens.



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Go run command web main first sorry, StarTalk, go it compiled seems to be running.



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Let's go to our Web browser and open a new window and go to localhost.



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Eighty, eighty.



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There's the homepage perfect, and let's have a look at our about page to make sure that works about



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very good, that works extremely well.



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Now, why did I go to all the trouble of changing Rotor's?



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Well, the first to start with it was actually just to show you that it's not that difficult if you



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keep things separated from one another and keep things really clean.



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You can swap out an entire component of your package in just a couple of minutes, which is exactly



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what we just did.



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But there are other reasons I want to use this particular router as well.



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So I'm going to get rid of this commented code and I'm going to install some middleware.



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Now, as I said, middleware actually allows you to process a request as it comes into your Web application



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and perform some action on it.



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Well, let's go back to our Web browser and look at the list of middleware, which is way down here



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somewhere.



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There it is.



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Let's look at some of these.



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Some of these actually seem pretty good.



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Here's one.



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Recover gracefully, absorbs panic's and prints the stack trace.



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So sometimes hopefully not very often if you've if you've coated carefully, but sometimes your application



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will panic and a panic says, oh, no, the world is coming to an end, I am going to die, and your



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application just dies.



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What you would want to do instead is say, oh, no, something really bad happened.



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Here's some useful information about what went wrong and now I'm going to recover from that panic.



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So maybe I want to use this Rickover Middleware.



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Well, how do I do that?



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Well, it's actually pretty easy.



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I can just say mux don't use middleware, which is one of the things built into CZI and I want to find



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the Rickover.



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So Rickover, that's it.



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And I don't want those parentheses.



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That's it.



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So when I put that middleware in place because I've used it before these roots, it's actually available



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to us now.



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Are there any other ones that I want to put in there?



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Well, at the moment, let's have a look and just make sure.



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Is there anything else I want to use in those middleware?



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So let's find them again, allow content type basic auth.



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Not here, but basically if I want to use a more more secure version of authentication compress that'll



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be handled by my Web server.



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Don't care about that monitoring endpoint logger.



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What's Logger do logs the start and end of each request with the elapsed processing time.



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Now that'll be available to me in other ways.



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Well, for right now I'm not too worried about the rest of this.



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This seems to me like it might be OK.



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So we're going to make some more middleware and we'll do that in the next lecture.



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But for right now, this is pretty good.



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We have this running.



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So let's stop right now.



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In the next lecture, we'll look at actually writing our own middleware and using that in here, because



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sometimes what you need just doesn't come out of the box with your router.



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Actually, quite often it doesn't come out of the box with your router.



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So we'll write some basic middleware and add those in the next lecture.