How to use HttpClient and HttpInterceptor to Cache Requests in Angular 5

Where's your example for when each template has it's file name changed to include it's own md5 hash? I'm assuming airtonix has this figured out, but for anyone else who ends up here.

angular 4 cache busting

A far superior method to all this complexity, I've found, is a simple directive applied to the element with the ng-include. Finally got sick and tired of this problem and came up with a different solution — that seems simpler and doesn't require any extensive configuration.

This will result in all of your app's URL's getting the suffix of '[?

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Skip to content. Instantly share code, notes, and snippets. Code Revisions 1 Stars 19 Forks 3. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist.

Learn more about clone URLs. Download ZIP. Cache busting for AngularJS partials is easy. This comment has been minimized. Sign in to view. Copy link Quote reply. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. In this example, we use the current timestamp, which will.

Even better would be to use a hash of the file's contents to ensure that the file is always.The new Angular seems familiar yet much more robust and productive since embracing object-oriented programming principles. I initially approached the problem with a simple solution but soon found some documentation related to the relatively new HttpClient API. HttpClient also supports registering an interceptor — a similar pattern to middleware in a modern webserver — via the HttpInterceptor interface.

And to my delight, they even included a caching example using the aforementioned tools. First, we have our subclass of HttpInterceptor called CacheInterceptor. Here, intercept is invoked any time a request is made. Then, once sendRequest is invoked, it calls next to execute the next operation similar to the middleware pattern.

Once the operation has completed we cache the response. In this example we are using a hard-coded cache time of 10 seconds for simplicity. Ok, so what about the cache? The cache is provided by a separate service called requestCache.

angular 4 cache busting

The cache is fairly simple. We have two instance methods: get and set. The second takes a key, value, and time-to-live — or ttl — and stores the data in a Map.

We use an in-memory Map here for storage, but you could use anything you need here to store the data. LocalStorage, for instance, would be suitable for longer term storage. With these two components, we have everything we need for a simple request caching interceptor in our Angular application. Providing an HttpInterceptor is fairly involved but there are good instructions on how to do that here.

Cache busting for an Angular app deployed with AWS S3 and CloudFront

For anyone investigating Angular HttpInterceptors for the first time, I hope this guide is helpful. Get notified when I write something new, hear about my escapades building software products, and get updates on new programming tutorials.

Subscribe Get notified when I write something new, hear about my escapades building software products, and get updates on new programming tutorials.In that case, You expect your users to start using a new version of your application and you will have to handle cache-busting during such release. In this post, I am going to share a checklist of things that you should do to bust the cache for an angular app deployed with AWS S3 and Cloudfront.

Also, you are using angular-cli. If you are using angular-CLI, then make sure that you are generating a production build. Your build output would look like this. Now, Notice that in our dist folder all files are having unique hashes in their names, except one file, index. Now, to deploy this build, we usually upload the dist folder on the s3 bucket and then we create distribution on CloudFront and set origin pointing to our s3 bucket. Whenever someone visits your website, a request goes to CDN and since we had deployed a new build with a new file name, it would be cache miss for those files on CDN and they will be retrieved from origin s3 bucket.

Angular 4 Tutorial 21: Advanced Routing

But, It would be a cache hit on the CDN side for index. So your users would not able to see the latest updated version of your app. We need to create behavior to tell CloudFront that it should never cache index. Check the screenshot of the configuration below.

So, This way we have handled cache busting on CloudFront side. Update Index. Add Meta tag with cache-control information in the index. This will make sure that index. So now whenever we make a release, users will get the latest version only. Skip to content. Create Behavior in your CloudFront distribution We need to create behavior to tell CloudFront that it should never cache index.

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This website uses cookies to ensure you get the best experience on our website. Learn more.When we were about to finish development of our applications in SwiftViews we noticed a pattern in all our data-fetching user flows.

Caching where? On the server? Maybe we could use service worker since it allows caching API calls?

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Yes, that was one of the options since it already has a pretty nice integration with Angular and allowed for a simple solution to selectively cache resources and APIs. However, what we wanted is to be able to not only choose what to cache, but also when to do it. Just to give you a quick example — we basically wanted to cache all API call results for the page below, but only if we were certain that the data source did not change in some way.

Since this is my personal inventory page, the only way it can actually change is if I add an item from this platform currently the only way to do soso I have the information about when this page will change and how long I can return cached content for. We figured the best way to apply this caching in a selective and configurable way will be to use what the platform already gives us.

So, before, this was our method which called our server to get the products on the page above:. Notice that the Cacheable has been applied just to the method we wanted and was also passed cacheBusterObserver which is basically our Subject-based mechanism to tell this exact decorated method to relieve all its caches, when any value is emitted in that stream.

This might be the most complex example we have but we also have other configurations implemented like maxCacheCount, maxAge, slidingExpiration and custom cache deciders and resolvers which give us a fine-grain control on what, when and how to cache.

The cacheable decorator is not applied yet, so every page load will actually fetch data from the server. The cacheable decorator is applied and we can see that all consecutive page loads are faster. Also, the cache busts after we add a new item so our user gets fresh data. So, to sum up, this simple decorator allowed us to:. If you want to use this decorator in your project, just install it from NPM! Also, if you liked the application, please register and build your own inventory swiftviews.

Sign in. Angel Nikolov Follow. The easiest solution was caching Caching where?If you have a localhost-target in your gruntfile, consider setting BuildNo to a fixed value, so you browser is not busted locally. Thank you for writing this. It has really helped me.

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I was just wondering if anyone could help in getting my Karma test to work for this? I am using the server to create a cache bust constant every time I run a build. I then pass this constant into the. I have tried adding it where the constants required in a service would go, but I guess that the Constant needs to get to the module prior to running a service as it runs during the configuration phase? Skip to content.

Instantly share code, notes, and snippets. Code Revisions 4 Stars 43 Forks Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. This comment has been minimized. Sign in to view. Copy link Quote reply. Cool now just how do we get cacheBustVersion.

angular 4 cache busting

Have Grunt build a file "config. BuildNo If you have a localhost-target in your gruntfile, consider setting BuildNo to a fixed value, so you browser is not busted locally. Great and simple!

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We have a Problem with our Angular 4 application regarding cache-busting. We use angular-cli --prod to build our application which should handle cache-busting when new versions are released.

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The compiled js-file-names contain a hash-number for every version so that files won't be cached. And the html should be included in the javascript-files. Still old template-stuff seems to be cached. One possible solution might be this one here: How to prevent Browser cache on Angular 2 site? Why should this change anything as not the template but js-files are requested?

Learn more. Asked 2 years, 4 months ago. Active 2 years, 4 months ago. Viewed 2k times. DominikP DominikP 1 1 silver badge 10 10 bronze badges. Did you make sure that it's not the main page index.

Actually this might be the problem. Is it good practise to use the cache-control meta-tag for this? Would this also effetc image-caching, javascript? Active Oldest Votes. The solution was to set cache-expires header for the index.

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Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.Browser-side caching is awesome, it makes your pages load faster, reduces network usage and improves perceived load times but it starts to become a real pain when you build an application that frequently rolls out client-side updates.

These updates propagate slowly to your end users with almost no way of being sure whether your bug still exists because you missed a test case or because the end user is simply still using the cached version of your JavaScript. There are a few cache-busting techniques you can get around this problem, some of them being.

angular 4 cache busting

The gulp plugin gulp-rev appends content hashes to the end of file names. This is great because hashes are only computed for files that have changed.

This way, the client always only downloads the assets that have changed. You need to install gulp-rev by running the command. Here, we have installed gulp-rev as a development dependency. It is assumed that you already have gulp installed and a basic gulpfile running.

Now, we create a task that handles the job of creating file revisions based on content hashes.

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The rev. Below is what a manifest looks like.

Improve your Angular app performance by using this simple Observable cache decorator 🎉

The problem here is that every time the hash changes you would have to manually update each reference. The below code samples pertain to ASP. NET and can be used similarly in the language of your choice. In the below sample we create a static method named version which takes in the path and returns the hashed file name.

Here we use to leverage the revision manifest to look for the updated hash file name. We also use runtime cache to avoid having to read the manifest for every request. It gets a bit challenging with angular templates.

Start by installing 2 more gulp packages. In the gulp task revision-html below, we create a separate revision file for html named rev-manifest-html. This task is a dependent task for the actual gulp task ng-revision.


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