avoid saving views in Angular.js

It appears that all of my HTML content is being completely cached in Chrome for some unknown reason.

Currently, I am using Angular 1.2 with a .NET Web API 2 project, and the content is being served in index.html.

Although I have not made any changes to the cache policy, everything seems to be heavily cached without reflecting any modifications made to the views until I manually clear the browser cache.

Even after pressing F5 or publishing the site to the server and refreshing, the new changes do not appear. The only solution is to either clear the browser cache explicitly or keep the console open with the "no caching while dev tools are open" setting set.

My goal is to avoid requiring users to clear their browser cache every time a new version is deployed.

Answer №1

Since no one seems to be sharing their thoughts, I'll go ahead and discuss the solution I've implemented. It's effective, but there is room for improvement.

IIS Configuration:

In your IIS settings, navigate to http features > http response headers > set custom headers > Expire Web Content: Immediately
(If you don't see http features, you will need to add this feature to your IIS server)

index.html Modifications:

<meta http-equiv="CACHE-CONTROL" content="NO-CACHE">
<meta http-equiv="CACHE-CONTROL" content="NO-STORE">
(These settings may cause compatibility issues with older versions of Internet Explorer)

The current approach works, but I believe finding a better caching balance between releases would be beneficial.

An alternative method could involve using a build tool like Grunt to generate unique filenames for scripts in production and updating links in index.html accordingly. This way, full caching can be enabled, ensuring that browsers always request the latest version of files due to unique filenames. (Some users append ?v=666 to files, but this isn't considered a reliable method)

If you are serving content from .Net pages instead of basic .html, consider using Bundler to manage tags across releases.

bundles.Add(new ScriptBundle("~/bundles/angular").Include("~/Scripts/angular/angular.js")
                                                 .Include("~/Scripts/angular/angular-route.js"));

This setup will produce something like

<script src="/bundles/angular?v=20LMOimhsS0zmHdsbxeBlJ05XNyVXwPaS4nt3KuzemE1"></script>

Update:

In addition, I have also started including a version parameter in template includes to prevent caching completely, although this should be tested thoroughly before implementation.

<div data-ng-include=" 'app/import/import-summary.html?v=' + appVersion "></div>

The variable "appVersion" can be a global variable defined in app.js

app.run(['$route', '$rootScope', function ($route, $rootScope) {
    $rootScope.appVersion = getBuildVersion(); // This value can be retrieved from assembly file versions or any other source where versions are generated by your build server
}]);

Answer №2

Occasionally, I encounter the same issue on my production server.

Most of the time, about 80% of the code I push to the server works fine. However, whenever I introduce a new module reference, an Angular binding, or even just a small change to a template, it takes multiple refreshes for the cache to clear and display the updated content.

I once drafted a lengthy question expressing my frustration and seeking others who faced similar issues. Ultimately, I deleted it thinking it was just a personal problem.

Interestingly, I discovered a workaround where hosting the site from my terminal using 'npm start' or 'http-server' modules forces synchronization between my development and production servers, prompting the browser to recognize the changes in both environments.

In my view, developers fall into two categories: modular and line-by-line asynchronous coders.

Modular developers tend to upload their code in large portions to minimize caching issues, while asynchronous programmers prefer making small updates, refreshing the browser frequently to observe incremental progress.

Personally, I align more with the asynchronous coding style due to its benefits in error detection and deepening my understanding of different programming languages.

Could it be that heavy browser caching associated with asynchronous programming is causing the challenges we're encountering with this specific situation?

I resonate with your frustrations as this has been a recurring challenge for me, especially in my exploration of Angular.

While it may seem like a minor inconvenience at first, the potential hours wasted reworking the same lines of code due to unreflected changes in the browser can significantly impact development time.

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