Mastering the Cache-Manifest file configuration for optimal performance

I am experiencing a problem where even though I have my cache manifest, my website is not functioning correctly.

Currently, I am working with Visio 2012, using asp.net MVC.

Here are the steps I have taken so far:

I created a file called Manifest.manifest which includes the following lines of code:

CACHE MANIFEST

../Content/images/icons-18-white.png
../LegalEntity/IndexLegalEntity.cshtml
../Home/Index.cshtml 

In each View, I included the following:

<!DOCTYPE html>
<html manifest="~/Manifest/Manifest.manifest">

After accessing my website on Firefox, I allowed the browser to store data for offline usage. Then, I shut down IIS Express, making the website inaccessible.

Upon refreshing the page, Firefox notifies me that localhost is no longer available, which was expected. I then turn the browser into offline mode and can only access the Index page, none of the other views listed in the manifest.

My understanding was that every element in the manifest should be loaded into the offline cache as soon as the first page is accessed.

Additional information:

I have cleared my browser cache multiple times. I have refreshed the .manifest file. I have deleted the offline cache within the Mozilla/Firefox folder.

Could it be that I placed the manifest file in the wrong location? You may have noticed that it is located within a "Manifest" folder.

Any help or insights you can provide would be greatly appreciated!

Answer №1

Unfortunately, the Cache feature does not operate as a "Full Website Downloader" and simply directs the browser to store pages after the initial visit:

According to a source (link removed), an essential detail is highlighted in bold:

The manifest file consists of three sections:

CACHE MANIFEST - Files listed under this header will be stored after they are initially downloaded

NETWORK - Files listed under this section require server connection and will not be cached

FALLBACK - Files listed under this section specify backup pages in case a page becomes inaccessible

Therefore, it is necessary to visit all the pages at least once for them to be stored in the cache... This method is likely more suitable for Single Page Applications aimed at supporting offline usage rather than enabling complete website offline access.

UPDATE

Note that the information on the W3C website introduces a somewhat confusing example:

The opening line, CACHE MANIFEST, is mandatory:

CACHE MANIFEST

/theme.css

/logo.gif

/main.js

The provided manifest lists three resources: a CSS file, a GIF image, and a JavaScript file. Upon loading the manifest file, the browser will download these three files from the root directory of the website. Subsequently, even when the user lacks internet connectivity, the resources remain accessible.

The emphasized portion above is not entirely accurate. The browser will only download the file if it is requested on the page you are currently visiting (likely also if loaded via ajax, for instance) and maintain them in the cache.

UPDATE

App caches are gradually being phased out (source: https://html.spec.whatwg.org/multipage/browsers.html#offline) in favor of Service Workers for resource offline caching. This may explain why the earlier link is no longer functional.

For further details, please refer to the Mozilla developer network webpage: https://developer.mozilla.org/en-US/docs/Web/HTML/Using_the_application_cache

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