What is Application Cache

What is Application Cache

HTML5 introduces application caching technology, which means that web applications can be cached and used without a network. By creating a cache manifest file, you can easily create offline applications.

The three advantages brought by Application Cache are:

① Offline browsing

② Improve page loading speed

③ Reduce server pressure

And all major browsers support Application Cache, even if it does not support it, it will not have any impact on the program

Offline Storage Technology

HTML5 proposes two major offline storage technologies: localstorage and Application Cache, both of which have their own application scenarios; the traditional offline storage technology is Cookie.

After practice, we believe that localstorage should store some non-critical ajax data as an icing on the cake;

Application Cache is used to store static resources, which is still an icing on the cake;

And cookie can only save a small piece of text (4096 bytes); so it cannot store big data. This is one of the differences between cookie and the above caching technology. Because HTTP is stateless, the server needs to distinguish whether the request comes from the same server. A server needs an identification string, and this task is completed by cookies. This text will be passed between the server and the browser every time to verify the user's permissions.

So the application scenarios of Application Cache are different, so the usage is inconsistent.