Cache support

[Parth589]

is there any way to cache the wasm file and other two worker and core files on client side? Because when user want to frequantly use the website they have to download files each time they open a new session. Is there any way to do this?

[juj]

If the wasm file is large, e.g. bigger than 5MB, then you'll need to implement manual caching using IndexedDB or OPFS - browsers have hardcoded limits for max file sizes that they cache: https://serverfault.com/questions/338722/what-is-the-maximum-file-size-that-will-be-cached-by-a-browser

If the wasm file is small enough, then the two common strategies are to use Last-Modified-Since caching or ETag caching or a hybrid of those. The client side code generated by Emscripten for this already will employ these mechanisms - you'll have to configure the server side with the appropriate Response Headers to make that work. https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching is a good starting point for caching.

[Alexufo]

@juj IndexedDB is not recommended, I believe.
WebAssembly/spec#821

Do you have more information about the 5mb threshold?

Is service-worker the best approach to caching wasm?