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Fetching something over the network is both slow and expensive.
Large responses require many roundtrips between the client and server, which delays when they are available and when the browser can process them, and also incurs data costs for the visitor.
All you need to do is ensure that each server response provides the correct HTTP header directives to instruct the browser on when and for how long the browser can cache the response.
If you are using a Web View to fetch and display web content in your application, you might need to provide additional configuration flags to ensure that the HTTP cache is enabled, its size is set to a reasonable number to match your use case, and the cache is persisted.
Check the platform documentation and confirm your settings.
When the server returns a response, it also emits a collection of HTTP headers, describing its content-type, length, caching directives, validation token, and more.
For example, in the above exchange, the server returns a 1024-byte response, instructs the client to cache it for up to 120 seconds, and provides a validation token ("x234dff") that can be used after the response has expired to check if the resource has been modified.
Assume that 120 seconds have passed since the initial fetch and the browser has initiated a new request for the same resource.First, the browser checks the local cache and finds the previous response.Unfortunately, the browser can't use the previous response because the response has now expired.At this point, the browser could dispatch a new request and fetch the new full response.However, that’s inefficient because if the resource hasn't changed, then there's no reason to download the same information that's already in cache!That’s the problem that validation tokens, as specified in the ETag header, are designed to solve.The server generates and returns an arbitrary token, which is typically a hash or some other fingerprint of the contents of the file.The client doesn't need to know how the fingerprint is generated; it only needs to send it to the server on the next request.If the fingerprint is still the same, then the resource hasn't changed and you can skip the download.In the preceding example, the client automatically provides the ETag token in the "If-None-Match" HTTP request header.The server checks the token against the current resource.