I've given you a list of options that you can use to cache your simple logo.jpg url: use a bundler that automatically appends a hash (it can be as a querystring if you want, you can do logo.jpg?h=xxxxx, you can use etags so that the client checks with the server if they have the latest version of a resource, you can also use the last-modified headers to instruct the client to send an if-modified-since
I'll give you an extra one I learnt about recently: you can use a custom compression dictionary, although this is only available in chrome right now, which means even when a file needs to be redownloaded the network size is tiny as it's compressed with a custom dictionary that matches a previous version of the file
