JavaScript Save dataURL image to cache without a round trip to the server save todataurl image,save dataurl as image,save data url

In my web app, users drag images from their desktop onto the browser window. I then use FileReader's readAsDataURL to display the image in the browser, as I described here. I can then upload the image to the server. The JavaScript in the browser can know in advance what the new URL for the image is to be.

Is there a way to tell the browser: "Here is the data that you would download from this URL, but there's no need to download it because it's already available right here. Just use this."? My aim is to get the image into the browser's cache so that using the real URL (rather than the dataURL) will display the image. This means that the browser can take responsibility for unloading such images from memory when they are (temporarily) no longer displayed.

Do you have any suggestions on how to cut out unnecessary bandwidth usage?

Answer:1

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