Recommended way to check file size on upload

Question

I am working on a web application which supports file uploading. I am already familiar checking the size in server side, but i wanted to check the file size in a client side.

Answer 1

I haven't tested this, but isn't there a "Content-Length" header on the request? It will include more than just the file being uploaded, but you can use it as a benchmark to determine if the POST is too large to handle.