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by grepsedawk 2419 days ago
Nope... The packets need to be sealed back together, at that point the data is denormalized and you can't measure how much it "actually" counted.
2 comments

Huh? I happen to run my own intercepting proxy which rewrites HTML pages, and if I wanted to, I could easily track exactly how many bytes came in and how many bytes went out.
Yes? You can see how much you added, the size before and the size after.

This is not a technical impossiblity, I'm sorry if you're invested emotionally in it being impossible.