Transferred size is bigger than size in inspection mode
If you go here https://support.mozilla.org/en-US/questions/new/desktop There is a gif file with dimension of 1x1 has the size of 35 B and transfer size of 459 B. Why is transfer size bigger than size? Even this happen as I am writing this support question lol. This thing always appear even on other website so you might want to check stuff out while in the wild. I have seen questions like this in SO. The comment says it is a bug and fixed in version 52 like a year ago. So whats up with transfer size?
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Can you account for the difference by looking at the length of the headers?
For example, this empty text file
https://www.userchrome.org/samples/userChrome.css
Network Monitor tool reports
- Transferred: 409 bytes
- Size: 0 bytes
If I count the characters in the Response Headers (raw), it's 381, plus 12 for line breaks, making 393.
I don't know where the discrepancy is. Maybe a gzip thing.
By the way, the Dev Tools team has a forum over here if you really want to dig into it:
I will find more examples. I once during my web dev testing got an image (not empty) with larger transfer size. Also some html and javascript with larger transfer size
lordsacha said
I will find more examples. I once during my web dev testing got an image (not empty) with larger transfer size. Also some html and javascript with larger transfer size
That makes sense: images in web formats are generally do not compress much more than an empty file, so when you account for overhead, the transferred size will be a bit larger than the image file. HTML, on the other hand, should compress well.