Why it should be re-opened
This question got closed by 1 moderator as being a duplicate. Even though I clearly stated that the questions marked as possible duplicate didn't answer my question and weren't about the same thing, the question hasn't been reopened yet. It took 9 minutes for my question to get closed and 1 hour after I have flagged it for moderator attention and edited it to highlight that it wasn't a duplicate, I still haven't got moderator feedback about the question.
In the question, it was stated I was looking for the limitation of browsers about the size of HTTP Headers. The question title says it's about browsers, the question body says it's about browsers and I even tagged it with
[browsers]. And yet, it got closed as duplicate of question about the servers limitation for HTTP Headers.
There even was someone who added this as comment after it was close :
Indeed, this is about User-Agent limitations, not server ones. If my experience is anything to go by, chances are those can be a lot lower. Voted to reopen. – Wrikken