I am not sure if it is a problem with Google Chrome, or maybe one of the extensions on my browser.
In last month, in many cases when crawling in Stackoverflow or meta site, browser open a download dialog (or display json content) instead of the requested HTML page.
I tried searching the meta, but couldn't find a duplicate bug.
Chrome version: 56.0.2924.87 (64-bit) OS: MacOs Sierra
UPDATE1: I disabled all my extensions, and the issue is still reproducible.
UPDATE2: It is reproducible in incognito mode. I tried to reproduce it on HTTPS, and I couldn't. But since it is a random bug, I am not sure if the issue is with http
UPDATE3: no error in console. But in case that I got the download popup, I tried to see the ajax call response, and it was empty. (I try to capture an image)
UPDATE4 I tried with other browsers (FF, Safari), and there was no problem. I also tried with a few other Mac machines, and I could reproduce the bug, but not on Windows machines.