502 Bad Gateway errors are completely independent of your particular setup, meaning that you could see one in any browser, on any operating system, and on any device.
Try loading the URL again by pressing F5 or Ctrl-R on your keyboard, or by clicking the refresh/reload button.
While the 502 Bad Gateway error is usually indicating a networking error outside of your control, it could be extremely temporary. Trying the page again will often be successful.
Start a new browser session by closing all open browser windows and then opening a new one. Then try opening the webpage again.
It's possible that the 502 error you received was due to an issue on your computer that occurred sometime during this use of your browser. A simple restart of the browser program itself could solve the problem.
Clear your browser's cache. Outdated or corrupted files that are being stored by your browser could be causing 502 Bad Gateway issues.
Removing those cached files and trying the page again will solve the problem if this is the cause.
Delete your browser's cookies. For similar reasons as mentioned above with cached files, clearing stored cookies could fix a 502 error.