All posts tagged with debugging

Don't Trust SameSite defaults in Chrome

March 18, 2020 - Søren Alsbjerg Hørup

I had a hard time to reproduce the SameSite cookie issue between multiple Chrome browsers. The reason, as it would seem, was the the Default setting of the SameSite flags are NOT neccesarly the same between Browser instances.


My Chrome on my PC reported “Cookies without SameSite must be secure” to be enabled with default checked, while on my collegues PC, it reported as being disabled with default checked.

This made it impossible for him to reproduce the issue that I had an easy time to reproduce. We had the exact same version of Chrome and were both using Windows 10, although not exact same version of Windows.

Lesson learned: Do not trust the Defaults in Chrome when debugging, enfore the same settings across instances.

Break on Redirect in Chrome

March 14, 2020 - Søren Alsbjerg Hørup

I recently had to debug an issue where the browser redirected the user. Debugging this was a pain, since the browser would clear all my views in developer console whenever the redirect happened.

I thought there must be a better way and yes! a bit of googling and I found this Gem:

window.addEventListener("beforeunload", function() { debugger; }, false)

This will break whenever the beforeunload event is executing, which happens right before a redirect.

Simply copy and paste into the console, and you are good to go!

This allowed me to see the exact call-stack leading to the beforeunload event.

In my concrete case the issue was related to a Cookie not being set due to SameSite not being set in a Cookie, which is a requirement by Chrome since version 80.