Running an experiment with cookies blocked

orenrhockey

Hello!

When I block ALL cookies on my browser and run a test with a Worker with General Multiple permissions, I get an unexpected behaviour. There is a redirect to a different URL and then this error message appears:

However, when I go into the Results tab, I see that this session did in fact create a Study instance with the result ID 7116, and even is marked as Started:

Why is this occuring?

Is Jatos able to run experiments when all cookies are blocked?

Thanks!

kri

Hi!

JATOS needs cookies to work (first party cookies only). JATOS uses cookies to pass on information about the study run (e.g. study result ID, batch ID) from the JATOS server to the participant's browser where it is picked up by jatos.js. JATOS does not use third-party cookies (e.g. cross-site, tracker). More about JATOS' cookies and a description of each cookie and its fields you can find here: http://www.jatos.org/Data-Privacy-and-Ethics.html#cookies-used-by-jatos.

Best,

Kristian

orenrhockey

Thanks @kri

Any idea why the error message occurring would reference a specific result ID in that case?

Cheers!

kri

I admit the error message is confusing here. I will change it to something more meaningful that mentions that cookies should be allowed.

But the reason that the error msg mentions something specific as the result ID is okay. The JATOS internal flow is

1. Start study (puts cookie)
2. Redirect to start first component
3. Can't find cookie because they are forbidden in the browser
4. Throw error with result ID from URL query string (srid parameter)

Best,

Kristian