filter.watch() does not handle sticky sessions

[ianthpun]

Currently, filter.watch() doesn't seem to support sticky sessions. The initial call to web3.eth.filter('latest') does not hold the cookies set from the response

[ianthpun]

I noticed that HTTPProvider uses XMLHttpRequest(), which has the option to set withCredentials = true, allowing for set-cookie to work for cookie-based sticky sessions. Is there a reason why this was not set to true or why there is no option to?

[edevil]

I also have this problem. I access a parity node farm behind a load-balancer that sets sticky sessions based on cookies. Some of the flows like creating and using filters require that we reach the same node. If the correct cookie value is not sent when we want to fetch events from the filter we just created this will not work.

@ianthpun did you manage to get this to work?

[frozeman]

I merged and fixed the tests, can you test develop?