HTTP 400 ys-torrentGrid cookie is too large

[elvetemedve]

As I see from the ticket ​http://dev.deluge-torrent.org/ticket/2295, grid settings are stored in the ys-torrentGrid cookie when using the Web UI.

Sometimes this ends up in a 400 Bad Request error, because the cookie is too large.

In case of Nginx web server I fixed it by increasing the value for large_client_header_buffers parameter.

My proposal is the following: Instead of a cookie, HTML5 local storage could be used to store these settings. This allows to store megabytes of data per domain, which is more than enough. While cookies are limited to few kilobytes.