Resolved Bugs
1222816 – python-tornado: XSRF cookie allows side-channel attack against TLS (BREACH)
1222819 – python-tornado: XSRF cookie allows side-channel attack against TLS (BREACH) [fedora-all]<br
Security fixes
The XSRF token is now encoded with a random mask on each request. This makes it safe to include in compressed pages without being vulnerable to the BREACH attack. This applies to most applications that use both the xsrf_cookies and gzip options (or have gzip applied by a proxy).
Backwards-compatibility notes
If Tornado 3.2.2 is run at the same time as older versions on the same domain, there is some potential for issues with the differing cookie versions. The Application setting xsrf_cookie_version=1 can be used for a transitional period to generate the older cookie format on newer servers.