diff -r e651d5f24cb5 -r b01dd0ef43aa cubicweb/web/views/ajaxcontroller.py
--- a/cubicweb/web/views/ajaxcontroller.py	Wed Mar 13 13:37:49 2019 +0100
+++ b/cubicweb/web/views/ajaxcontroller.py	Thu Mar 14 14:43:18 2019 +0100
@@ -71,7 +71,6 @@
 
 from logilab.common.date import strptime
 from logilab.common.registry import yes
-from logilab.common.deprecation import deprecated
 
 from cubicweb import ObjectNotFound, NoSelectableObject, ValidationError
 from cubicweb.appobject import AppObject
@@ -444,16 +443,6 @@
     """remove user's session data associated to current pageid"""
     self._cw.session.data.pop(self._cw.pageid, None)
 
-@ajaxfunc(output_type='json')
-@deprecated("[3.13] use jQuery.cookie(cookiename, cookievalue, {path: '/'}) in js land instead")
-def set_cookie(self, cookiename, cookievalue):
-    """generates the Set-Cookie HTTP reponse header corresponding
-    to `cookiename` / `cookievalue`.
-    """
-    cookiename, cookievalue = str(cookiename), str(cookievalue)
-    self._cw.set_cookie(cookiename, cookievalue)
-
-
 
 @ajaxfunc
 def delete_relation(self, rtype, subjeid, objeid):