wcs: use deepcopy to prevent data leaking to other requests (#10709)

combo/apps/wcs/models.py

@@ -14,6 +14,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import copy
 import logging
 
 from django import template
@@ -142,7 +143,7 @@ class WcsBlurpMixin(object):
         else:
             wcs_sites = get_wcs_services()
 
-        wcs_sites = wcs_sites.copy()
+        wcs_sites = copy.deepcopy(wcs_sites)
         returns = set([])
         for wcs_slug, wcs_site in wcs_sites.items():
             url = wcs_site.get('url')