Partly fix #8581: add extra subdomains for cookie tests

tools/serve/serve.py

@@ -16,6 +16,7 @@
 from six.moves import urllib
 import uuid
 from collections import defaultdict, OrderedDict
+from itertools import chain, product
 from multiprocessing import Process, Event
 
 from localpaths import repo_root
@@ -700,6 +701,9 @@ def build_config(override_path=None, **kwargs):
 
     return rv
 
+def _make_subdomains_product(s, depth=3):
+    return set(u".".join(x) for x in chain(*(product(s, repeat=i) for i in range(1, depth+1))))
+
 _subdomains = {u"www",
                u"www1",
                u"www2",
@@ -708,6 +712,10 @@ def build_config(override_path=None, **kwargs):
 
 _not_subdomains = {u"nonexistent"}
 
+_subdomains = _make_subdomains_product(_subdomains)
+
+_not_subdomains = _make_subdomains_product(_not_subdomains)
+
 
 class ConfigBuilder(config.ConfigBuilder):
     """serve config