Skip empty cookie records. Add tests.

sanic/cookies/request.py

@@ -80,6 +80,8 @@ def parse_cookie(raw: str) -> Dict[str, List[str]]:
         # Support cookies =value or plain value with no name
         # https://github.com/httpwg/http-extensions/issues/159
         if not sep:
+            if not name:
+                continue  # Empty value like ;; or a cookie header with no value
             name, value = "", name
 
         if COOKIE_NAME_RESERVED_CHARS.search(name):  # no cov

tests/test_cookies.py

@@ -11,6 +11,20 @@ from sanic.cookies.request import CookieRequestParameters
 from sanic.exceptions import ServerError
 from sanic.response import text
 from sanic.response.convenience import json
+from sanic.cookies.request import parse_cookie
+
+def test_request_cookies():
+    cdict = parse_cookie("foo=one; foo=two; abc = xyz;;bare;=bare2")
+    assert cdict == {
+        "foo": ["one", "two"],
+        "abc": ["xyz"],
+        "": ["bare", "bare2"],
+    }
+    c = CookieRequestParameters(cdict)
+    assert c.getlist("foo") == ["one", "two"]
+    assert c.getlist("abc") == ["xyz"]
+    assert c.getlist("") == ["bare", "bare2"]
+    assert c.getlist("bare") == None   # [] might be sensible but we got None for now
 
 
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