Add support for key-only request parameters

2 files changed, 13 insertions, 2 deletions

diff --git a/requests_cache/cache_keys.py b/requests_cache/cache_keys.py
index 80cb6c5..2258d49 100644
--- a/requests_cache/cache_keys.py
+++ b/requests_cache/cache_keys.py
@@ -171,10 +171,15 @@ def normalize_json_body(
         return original_body
 
 
-# TODO: More thorough tests
 def normalize_params(value: Union[str, bytes], ignored_parameters: ParamList) -> str:
     """Normalize and filter urlencoded params from either a URL or request body with form data"""
-    params = dict(parse_qsl(decode(value)))
+    query_str = decode(value)
+    params = dict(parse_qsl(query_str))
+
+    # parse_qsl doesn't handle key-only params, so add those here
+    key_only_params = [k for k in query_str.split('&') if k and '=' not in k]
+    params.update({k: '' for k in key_only_params})
+
     params = filter_sort_dict(params, ignored_parameters)
     return urlencode(params)
 
diff --git a/tests/unit/test_cache_keys.py b/tests/unit/test_cache_keys.py
index f2d8c26..b02ffa9 100644
--- a/tests/unit/test_cache_keys.py
+++ b/tests/unit/test_cache_keys.py
@@ -34,6 +34,12 @@ def test_create_key__normalize_url_params(url, params):
     assert create_key(request) == CACHE_KEY
 
 
+def test_create_key__normalize_key_only_params():
+    request_1 = Request(method='GET', url='https://img.site.com/base/img.jpg?param_1')
+    request_2 = Request(method='GET', url='https://img.site.com/base/img.jpg?param_2')
+    assert create_key(request_1) != create_key(request_2)
+
+
 def test_normalize_request__json_body():
     request = Request(
         method='GET',