Fix crash in Save Page Now, when run without mocks

opdb/web_cache.py

@@ -123,7 +123,9 @@ class Session:
         )
 
     def _save_page_now(self, url: str) -> models.WebPageSnapshot:
-        response = self._session.get(f"https://web.archive.org/save/{url}")
+        response = self._session.get(
+            f"https://web.archive.org/save/{url}", allow_redirects=False
+        )
         response.raise_for_status()  # TODO: retry
         wayback_url = response.headers["Location"]
         return self._fetch_wayback_snapshot(url, wayback_url)