fix(api): accept slashless api urls

src/apps/core/middleware.py

@@ -9,6 +9,7 @@ import threading
 import uuid
 
 from django.middleware.csrf import CsrfViewMiddleware
+from django.urls import Resolver404, resolve
 from django.utils.deprecation import MiddlewareMixin
 
 logger = logging.getLogger(__name__)
@@ -28,6 +29,34 @@ class ApiCsrfExemptMiddleware(CsrfViewMiddleware):
         return super().process_view(request, callback, callback_args, callback_kwargs)
 
 
+class ApiSlashlessRouteMiddleware(MiddlewareMixin):
+    """Route slashless API URLs to existing slash URLs without POST redirects."""
+
+    api_prefixes = ("/api/",)
+
+    def process_request(self, request):
+        path_info = request.path_info
+        if not path_info.startswith(self.api_prefixes) or path_info.endswith("/"):
+            return None
+
+        try:
+            resolve(path_info)
+            return None
+        except Resolver404:
+            pass
+
+        slash_path_info = f"{path_info}/"
+        try:
+            resolve(slash_path_info)
+        except Resolver404:
+            return None
+
+        request.path_info = slash_path_info
+        request.path = f"{request.path}/"
+        request.META["PATH_INFO"] = slash_path_info
+        return None
+
+
 def get_request_id() -> str | None:
     """Get current request ID from thread-local storage."""
     return getattr(_request_context, "request_id", None)

src/settings/base.py

@@ -166,6 +166,7 @@ MIDDLEWARE = [
     "django.middleware.security.SecurityMiddleware",
     "whitenoise.middleware.WhiteNoiseMiddleware",
     "django.contrib.sessions.middleware.SessionMiddleware",
+    "apps.core.middleware.ApiSlashlessRouteMiddleware",
     "django.middleware.common.CommonMiddleware",
     "apps.core.middleware.ApiCsrfExemptMiddleware",
     "django.contrib.auth.middleware.AuthenticationMiddleware",