Support multipart HTML5 forms

services/api-server/src/api_server/html5_forms.py

@@ -6,6 +6,14 @@ from fastapi import Request
 
 
 async def html5_form_data(request: Request) -> dict[str, list[str]]:
+    content_type = request.headers.get("content-type", "")
+    if content_type.startswith("multipart/form-data"):
+        parsed = await request.form()
+        form: dict[str, list[str]] = {}
+        for key, value in parsed.multi_items():
+            text = getattr(value, "filename", None) if not isinstance(value, str) else value
+            form.setdefault(key, []).append(str(text or ""))
+        return form
     body = (await request.body()).decode("utf-8")
     return parse_qs(body, keep_blank_values=True)