diff --git a/caricari/public.py b/caricari/public.py
index 5a5372a..1f310dc 100644
--- a/caricari/public.py
+++ b/caricari/public.py
@@ -3,6 +3,7 @@ from pathlib import Path
 from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker, joinedload
 from fastapi import FastAPI, HTTPException
+from fastapi.requests import Request
 from fastapi.responses import RedirectResponse, FileResponse
 from fastapi.templating import Jinja2Templates
 
@@ -23,9 +24,15 @@ session_pool = sessionmaker(bind=engine)
 def home():
     return "public archive"
 
+def get_format(path: str, request: Request) -> str:
+    # XXX: add some logic involving Accept, user-agent, etc.
+    return path.split('.')[-1]
+
 
 @app.get("/dl/{path:path}")
-async def get_file(path: str):
+async def get_file(request: Request, path: str, fmt: str = 'auto'):
+    if fmt == 'auto':
+        fmt = get_format(path, request)
     with session_pool() as conn:
         original = (
             conn.query(database.Original)
@@ -48,5 +55,9 @@ async def get_file(path: str):
         else:
             return 404
 
-    # XXX: handle ?accept=
+    # look for the "best" archived version
+    right_format = [arc for arc in original.archived
+                    if arc.format == fmt]
+    if right_format:
+        return RedirectResponse(right_format[0].link)
     return RedirectResponse(original.archived[0].link)