Fix typo

streamtg.py

@@ -116,7 +116,7 @@ async def handler(request):
         'Content-Length': str(length),
         'Accept-Ranges': 'bytes'
     }
-    if content_type := requests.headers.get('Content-Type'):
+    if content_type := request.headers.get('Content-Type'):
         headers['Content-Type'] = content_type
 
     async def download():