diff --git a/conf/local_settings.py.example b/conf/local_settings.py.example
index 917b6dc..506ac1b 100644
--- a/conf/local_settings.py.example
+++ b/conf/local_settings.py.example
@@ -18,3 +18,5 @@ EXTERNAL_LOGINS = {
         'use_smtp': False,
     }
 }
+FEEDBACK_ENDPOINT = 'https://example.com/bot/'  # or None
+FEEDBACK_KEY = '1145141919811'
diff --git a/frontend/views.py b/frontend/views.py
index ac83a2d..5636ef5 100644
--- a/frontend/views.py
+++ b/frontend/views.py
@@ -1,6 +1,7 @@
 import json
 from urllib.parse import quote
 from datetime import timedelta
+import requests
 
 from django.contrib import messages
 from django.contrib.admin import site
@@ -10,6 +11,7 @@
 from django.template.response import TemplateResponse
 from django.views import View
 from django.utils import timezone
+from django.conf import settings
 
 from server.announcement.interface import Announcement
 from server.challenge.interface import Challenge
@@ -258,6 +260,9 @@ def check_frequency(self, challenge_id):
         return too_frequent, latest
 
     def get(self, request, challenge_id):
+        # check if this is set, even as None
+        # to make admins quickly notice if they forgot this...
+        settings.FEEDBACK_ENDPOINT and settings.FEEDBACK_KEY
         challenge = self.check(challenge_id)
         if not challenge:
             return redirect('hub')
@@ -289,6 +294,31 @@ def post(self, request, challenge_id):
                 "latest_submit": latest,
                 "contents": contents,
             })
+        user = User.get(Context.from_request(request), request.user.pk)
+        # send to user-defined endpoint
+        if settings.FEEDBACK_ENDPOINT:
+            try:
+                response = requests.post(
+                    url=settings.FEEDBACK_ENDPOINT,
+                    headers={
+                        'Authorization': 'Bearer ' + settings.FEEDBACK_KEY,
+                    },
+                    json={
+                        'user_id': user.pk,
+                        'contents': contents,
+                        'challenge_name': challenge_name,
+                    },
+                    timeout=15
+                )
+                response.raise_for_status()
+            except (requests.exceptions.RequestException, requests.exceptions.HTTPError) as e:
+                messages.error(request, "反馈发送失败，请向管理员反馈此问题。")
+                return TemplateResponse(request, 'challenge_feedback.html', {
+                    "challenge_name": challenge_name,
+                    "too_frequent": too_frequent,
+                    "latest_submit": latest,
+                    "contents": contents,
+                })
         feedback = UnidirectionalFeedback.objects.create(challenge_id=challenge_id, user=request.user, contents=contents)
         feedback.save()