Fix exception logging

app.py

@@ -3,6 +3,7 @@ import json
 import logging
 import mimetypes
 import os
+import traceback
 import urllib
 from datetime import datetime
 from datetime import timezone
@@ -404,7 +405,9 @@ def is_api_request():
 
 @app.errorhandler(ValueError)
 def handle_value_error(error):
-    logger.error(f"caught value error: {error!r}, {error.__traceback__!r}")
+    logger.error(
+        f"caught value error: {error!r}, {traceback.format_tb(error.__traceback__)}"
+    )
     response = flask_jsonify(message=error.args[0])
     response.status_code = 400
     return response
@@ -412,7 +415,9 @@ def handle_value_error(error):
 
 @app.errorhandler(Error)
 def handle_activitypub_error(error):
-    logger.error(f"caught activitypub error {error!r}, {error.__traceback__!r}")
+    logger.error(
+        f"caught activitypub error {error!r}, {traceback.format_tb(error.__traceback__)}"
+    )
     response = flask_jsonify(error.to_dict())
     response.status_code = error.status_code
     return response