Lazy load flask_compress

UI - Content compression was not obeying FLASK_ENABLE_COMPRESSION, should be off by default due to a memory leak in flask_compress & socket.io
2026-02-20 13:16:03 +00:00 · 2026-02-20 08:56:25 +01:00 · 2026-02-20 08:54:10 +01:00
1 changed files with 3 additions and 4 deletions
--- a/changedetectionio/flask_app.py
+++ b/changedetectionio/flask_app.py
@@ -27,7 +27,6 @@ from flask import (
    session,
    url_for,
 )
-from flask_compress import Compress as FlaskCompress
 from flask_restful import abort, Api
 from flask_cors import CORS

@@ -74,14 +73,14 @@ CORS(app)
 # There's also a bug between flask compress and socketio that causes some kind of slow memory leak
 # It's better to use compression on your reverse proxy (nginx etc) instead.
 if strtobool(os.getenv("FLASK_ENABLE_COMPRESSION")):
+    from flask_compress import Compress as FlaskCompress
    app.config['COMPRESS_MIN_SIZE'] = 2096
    app.config['COMPRESS_MIMETYPES'] = ['text/html', 'text/css', 'text/javascript', 'application/json', 'application/javascript', 'image/svg+xml']
    # Use gzip only - smaller memory footprint than zstd/brotli (4-8KB vs 200-500KB contexts)
    app.config['COMPRESS_ALGORITHM'] = ['gzip']
+    compress = FlaskCompress()
+    compress.init_app(app)

-compress = FlaskCompress()
-
-compress.init_app(app)
 app.config['TEMPLATES_AUTO_RELOAD'] = False
Author	SHA1	Message	Date
dgtlmoon	7a51f1e4bf	Lazy load flask_compress Some checks are pending Build and push containers / metadata (push) Waiting to run Details Build and push containers / build-push-containers (push) Waiting to run Details Publish Python 🐍distribution 📦 to PyPI and TestPyPI / Build distribution 📦 (push) Waiting to run Details Publish Python 🐍distribution 📦 to PyPI and TestPyPI / Test the built package works basically. (push) Blocked by required conditions Details Publish Python 🐍distribution 📦 to PyPI and TestPyPI / Publish Python 🐍 distribution 📦 to PyPI (push) Blocked by required conditions Details ChangeDetection.io App Test / lint-code (push) Waiting to run Details ChangeDetection.io App Test / test-application-3-10 (push) Blocked by required conditions Details ChangeDetection.io App Test / test-application-3-11 (push) Blocked by required conditions Details ChangeDetection.io App Test / test-application-3-12 (push) Blocked by required conditions Details ChangeDetection.io App Test / test-application-3-13 (push) Blocked by required conditions Details	2026-02-20 08:56:25 +01:00
dgtlmoon	91dee697f9	UI - Content compression was not obeying FLASK_ENABLE_COMPRESSION, should be off by default due to a memory leak in flask_compress & socket.io	2026-02-20 08:54:10 +01:00