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When using flask-caching together with Flask's stream_template, JSON is produced rather than HTML.
Is this expected and am I missing something? I searched the docs but did not find mention of stream_template.
EDIT: It seems that render_template() returns an iterator which gets then retrieved as an array but upon retrieval it's not converted back
The issue is reproducible with:
To reproduce the issue:
Create a file app.py containing the following code
#! /usr/bin/env python3 from flask import Flask, render_template, stream_template from flask_caching import Cache config = { #"CACHE_TYPE": "RedisCache", # Flask-Caching related configs #"CACHE_TYPE": "SimpleCache", # Flask-Caching related configs "CACHE_TYPE": "NullCache", # Flask-Caching related configs "CACHE_DEFAULT_TIMEOUT": 300, "CACHE_REDIS_URL" : "unix:///var/run/redis/redis.sock" } app = Flask(__name__) # tell Flask to use the above defined config app.config.from_mapping(config) cache = Cache(app) @app.route("/") @cache.cached() def index(): return render_template('index.html') @app.route("/stream") def stream(): return stream_template('index.html') @app.route("/stream-cached") @cache.cached() def stream_cached(): return stream_template('index.html') if __name__ == '__main__': counter = 0 app.run()
Create a file templates/index.html with the following content
templates/index.html
<html> <body> <p> Hello World! </p> </body> </html>
Run the app with python3 app.py
python3 app.py
Expected behaviour is to obtain from all routes the following:
What happens insetead is that both / and /stream produce expected output while /stram-cached produces the following:
/
/stream
/stram-cached
[ "<html>\n <body>\n <p>\n Hello World!\n </p>\n </body>\n</html>" ]
Environment:
$ python --version Python 3.11.3
$ pip freeze blinker==1.6.2 cachelib==0.9.0 click==8.1.6 Flask==2.3.2 Flask-Caching==2.0.2 itsdangerous==2.1.2 Jinja2==3.1.2 MarkupSafe==2.1.3 redis==4.6.0 Werkzeug==2.3.6
The text was updated successfully, but these errors were encountered:
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When using flask-caching together with Flask's stream_template, JSON is produced rather than HTML.
Is this expected and am I missing something? I searched the docs but did not find mention of stream_template.
EDIT: It seems that render_template() returns an iterator which gets then retrieved as an array but upon retrieval it's not converted back
The issue is reproducible with:
To reproduce the issue:
Create a file app.py containing the following code
Create a file
templates/index.htmlwith the following contentRun the app with
python3 app.pyExpected behaviour is to obtain from all routes the following:
What happens insetead is that both
/and/streamproduce expected output while/stram-cachedproduces the following:Environment:
The text was updated successfully, but these errors were encountered: