Dynamic plotly visualization (or image) in Flask Python

Question

I've got a plotly visualization ('viz.html') in a html format. I've embedded it in my webpage using Flask's url_for() syntax, referencing the static folder:

<iframe id="igraph" scrolling="no" style="border:none;" seamless="seamless" src="{{ url_for('static', filename='viz.html') }}" height="400" width="120%"></iframe>

It deploys with no issues. However, my 'viz.html' will be rewritten frequently, updating itself with new data points. The updated visualization won't show with a control + R or webpage refresh. If I press control + F5 and do a cache refresh, then updated visualization will show.

I want users to be able to see the updated visualization without having to manually refresh the cache. So far I've tried:

Reloading flask app when file changes are detected in 'static' folder (Reload Flask app when template file changes)

check_folder = './static'
check_files = []
for dirname, dirs, files in os.walk(check_folder):
    for filename in files:
        filename = os.path.join(check_folder, filename)
        check_files += [filename]
app.run(debug = True, extra_files = check_files)

Disabling browser cacheing on html page (http://cristian.sulea.net/blog/disable-browser-caching-with-meta-html-tags)

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />

Disabling Python on Flask Cacheing

resp.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
resp.headers["Pragma"] = "no-cache"
resp.headers["Expires"] = "0"

Would like to know, is what I'm trying to do even possible?

If it's possible how can I go about doing it? Advice appreciated!

Answer 1

I am not a web developer but I worked with a few closely for 3 years. As far as I know, there is no way to control what other browsers saved as cache. If my browser has a version saved in the cache, it will use that one. Usually, browsers will check if all the files are updated, and eventually, it will refresh for everyone. I actually heard developers being asked "why didn't you fix what I told you?" and they were like, "I have, just hard refresh." So I don't think there is a way. IDK if anything new is out there.