[Python] Disabling caching in Flask [duplicate]

I have some caching issues. I'm running very small web-application which reads one frame, saves it to the disk and then shows it in browsers window.

I know, it is probably not the best solution, but every time I save this read frame with the same name and therefor any browser will cache it.

I tried to use html meta-tags - no success:

<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" />


Also, I have tried this one (flask-specific):

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


This is how I tried to modify resp headers:

r = make_response(render_template('video.html', video_info=video_info))

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


Still both Google Chrome and Safari do caching.

What might be the problem here?

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