Follow along with the video below to see how to install our site as a web app on your home screen.
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I'm trying to open Mattermost on Nextcloud (use external site app).
I have been blocked there by the Contents Security Policty(CSP).
I wrote the following on Nextcloud nginx.
add_header Content-Security-Policy "frame-src MATTERMOST-URL";
add_header X-Frame-Options "allow-from...