problem with code integrity check

[rfakit]

hi i got this problem an onlyoffice is not working for me

Security & setup warnings
Transactional file locking should be configured to use memory-based locking, not the default slow database-based locking. See the documentation ↗ for more information.
SQLite is used as database. For larger installations we recommend to switch to a different database backend.
Especially when using the desktop client for file syncing the use of SQLite is discouraged.
To migrate to another database use the command line tool: 'occ db:convert-type', or see the documentation ↗.
Some files have not passed the integrity check. Further information on how to resolve this issue can be found in our documentation. (List of invalid files… / Rescan…)
The "X-XSS-Protection" HTTP header is not configured to equal to "1; mode=block". This is a potential security or privacy risk and we recommend adjusting this setting.
The "X-Content-Type-Options" HTTP header is not configured to equal to "nosniff". This is a potential security or privacy risk and we recommend adjusting this setting.
The "X-Robots-Tag" HTTP header is not configured to equal to "none". This is a potential security or privacy risk and we recommend adjusting this setting.
The "X-Download-Options" HTTP header is not configured to equal to "noopen". This is a potential security or privacy risk and we recommend adjusting this setting.
The "X-Permitted-Cross-Domain-Policies" HTTP header is not configured to equal to "none". This is a potential security or privacy risk and we recommend adjusting this setting.
You are accessing this site via HTTP. We strongly suggest you configure your server to require using HTTPS instead as described in our security tips.
Please double check the installation guides ↗, and check for any errors or warnings in the log.

[rfakit]

i followed your instruction but i got yellow box on the top that says
There were Problems with the code integrity check more information ...