Why data exchange between 2 web apps using redirection with query parameters or auto-form-post CANNOT be trusted by each other, even when using HTTPS?

Why data exchange between two web applications using redirection with query parameters or auto-form-post CANNOT be trusted by each web application, even when using HTTPS?
Note:
I understand that data exchange using query parameters has inh… Continue reading Why data exchange between 2 web apps using redirection with query parameters or auto-form-post CANNOT be trusted by each other, even when using HTTPS?

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How to secure user folders on the server from the scripts running in other user folder on the same server?

I have a VPS. There is a web-application running on this VPS.
A user can log into his account, create a project (the system automatically creates a folder for this project) and then, he can create and edit PHP files via the file manager wi… Continue reading How to secure user folders on the server from the scripts running in other user folder on the same server?