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Do you have any more questions about this?

Sorry, I don't understand what that means.

How is that related to your problem?

Have you tried testing with a localhost server?

My understanding of a server is that it will respond to requests. The client sends a request and the server will do what it is programmed to do.
What kind of server are you testing with?

Are you asking about How would your code write to a file on the server? That would be controlled by the code on the server.