Olli73

Download works out of the box, upload not. You must have a PHP Script, a CGI, a ISAPI dll or an own server to be able to upload files.

What did you install / configure on Apache server side to accept uploading files?

Not much information. I would also create a logging in the ISAPI dll.

Not sure, my experience with IIS is a long time ago, but it could be here: %SystemDrive%\inetpub\logs\LogFiles

Are you loading DLL's or other files you expect in root folder?

Servers mostly send only an "internal error", so that hackers have not much information about an issue (Vulnerability). So only a log on server can tell you more.

Your answer body in readable format: Could be an issue in your dll or other internal issues. Is your DLL 32 or 64 bit and it is propper configured in IIS? EDit: You must search / find a server log...

So you can add a sub item: LsubItem := ListView1.Items.Add; LSubItem.Text := 'Sub-Item'; LSubItem.Parent := LItem; But I think you should try TListBox. FMX list box is more comparable to VCL list view.

try OnPostedData event

Which error message? At which place (event) are you?

You try to read "parameters", but send data in body!? Then you must read body of request,

Is "data" variable of type string? Then try with Ansistring please,

"Access-Control-Allow-Origin: *" and Credentials / "Access-Control-Allow-Credentials: true" do not work together. Try with "Access-Control-Allow-Origin: null" or better a propper address.

I am aware of issues with AI, Too often AI has invented Delphi functions which would be practical but are not available. I wanted only mention what AI has to say about this...

OK, but Copilot tells me: