Discussion on: Framework-less REST API in Java

[Michał]

I have a generated XML data file. I want it to be available in Endpoint instead of "hello".

[Michał]

In conclusion, I want to type localhost: 8080 / XML and see the data from the XML file I have in the folder.

[Marcin Piczkowski]

Instead of hardcoded text just read the file content as bytes. The rest is the same.
I'm sure you can google out plenty of examples like this one:

 Path path = Paths.get("C:/temp/test.xml");
 byte[] data = Files.readAllBytes(path);

Then :

exchange.getResponseHeaders().put("Content-Type", "text/xml");
exchange.sendResponseHeaders(200, data.length);
OutputStream output = exchange.getResponseBody();
 output.write(data);
 output.flush();
 exchange.close();

Haven't checked it compiles but give it a try.