Newbie help combining two scripts

[scidam]

For some reason my-url/get-temp does not do anything

You should be able to get current temperature just by typing my-url/get-temp in browser.
Try fake temperature values instead, e.g.

self.wfile.write(json.dumps({'temp_c': 10, 'temp_f': 10}))

If this works, the problem in the block that getting temperature.