@app.route('/', subdomain='sub')
def subdomain():
    return 'This is the subdomain'

@app.route('/', subdomain='sub')
def subdomain():
    return 'This is the subdomain'

This site can’t be reachedCheck if there is a typo in <URL>.
If spelling is correct, try running Windows Network Diagnostics.
DNS_PROBE_FINISHED_NXDOMAIN

This site can’t be reachedCheck if there is a typo in <URL>.
If spelling is correct, try running Windows Network Diagnostics.
DNS_PROBE_FINISHED_NXDOMAIN