async def METHOD_NAME():
    issuer = await load_certificate(base_certs / 'ca_application.der')
    key_ca = await load_private_key(base_private / 'ca_application.pem')
    csr_file: Path = base_csr / 'myserver.csr'
    csr = x509.load_pem_x509_csr(csr_file.read_bytes())
    cert: x509.Certificate = sign_certificate_request(csr, issuer, key_ca, days=30)
    (base_certs / 'myserver.der').write_bytes(cert.public_bytes(encoding=Encoding.DER))