SecureServerSocket</a>
when making secure connections, including the server certificate.</p>
<p><code>file</code> is a PEM or PKCS12 file containing X509 certificates, starting with
the root authority and intermediate authorities forming the signed
chain to the server certificate, and ending with the server certificate.
The private key for the server certificate is set by <a href="dart-io/SecurityContext/usePrivateKey.html">usePrivateKey</a>. For
PKCS12 files, <code>password</code> is the password for the f