code: public BaseHttp2ServerBuilder setTrustedClientCertificateChain(final File certificatePemFile) {
          this.trustedClientCertificatePemFile = certificatePemFile;
          this.trustedClientCertificateInputStream = null;
          this.trustedClientCertificates = null;
  
          return this;
      }
docs: <p>Sets the trusted certificate chain for the server under construction using the contents of the given PEM
  file. If not set (or {@code null}), the server will use the JVM's default trust manager.</p>
  
  <p>In development environments, callers will almost always need to provide a trusted certificate chain for
  clients (since clients in development environments will generally not present credentials recognized by the JVM's
  default trust manager).</p>
  
  @param certificatePemFile a PEM file containing one or more trusted certificates
  
  @return a reference to this builder