public Builder setVersionPolicy(final HttpVersionPolicy versionPolicy) {
            this.versionPolicy = versionPolicy;
            return this;
        }
Determines the HTTP protocol policy. By default, connections are expected to use TLS ALPN
extension to negotiate the application protocol to be used by both endpoints.
<p>
Default: {@link HttpVersionPolicy#NEGOTIATE}
</p>

@return this instance.
httpclient5/src/main/java/org/apache/hc/client5/http/config/TlsConfig.java