code: public HttpClientBuilder secureSchema(String schema) {
  		if (sslHostConfig == null) {
  			throw new IllegalStateException("ssl(String) must be called before this");
  		}
  		sslHostConfig.secureSchema = schema;
  		return this;
  	}
docs: Configures secure schema for the HTTPS for current host
  (see {@link #ssl(String)}).
  
  @param schema	secure schema (usually, this is "https")
  @return this
  @see #ssl(String)