public Builder setConnectionKeepAlive(final TimeValue connectionKeepAlive) {
            this.connectionKeepAlive = connectionKeepAlive;
            return this;
        }
Determines the default of value of connection keep-alive time period when not
explicitly communicated by the origin server with a {@code Keep-Alive} response
header.
<p>
A negative value is interpreted as an infinite keep-alive period.
</p>
<p>
Default: 3 minutes
</p>

@return this instance.
@since 5.0
httpclient5/src/main/java/org/apache/hc/client5/http/config/RequestConfig.java