public Builder setCookieSpec(final String cookieSpec) {
            this.cookieSpec = cookieSpec;
            return this;
        }
Determines the name of the cookie specification to be used for HTTP state
management.
<p>
Default: {@code null}
</p>

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