A link checker found the following problem:

api/java.net.http/java/net/http/WebSocket.Builder.html:312: id not found: api/java.net.http/java/net/http/HttpRequest.html#securitychecks

It looks like the target existed in JDK 9, but it disappeared by JDK 11.

Looks like this is the offending line in WebSocket.java:

         * <a href="HttpRequest.html#securitychecks">Security checks</a>

This is part of the "noise" preventing us from reaching a goal of no broken links.