jwebserver (and more generally HttpServer) may throw NullPointerException if a client attempts to send a CONNECT request:

Nov 20, 2023 2:50:47 PM sun.net.httpserver.ServerImpl$Exchange run
FINER: exchange started
Nov 20, 2023 2:50:47 PM sun.net.httpserver.ServerImpl$Exchange run
FINE: Exchange request line: CONNECT www.example.com:443 HTTP/1.1
Nov 20, 2023 2:50:47 PM sun.net.httpserver.ServerImpl$Exchange run
FINER: ServerImpl.Exchange
java.lang.NullPointerException: Cannot invoke "String.startsWith(String)" because "path" is null
at jdk.httpserver/sun.net.httpserver.ContextList.findContext(ContextList.java:68)
at jdk.httpserver/sun.net.httpserver.ContextList.findContext(ContextList.java:54)
at jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:776)
at jdk.httpserver/sun.net.httpserver.ServerImpl$DefaultExecutor.execute(ServerImpl.java:203)
at jdk.httpserver/sun.net.httpserver.ServerImpl$Dispatcher.handle(ServerImpl.java:566)
at jdk.httpserver/sun.net.httpserver.ServerImpl$Dispatcher.run(ServerImpl.java:531)
at java.base/java.lang.Thread.run(Thread.java:1570)