exception when duplicate header count is greater than 2

[viretp]

This is not possible to add several times the same header name, we get following exception:

2025-01-30 08:56:28.965 WARNING pool-2-thread-1  robaho.net.httpserver.ServerImpl$Exchange run [http:9101] ServerImpl unexpected exception 
java.lang.UnsupportedOperationException
	at java.base/java.util.AbstractList.add(AbstractList.java:155)
	at java.base/java.util.AbstractList.add(AbstractList.java:113)
	at robaho.httpserver/robaho.net.httpserver.OptimizedHeaders.add(OptimizedHeaders.java:97)
	at robaho.httpserver/robaho.net.httpserver.Request.headers(Request.java:202)
	at robaho.httpserver/robaho.net.httpserver.ServerImpl$Exchange.runPerRequest(ServerImpl.java:713)
	at robaho.httpserver/robaho.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:626)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at java.base/java.lang.Thread.run(Thread.java:1583)

Note that when using the jdk httpserver this problem does not occur.

I have investigated the code and found the problem in method robaho.net.httpserver.OptimizedHeaders.add

I have added a test reproducing the problem and implemented a fix: I will make a pull request with a proposal.

[viretp]

Pull request with my proposal: #18

[robaho]

resolved in 1.0.22