The application server is hanging and there is an error message in the logs:
2019/06/14 12:12:47.118 | Jun 14, 2019 12:12:47 PM org.glassfish.jersey.server.ServerRuntime$Responder writeResponse
2019/06/14 12:12:47.149 | SEVERE: An I/O error has occurred while writing a response message entity to the container output stream.
2019/06/14 12:12:47.197 | org.glassfish.jersey.server.internal.process.MappableException: org.apache.catalina.connector.ClientAbortException: java.io.IOException: An existing connection was forcibly closed by the remote host
2019/06/14 12:12:47.274 | at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:92)