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Response has already been written
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Response has already been written
java.lang.IllegalStateException: Response has already been written	at io.vertx.core.http.impl.HttpServerResponseImpl.checkWritten(HttpServerResponseImpl.java:561)	at io.vertx.core.http.impl.HttpServerResponseImpl.end0(HttpServerResponseImpl.java:389)	at io.vertx.core.http.impl.HttpServerResponseImpl.end(HttpServerResponseImpl.java:328)	at co.uk.foo.webserver.server.WebServer.lambda$initialiseRoutes$0(WebServer.java:67)