If you see the code below, then you probably copied the wrong url to your browser, try to remove /wd/hub from its end.
Eg.: instead of localhost:4444/wd/hub try just localhost:4444
{"status":13,"value":{"class":"java.lang.NullPointerException","stackTrace":
[{"fileName":"ExternalSessionKey.java","lineNumber":75,"className":"org.openqa.grid.internal.ExternalSessionKey","methodName":"fromWebDriverRequest"},
{"fileName":"WebDriverRequest.java","lineNumber":60,"className":"org.openqa.grid.web.servlet.handler.WebDriverRequest","methodName":"extractSession"},
{"fileName":"RequestHandler.java","lineNumber":237,"className":"org.openqa.grid.web.servlet.handler.RequestHandler","methodName":"getSession"},
{"fileName":"RequestHandler.java","lineNumber":119,"className":"org.openqa.grid.web.servlet.handler.RequestHandler","methodName":"process"},
{"fileName":"DriverServlet.java","lineNumber":83,"className":"org.openqa.grid.web.servlet.DriverServlet","methodName":"process"},
{"fileName":"DriverServlet.java","lineNumber":61,"className":"org.openqa.grid.web.servlet.DriverServlet","methodName":"doGet"},
{"fileName":"HttpServlet.java","lineNumber":707,"className":"javax.servlet.http.HttpServlet","methodName":"service"},
{"fileName":"HttpServlet.java","lineNumber":820,"className":"javax.servlet.http.HttpServlet","methodName":"service"},
{"fileName":"ServletHolder.java","lineNumber":565,"className":"org.seleniumhq.jetty7.servlet.ServletHolder","methodName":"handle"},
{"fileName":"ServletHandler.java","lineNumber":479,"className":"org.seleniumhq.jetty7.servlet.ServletHandler","methodName":"doHandle"},
{"fileName":"SessionHandler.java","lineNumber":225,"className":"org.seleniumhq.jetty7.server.session.SessionHandler","methodName":"doHandle"},
{"fileName":"ContextHandler.java","lineNumber":1031,"className":"org.seleniumhq.jetty7.server.handler.ContextHandler","methodName":"doHandle"},
{"fileName":"ServletHandler.java","lineNumber":406,"className":"org.seleniumhq.jetty7.servlet.ServletHandler","methodName":"doScope"},
{"fileName":"SessionHandler.java","lineNumber":186,"className":"org.seleniumhq.jetty7.server.session.SessionHandler","methodName":"doScope"},
{"fileName":"ContextHandler.java","lineNumber":965,"className":"org.seleniumhq.jetty7.server.handler.ContextHandler","methodName":"doScope"},
{"fileName":"ScopedHandler.java","lineNumber":117,"className":"org.seleniumhq.jetty7.server.handler.ScopedHandler","methodName":"handle"},
{"fileName":"HandlerWrapper.java","lineNumber":111,"className":"org.seleniumhq.jetty7.server.handler.HandlerWrapper","methodName":"handle"},
{"fileName":"Server.java","lineNumber":349,"className":"org.seleniumhq.jetty7.server.Server","methodName":"handle"},
{"fileName":"AbstractHttpConnection.java","lineNumber":452,"className":"org.seleniumhq.jetty7.server.AbstractHttpConnection","methodName":"handleRequest"},
{"fileName":"BlockingHttpConnection.java","lineNumber":47,"className":"org.seleniumhq.jetty7.server.BlockingHttpConnection","methodName":"handleRequest"},
{"fileName":"AbstractHttpConnection.java","lineNumber":884,"className":"org.seleniumhq.jetty7.server.AbstractHttpConnection","methodName":"headerComplete"},
{"fileName":"AbstractHttpConnection.java","lineNumber":938,"className":"org.seleniumhq.jetty7.server.AbstractHttpConnection$RequestHandler","methodName":"headerComplete"},
{"fileName":"HttpParser.java","lineNumber":634,"className":"org.seleniumhq.jetty7.http.HttpParser","methodName":"parseNext"},
{"fileName":"HttpParser.java","lineNumber":230,"className":"org.seleniumhq.jetty7.http.HttpParser","methodName":"parseAvailable"},
{"fileName":"BlockingHttpConnection.java","lineNumber":66,"className":"org.seleniumhq.jetty7.server.BlockingHttpConnection","methodName":"handle"},
{"fileName":"SocketConnector.java","lineNumber":254,"className":"org.seleniumhq.jetty7.server.bio.SocketConnector$ConnectorEndPoint","methodName":"run"},
{"fileName":"QueuedThreadPool.java","lineNumber":599,"className":"org.seleniumhq.jetty7.util.thread.QueuedThreadPool","methodName":"runJob"},
{"fileName":"QueuedThreadPool.java","lineNumber":534,"className":"org.seleniumhq.jetty7.util.thread.QueuedThreadPool$3","methodName":"run"},
{"lineNumber":-1,"className":"java.lang.Thread","methodName":"run"}]}}
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