[grid] Adding "/wd/hub" route to RouterServer

Helps backwards compatibility and should
facilitate users to start with Grid 4.

Fixes SeleniumHQ/docker-selenium#1235

Author: diemol

java/server/src/org/openqa/selenium/grid/commands/Hub.java

@@ -19,6 +19,7 @@
 
 import com.google.auto.service.AutoService;
 import com.google.common.collect.ImmutableSet;
+
 import org.openqa.selenium.BuildInfo;
 import org.openqa.selenium.cli.CliCommand;
 import org.openqa.selenium.events.EventBus;
@@ -179,11 +180,12 @@ protected Handlers createHandlers(Config config) {
     };
 
     Routable ui = new GridUiRoute();
+    Routable routerWithSpecChecks = router.with(networkOptions.getSpecComplianceChecks());
 
     HttpHandler httpHandler = combine(
       ui,
-      router.with(networkOptions.getSpecComplianceChecks()),
-      Route.prefix("/wd/hub").to(combine(router.with(networkOptions.getSpecComplianceChecks()))),
+      routerWithSpecChecks,
+      Route.prefix("/wd/hub").to(combine(routerWithSpecChecks)),
       Route.options("/graphql").to(() -> graphqlHandler),
       Route.post("/graphql").to(() -> graphqlHandler),
       Route.get("/readyz").to(() -> readinessCheck));

java/server/src/org/openqa/selenium/grid/router/httpd/RouterServer.java

@@ -20,6 +20,7 @@
 import com.google.auto.service.AutoService;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
+
 import org.openqa.selenium.BuildInfo;
 import org.openqa.selenium.cli.CliCommand;
 import org.openqa.selenium.grid.TemplateGridServerCommand;
@@ -63,6 +64,7 @@
 import static org.openqa.selenium.grid.config.StandardGridRoles.SESSION_MAP_ROLE;
 import static org.openqa.selenium.grid.config.StandardGridRoles.SESSION_QUEUER_ROLE;
 import static org.openqa.selenium.net.Urls.fromUri;
+import static org.openqa.selenium.remote.http.Route.combine;
 import static org.openqa.selenium.remote.http.Route.get;
 
 @AutoService(CliCommand.class)
@@ -143,10 +145,13 @@ protected Handlers createHandlers(Config config) {
       getServerVersion());
 
     Routable ui = new GridUiRoute();
+    Routable routerWithSpecChecks = new Router(tracer, clientFactory, sessions, queuer, distributor)
+      .with(networkOptions.getSpecComplianceChecks());
 
     Route handler = Route.combine(
       ui,
-      new Router(tracer, clientFactory, sessions, queuer, distributor).with(networkOptions.getSpecComplianceChecks()),
+      routerWithSpecChecks,
+      Route.prefix("/wd/hub").to(combine(routerWithSpecChecks)),
       Route.options("/graphql").to(() -> graphqlHandler),
       Route.post("/graphql").to(() -> graphqlHandler),
       get("/readyz").to(() -> req -> new HttpResponse().setStatus(HTTP_NO_CONTENT)));