11. Actuator API
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11. Actuator API

The /gateway actuator endpoint allows to monitor and interact with a Spring Cloud Gateway application. To be remotely accessible, the endpoint has to be enabled and exposed via HTTP or JMX in the application properties.

application.properties.

management.endpoint.gateway.enabled=true # default value
management.endpoints.web.exposure.include=gateway

11.1 Retrieving route filters

11.1.1 Global Filters

To retrieve the global filters applied to all routes, make a GET request to /actuator/gateway/globalfilters. The resulting response is similar to the following:

{
  "org.springframework.cloud.gateway.filter.LoadBalancerClientFilter@77856cc5": 10100,
  "org.springframework.cloud.gateway.filter.RouteToRequestUrlFilter@4f6fd101": 10000,
  "org.springframework.cloud.gateway.filter.NettyWriteResponseFilter@32d22650": -1,
  "org.springframework.cloud.gateway.filter.ForwardRoutingFilter@106459d9": 2147483647,
  "org.springframework.cloud.gateway.filter.NettyRoutingFilter@1fbd5e0": 2147483647,
  "org.springframework.cloud.gateway.filter.ForwardPathFilter@33a71d23": 0,
  "org.springframework.cloud.gateway.filter.AdaptCachedBodyGlobalFilter@135064ea": 2147483637,
  "org.springframework.cloud.gateway.filter.WebsocketRoutingFilter@23c05889": 2147483646
}

The response contains details of the global filters in place. For each global filter is provided the string representation of the filter object (e.g., org.springframework.cloud.gateway.filter.LoadBalancerClientFilter@77856cc5) and the corresponding order in the filter chain.

11.1.2 Route Filters

To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. The resulting response is similar to the following:

{
  "[AddRequestHeaderGatewayFilterFactory@570ed9c configClass = AbstractNameValueGatewayFilterFactory.NameValueConfig]": null,
  "[SecureHeadersGatewayFilterFactory@fceab5d configClass = Object]": null,
  "[SaveSessionGatewayFilterFactory@4449b273 configClass = Object]": null
}

The response contains details of the GatewayFilter factories applied to any particular route. For each factory is provided the string representation of the corresponding object (e.g., [SecureHeadersGatewayFilterFactory@fceab5d configClass = Object]). Note that the null value is due to an incomplete implementation of the endpoint controller, for that it tries to set the order of the object in the filter chain, which does not apply to a GatewayFilter factory object.

11.2 Refreshing the route cache

To clear the routes cache, make a POST request to /actuator/gateway/refresh. The request returns a 200 without response body.

11.3 Retrieving the routes defined in the gateway

To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. The resulting response is similar to the following:

[{
  "route_id": "first_route",
  "route_object": {
    "predicate": "org.springframework.cloud.gateway.handler.predicate.PathRoutePredicateFactory$$Lambda$432/1736826640@1e9d7e7d",
    "filters": [
      "OrderedGatewayFilter{delegate=org.springframework.cloud.gateway.filter.factory.PreserveHostHeaderGatewayFilterFactory$$Lambda$436/674480275@6631ef72, order=0}"
    ]
  },
  "order": 0
},
{
  "route_id": "second_route",
  "route_object": {
    "predicate": "org.springframework.cloud.gateway.handler.predicate.PathRoutePredicateFactory$$Lambda$432/1736826640@cd8d298",
    "filters": []
  },
  "order": 0
}]

The response contains details of all the routes defined in the gateway. The following table describes the structure of each element (i.e., a route) of the response.

Path	Type	Description
`route_id`	String	The route id.
`route_object.predicate`	Object	The route predicate.
`route_object.filters`	Array	The GatewayFilter factories applied to the route.
`order`	Number	The route order.

11.4 Retrieving information about a particular route

To retrieve information about a single route, make a GET request to /actuator/gateway/routes/{id} (e.g., /actuator/gateway/routes/first_route). The resulting response is similar to the following:

{
  "id": "first_route",
  "predicates": [{
    "name": "Path",
    "args": {"_genkey_0":"/first"}
  }],
  "filters": [],
  "uri": "https://www.uri-destination.org",
  "order": 0
}]

The following table describes the structure of the response.

Path	Type	Description
`id`	String	The route id.
`predicates`	Array	The collection of route predicates. Each item defines the name and the arguments of a given predicate.
`filters`	Array	The collection of filters applied to the route.
`uri`	String	The destination URI of the route.
`order`	Number	The route order.

11.5 Creating and deleting a particular route

To create a route, make a POST request to /gateway/routes/{id_route_to_create} with a JSON body that specifies the fields of the route (see the previous subsection).

To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}.

11.6 Recap: list of all endpoints

The table below summarises the Spring Cloud Gateway actuator endpoints. Note that each endpoint has /actuator/gateway as the base-path.

ID	HTTP Method	Description
`globalfilters`	GET	Displays the list of global filters applied to the routes.
`routefilters`	GET	Displays the list of GatewayFilter factories applied to a particular route.
`refresh`	POST	Clears the routes cache.
`routes`	GET	Displays the list of routes defined in the gateway.
`routes/{id}`	GET	Displays information about a particular route.
`routes/{id}`	POST	Add a new route to the gateway.
`routes/{id}`	DELETE	Remove an existing route from the gateway.

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