This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Cloud Gateway 4.2.0!

Actuator API

The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. To be remotely accessible, the endpoint has to be enabled and exposed over HTTP or JMX in the application properties. The following listing shows how to do so:

application.properties

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

This endpoint provides an overview of what is available on the child actuator endpoint and the available methods for each reference. The resulting response is similar to the following:

[
   {
      "href":"/actuator/gateway/",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/routedefinitions",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/globalfilters",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/routefilters",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/routes",
      "methods":[ "POST", "GET" ]
   },
   {
      "href":"/actuator/gateway/routepredicates",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/refresh",
      "methods":[ "POST" ]
   },
   {
      "href":"/actuator/gateway/routes/route-id-1/combinedfilters",
      "methods":[ "GET" ]
   },
   {
      "href":"/actuator/gateway/routes/route-id-1",
      "methods":[ "POST", "DELETE", "GET" ]
   }
]

Verbose Actuator Format

A new, more verbose format has been added to Spring Cloud Gateway. It adds more detail to each route, letting you view the predicates and filters associated with each route along with any configuration that is available. The following example configures /actuator/gateway/routes:

[
  {
    "predicate": "(Hosts: [**.addrequestheader.org] && Paths: [/headers], match trailing slash: true)",
    "route_id": "add_request_header_test",
    "filters": [
      "[[AddResponseHeader X-Response-Default-Foo = 'Default-Bar'], order = 1]",
      "[[AddRequestHeader X-Request-Foo = 'Bar'], order = 1]",
      "[[PrefixPath prefix = '/httpbin'], order = 2]"
    ],
    "uri": "lb://testservice",
    "order": 0
  }
]

This feature is enabled by default. To disable it, set the following property:

application.properties

spring.cloud.gateway.actuator.verbose.enabled=false

This will default to true in a future release.

Retrieving Route Filters

This section details how to retrieve route filters, including:

Global Filters
Route Filters

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.ReactiveLoadBalancerClientFilter@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 the details of the global filters that are in place. For each global filter, there is a string representation of the filter object (for example, org.springframework.cloud.gateway.filter.ReactiveLoadBalancerClientFilter@77856cc5) and the corresponding order in the filter chain.

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

Refreshing the Route Cache

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

To clear the routes with specific metadata values, add the Query parameter metadata specifying the key:value pairs that the routes to be cleared should match. If an error is produced during the asynchronous refresh, the refresh will not modify the existing routes.

Sending POST request to /actuator/gateway/refresh?metadata=group:group-1 will only refresh the routes whose group metadata is group-1: first_route and third_route.

[{
  "route_id": "first_route",
  "route_object": {
    "predicate": "...",
  },
  "metadata": { "group": "group-1" }
},
{
  "route_id": "second_route",
  "route_object": {
    "predicate": "...",
  },
  "metadata": { "group": "group-2" }
},
{
  "route_id": "third_route",
  "route_object": {
    "predicate": "...",
  },
  "metadata": { "group": "group-1" }
}]

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 the details of all the routes defined in the gateway. The following table describes the structure of each element (each is a route) of the response:

Path Type Description

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.

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.

Retrieving Information about a Particular Route

To retrieve information about a single route, make a GET request to /actuator/gateway/routes/{id} (for example, /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

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.

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.

Creating and Deleting a Particular Route Definition

To create a route definition, make a POST request to /gateway/routes/{id_route_to_create} with a JSON body that specifies the fields of the route (see Retrieving Information about a Particular Route).

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

Creating multiple Route Definitions

To create multiple route definitions in a single request, make a POST request to /gateway/routes with a JSON body that specifies the fields of the route, including the route id (see Retrieving Information about a Particular Route).

The route definitions will be discarded if any route raises an error during the creation of the routes.

Recap: The List of All endpoints

The following table below summarizes the Spring Cloud Gateway actuator endpoints (note that each endpoint has /actuator/gateway as the base-path):

ID HTTP Method Description

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	Adds a new route to the gateway.
`routes/{id}`	DELETE	Removes an existing route from the gateway.

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

Adds a new route to the gateway.

routes/{id}

DELETE

Removes an existing route from the gateway.