To add a filter and apply it to all routes, you can use spring.cloud.gateway.default-filters. You can combine multiple route predicate factories with logical and statements. By default, it creates a NettyChannel by using the default TrustManagerFactory. The resulting response is similar to the following: The response contains the details of all the routes defined in the gateway. It does not work in a traditional Servlet Container or when built as a WAR. Policy to specify how to modify the response code, body and headers. spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org predicates: - Host: {segment}.myhost.org filters: - AddResponseHeader=foo,bar-{segment} Naming Custom Filters And References In Configuration, 18. Most examples below use the shortcut way. Gunzenhausen (German pronunciation: [ntsnhazn] (); Bavarian: Gunzenhausn) is a town in the Weienburg-Gunzenhausen district, in Bavaria, Germany.It is situated on the river Altmhl, 19 kilometres (12 mi) northwest of Weienburg in Bayern, and 45 kilometres (28 mi) southwest of Nuremberg.Gunzenhausen is a nationally recognized recreation area. If the fallback is called, the request is forwarded to the controller matched by the URI. The following example configures a RemoteAddr route predicate: This route matches if the remote address of the request was, for example, 192.168.1.10. 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: A new, more verbose format has been added to Spring Cloud Gateway. Displays the list of routes defined in the gateway. https://github.com/spring-cloud/spring-cloud-gateway/blob/master/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/SetResponseHeaderGatewayFilterFactory.java, @ryanjbaxter it seems a route filter,can i modify a response header in a global post filter,thanks. return r.host("*.somehost.org").and().path("/somepath") The earlier configuration examples all use a shortcut notation that uses positional arguments rather than named ones. The SaveSession GatewayFilter factory forces a WebSession::save operation before forwarding the call downstream. name can contain a space-separated list of header names. In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. This route matches if the request has a Host header with a value of www.somehost.org or beta.somehost.org or www.anotherhost.org. The default filter is a rewrite path filter with the regex /serviceId/?(?. if. Refresh the page, check Medium 's site status, or find something interesting to read. URI variables may be used in the value and will be expanded at runtime. status codes you want to trip the circuit breaker you can either use an integer with the status code Any otherway is there apart from blocking call? To configure per-route timeouts: The maxSize parameter is the maximum data size allowed by the request header (including key and value). This predicate matches requests that happen before the specified datetime. Then the proxy request is made. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. From the drop down, choose Mapping template and copy and paste the mapping template text below into the Template input box. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency. Feign is a great way to communicate between services and send data like a JSON request body, single header or multiple headers and much more. It takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters. The following example below is invalid: The Redis implementation is based on work done at Stripe. The circuit breaker config object takes a list of The algorithm used is the Token Bucket Algorithm. privacy statement. The gateway can listen for requests on HTTPS by following the usual Spring server configuration. You can configure Spring Cloud Gateway for Kubernetes to run multiple instances in High Availability as you would do with a normal Kubernetes resource. By clicking Sign up for GitHub, you agree to our terms of service and application.yml. If the information is not provided within the next 7 days this issue will be closed. The resulting response is similar to the following: The following table describes the structure of the response: The collection of route predicates. .metadata(RESPONSE_TIMEOUT_ATTR, 200) The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. NOTE: This is not recommended for production. This is the number of tokens the token bucket can hold. Star 14. The following loggers may contain valuable troubleshooting information at the DEBUG and TRACE levels: org.springframework.boot.autoconfigure.web. NEVER_STRIP: The version is not stripped, even if the original request path contains no version. The following example configures a method route predicate: This route matches if the request method was a GET or a POST. This is the rate at which the token bucket is filled. The weights are calculated per group. outcome: The outcome, as classified by HttpStatus.Series. It creates a new URI, based off of the request URI but updated with the URI attribute of the Route object. The gateway maintains a client pool that it uses to route to backends. This filter adds a timer metric named spring.cloud.gateway.requests with the following tags: routeUri: The URI to which the API is routed. The following example configures a between route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver) and before Jan 21, 2017 17:42 Mountain Time (Denver). returned from the route it wraps. For the external controller/handler scenario, headers can be added with exception details. GatewaySampleApplication.java. .build(); You can find more information on doing so in the FallbackHeaders GatewayFilter Factory section. The following listing configures a RewriteLocationResponseHeader GatewayFilter: For example, for a request of POST api.example.com/some/object/name, the Location response header value of object-service.prod.example.net/v2/some/object/id is rewritten as api.example.com/some/object/id. This is the value of the Location header. The following example configures a Spring Cloud CircuitBreaker GatewayFilter: To configure the circuit breaker, see the configuration for the underlying circuit breaker implementation you are using. If max-age is present on the original response, the value is rewritten with the number of seconds set in the timeToLive configuration parameter. This predicate matches cookies that have the given name and whose values match the regular expression. It is defined by an ID, a destination URI, a collection of predicates, and a collection of filters. 1. The XForwarded Headers Filter creates various X-Forwarded-* headers to send to the downstream service. Those values are then available for use by GatewayFilter factories. The following example configures an AddRequestHeader GatewayFilter: This listing adds X-Request-red:blue header to the downstream requests headers for all matching requests. 3,AddResponseHeader GatewayFilter Factory. This is of particular use when using something like Spring Session with a lazy data store, and you need to ensure the session state has been saved before making the forwarded call. The LocalResponseCache runs if its associated property is enabled (spring.cloud.gateway.filter.local-response-cache.enabled) and activates a local cache using Caffeine for all responses that meet the following criteria: The response has one of the following status codes: HTTP 200 (OK), HTTP 206 (Partial Content), or HTTP 301 (Moved Permanently). When combined with setting the reactor.netty log level to DEBUG or TRACE, it enables the logging of information, such as headers and bodies sent and received across the wire. - thaneesh shanand Apr 16, 2018 at 1:05 Spring Cloud Gateway includes many built-in route predicate factories. To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. The After route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). The AddRequestHeader GatewayFilter factory takes a name and value parameter. In the next tutorial of Spring Cloud Gateway Example we will implement these theories and build an application with microservice architecture using Spring Cloud Gateway and demonstrate working examples on web filters to modify request and response body. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). The following table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. connect-timeout must be specified in milliseconds. Each item defines the name and the arguments of a given predicate. The DedupeResponseHeader filter also accepts an optional strategy parameter. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. By default, the gateway defines a single predicate and filter for routes created with a DiscoveryClient. A utility method (called get) is available to make access to these variables easier. The default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName(). The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. Raw. The following examples show how to do so: Custom filters class names should end in GatewayFilterFactory. The following example configures an AddRequestHeadersIfNotPresent GatewayFilter: This listing adds 2 headers X-Request-Color-1:blue and X-Request-Color-2:green to the downstream requests headers for all matching requests. To enable this kind of repository, the following property has to set to true: spring.cloud.gateway.redis-route-definition-repository.enabled If the new named header already exists, its values are augmented with the new values. Closing due to lack of requested feedback. if you intend to modify a JSON response body prior to returning to the client, the above gist will not work (i know because i tried). This uses Java regular expressions for a flexible way to rewrite the request path. The Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). Both offer the same possibilities. 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. to the exchange attributes. Route filters are scoped to a particular route. The following listing configures a StripPrefix GatewayFilter: When a request is made through the gateway to /name/blue/red, the request made to nameservice looks like nameservice/red. That is not a complete working sample, it is just some code. The preceding route matches if the request contained a red query parameter whose value matched the gree. The FallbackHeaders factory lets you add Spring Cloud CircuitBreaker execution exception details in the headers of a request forwarded to a fallbackUri in an external application, as in the following scenario: In this example, after an execution exception occurs while running the circuit breaker, the request is forwarded to the fallback endpoint or handler in an application running on localhost:9994. With MVC, it also supports forwarding to a local handler through the forward() method. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. it is proxying. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. Spring Cloud Gateway comes with one non-default remote address resolver that is based off of the X-Forwarded-For header, XForwardedRemoteAddressResolver. The ReactiveLoadBalancerClientFilter looks for a URI in the exchange attribute named ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. If the response is already cached and a new request is performed with no-cache value in Cache-Control header, it returns a bodiless response with 304 (Not Modified). In order to modify APIcast behavior with custom policies, you must do the following: Add custom policies to APIcast Define a policy chain that configures APIcast policies Add the policy chain to APIcast 4.1. If the input header does not exist, the filter has no impact. The new URI is placed in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute. To enable this for Spring Cloud Gateway add the following dependencies, org.springframework.boot:spring-boot-starter-oauth2-client. Multiple matching segments are allowed. You can use the ModifyRequestBody filter to modify the request body before it is sent downstream by the gateway. This predicate extracts the URI template variables (such as segment, defined in the preceding example) as a map of names and values and places it in the ServerWebExchange.getAttributes() with a key defined in ServerWebExchangeUtils.URI_TEMPLATE_VARIABLES_ATTRIBUTE. The following example configures an AddResponseHeader GatewayFilter that uses a variable: The Spring Cloud CircuitBreaker GatewayFilter factory uses the Spring Cloud CircuitBreaker APIs to wrap Gateway routes in response-timeout must be specified as a java.time.Duration. The following listing configures a RedirectTo GatewayFilter: This will send a status 302 with a Location:https://acme.org header to perform a redirect. You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. *) and the replacement /${remaining}. The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. To enable RouteDefinition metrics, add spring-boot-starter-actuator as a project dependency. The RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the current request is allowed to proceed. If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. (There is also an experimental WebClientWriteResponseFilter that performs the same function but does not require Netty.). The following example shows what this looks like: To enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true. URI variables may be used in the value and are expanded at runtime. Spring Cloud Gateway matches routes as part of the Spring WebFlux HandlerMapping infrastructure. There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. If you want to customize the predicates or filters used by the DiscoveryClient routes, set spring.cloud.gateway.discovery.locator.predicates[x] and spring.cloud.gateway.discovery.locator.filters[y]. The lowercase full name of the secure header needs to be used to disable it.. All of these predicates match on different attributes of the HTTP request. Properties. This is useful when you try to support CORS preflight requests and your route predicate does not evaluate to true because the HTTP method is options. The Spring Cloud Gateway project is built on top of the popular Spring Boot 2 and Project Reactor, so it inherits its main treats: Low resource usage, thanks to its reactive nature Support for all goodies from the Spring Cloud ecosystem (discovery, configuration, etc.) The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. The following listing configures a Retry GatewayFilter: A simplified "shortcut" notation can be added with a single status and method. extracts an access token from the currently authenticated user, The RewritePath GatewayFilter factory takes a path regexp parameter and a replacement parameter. Configure for High Availability. For each factory there is a string representation of the corresponding object (for example, [[emailprotected] configClass = Object]). There is an abstract class called AbstractRoutePredicateFactory which you can extend. How to modify spring cloud gateway response headers, https://github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, https://github.com/spring-cloud/spring-cloud-gateway/blob/master/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/SetResponseHeaderGatewayFilterFactory.java. method: Method name in the service that handles the request. This vulnerability is known as HTTP Response Splitting. The following headers (shown with their default values) are added: Strict-Transport-Security (max-age=631138519), Content-Security-Policy (default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src https:; style-src 'self' https: 'unsafe-inline)'. . It is the name of the header to be removed. Server. To write a custom global filter, you must implement GlobalFilter interface as a bean. How does it work? To enable the Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath. The route configuration allows applying CORS directly to a route as metadata with key cors. Value 3.9. These are basic guides to writing some custom components of the gateway. APIcast standard policies Likewise to the RedisRateLimiter Filter Factory it requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. The HTTP Cache-Control header allows caching (that means it does not have any of the following values: no-store present in the request and no-store or private present in the response). In order to write a Route Predicate you will need to implement RoutePredicateFactory as a bean. Appending multiple headers can be controlled by the following boolean properties (defaults to true): spring.cloud.gateway.x-forwarded.for-append, spring.cloud.gateway.x-forwarded.host-append, spring.cloud.gateway.x-forwarded.port-append, spring.cloud.gateway.x-forwarded.proto-append, spring.cloud.gateway.x-forwarded.prefix-append. For example, given a Gateway that has 1 replica, the following will . This predicates matches the Host header that matches the pattern. essentially skipping the filter. The following example configures a host route predicate: URI template variables (such as {sub}.myhost.org) are supported as well. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. Looking for a place to stay in Gunzenhausen? ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. You signed in with another tab or window. XForwardedRemoteAddressResolver has two static constructor methods, which take different approaches to security: XForwardedRemoteAddressResolver::trustAll returns a RemoteAddressResolver that always takes the first IP address found in the X-Forwarded-For header. The following listing configures a RewritePath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. Spring Cloud Gateway 4.0.3 This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. ServerHttpResponse interface. The mapper is a Function that takes the incoming ResponseEntity and converts it to an outgoing one. Modifying the headers is simple because we can obtain a reference to the HttpHeaders map object: exchange.getRequest () .mutate () .headers (h -> h.setAcceptLanguageAsLocales ( Collections.singletonList (requestLocale))) Copy But, on the other hand, modifying the URI is not a trivial task. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. Retries are performed after a backoff interval of firstBackoff * (factor ^ n), where n is the iteration. If it is not provided, the value of the Host request header is used. This filter also automatically calculates the. also note that the gist doesn't take the decoders into account from upstream like here. For example, when we use Spring Cloud Gateway to implement the gateway, we need to implement a function: parse the JWT stored in the request header, extract the user ID in it, and then write it to the request body. The redis-rate-limiter.requestedTokens property is how many tokens a request costs. Temporary bursts can be allowed by setting burstCapacity higher than replenishRate. See the Spring Cloud Project page for details on setting up your build system with the current Spring Cloud Release Train. If basedOnPreviousValue is true, the backoff is calculated by using prevBackoff * factor. Retrieving Information about a Particular Route, 15.6. This is the number of tokens taken from the bucket for each request and defaults to 1. Spring Cloud has it's own way of defining Feign clients, it's done with Spring MVC annotations. The accepted values are RETAIN_FIRST (default), RETAIN_LAST, and RETAIN_UNIQUE. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. This predicate extracts the URI template variables (such as sub, defined in the preceding example) as a map of names and values and places it in the ServerWebExchange.getAttributes() with a key defined in ServerWebExchangeUtils.URI_TEMPLATE_VARIABLES_ATTRIBUTE. application.yml. Spring Cloud Gateway 1AddRequestHeader GatewayFilter Factory2AddRequestParameter GatewayFilter Factory3AddResponseHeader GatewayFilter Factory4DedupeResponseHeader GatewayFilter Fa. This filter also implements the automatic calculation of the max-age value in the HTTP Cache-Control header. Retrieving the Routes Defined in the Gateway, 15.5. The following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. Cleanliness 4.4. To see the list of all Spring Cloud Gateway related configuration properties, see the appendix. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. For more detailed examples of how to use any of the following filters, take a look at the. To configure Global http timeouts: It may be the integer value 404 or the string representation of the enumeration: NOT_FOUND. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Spring Cloud Zuul is one of the core components of Spring Cloud Netflix subproject. status codes that if returned will cause the circuit breaker to be tripped. The ServerHttpResponse instance is used to . First-class support is provided for sensitive headers (by default, cookie and authorization), which are not passed downstream, and for proxy (x-forwarded-*) headers. The header is added to the response if configured with the following property: The StripPrefix GatewayFilter factory takes one parameter, parts.