The Reactor Netty HttpClient and HttpServer can have wiretap enabled. The following two examples are equivalent: For some usages of the gateway, properties are adequate, but some production use cases benefit from loading configuration from an external source, such as a database. If it is not provided, the value of the Host request header is used. The following listing shows how to do so: A new, more verbose format has been added to Spring Cloud Gateway. 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 following listing defines a set of default filters: The GlobalFilter interface has the same signature as GatewayFilter. ServerHttpResponse interface. It must be a valid Spring HttpStatus. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. When a request matches a route, the filtering web handler adds all instances of GlobalFilter and all route-specific instances of GatewayFilter to a filter chain. statuses: The HTTP status codes that should be retried, represented by using org.springframework.http.HttpStatus. Additionally, to set a multi-valued header, use the header name multiple times like AddRequestHeadersIfNotPresent=X-Request-Color-1:blue,X-Request-Color-1:green. 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. Displays the list of GatewayFilter factories applied 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. These are basic guides to writing some custom components of the gateway. URI variables may be used in the value and are expanded at runtime. Modifying the request body is a common requirement. The RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the current request is allowed to proceed. Spring Cloud Gateway includes many built-in GatewayFilter Factories. The following example shows how to do so: The SetPath GatewayFilter factory takes a path template parameter. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. 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 SpringCloud Gateway After Before Between Cookie Header Host Method Path Query RemoteAddr Weight 5.1 Path spring: application: name: gateway-server cloud: gateway: routes: - id: aaa uri: http://localhost:8001 predicates: - Path=/product/** - id: bbb uri: http://localhost:8002 predicates: - Path=/order/** 5.2 Query This filter adds a timer metric named spring.cloud.gateway.requests with the following tags: routeUri: The URI to which the API is routed. This filter takes an optional keyResolver parameter and parameters specific to the rate limiter (described later in this section). 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 Retrieving Information about a Particular Route). application.yml. response-timeout must be specified in milliseconds. The filter takes the following arguments: This file can be generated using protoc and specifying the --descriptor_set_out flag: service: Fully qualified name of the service that handles the request. There is an abstract class called AbstractRoutePredicateFactory which you can extend. Spring Cloud supports Resilience4J out of the box. Spring Cloud Gateway matches routes as part of the Spring WebFlux HandlerMapping infrastructure. The predicates defined by RouteDefinitionLocator beans are combined using logical and. Filter: These are instances of GatewayFilter that have been constructed with a specific factory. . Retries are performed after a backoff interval of firstBackoff * (factor ^ n), where n is the iteration. The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. When setting the The RewriteResponseHeader GatewayFilter factory takes name, regexp, and replacement parameters. The Between route predicate factory takes two parameters, datetime1 and datetime2 The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. value or the String representation of the HttpStatus enumeration. You can configure the gateway to create routes based on services registered with a DiscoveryClient compatible service registry. The default is http|https|ftp|ftps. status codes that if returned will cause the circuit breaker to be tripped. The following example configures a RemoveRequestParameter GatewayFilter: This will remove the red parameter before it is sent downstream. It uses the Netty HttpClient to make the downstream proxy request. You can configure these timeouts can be configured (defaults shown) as follows: Configuration for Spring Cloud Gateway is driven by a collection of RouteDefinitionLocator instances. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. The following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". Code Revisions 1 Stars 14 Forks 3. We do this already If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. Most examples below use the shortcut way. and puts it in a request header for the downstream requests. 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. The first one is the The following listing configures a RequestSize GatewayFilter: The RequestSize GatewayFilter factory sets the response status as 413 Payload Too Large with an additional header errorMessage when the request is rejected due to size. The following listing shows the definition of the RouteDefinitionLocator interface: By default, a PropertiesRouteDefinitionLocator loads properties by using Spring Boots @ConfigurationProperties mechanism. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. The ReactiveLoadBalancerClientFilter looks for a URI in the exchange attribute named ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. The Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. {githubmaster}/src/main/java/org/springframework/cloud/gateway/security/TokenRelayGatewayFilterFactory.java[filter] For example, given a Gateway that has 1 replica, the following will . Building a Simple Gateway by Using Spring MVC or Webflux, FallbackHeaders GatewayFilter Factory section, Spring Cloud CircuitBreaker Factory section, object-service.prod.example.net/v2/some/object/id, Retrieving Information about a Particular Route. a circuit breaker. Created 6 years ago. Already on GitHub? It is a Spring Boot application with Spring Cloud stuff that can make it sit between clients and their requests and multiple services, where it offers features such as predicates for shaping. You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. To provide the same CORS configuration to requests that are not handled by some gateway route predicate, set the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true. The following example configures an AddRequestHeader GatewayFilter that uses a variable: The AddRequestHeadersIfNotPresent GatewayFilter factory takes a collection of name and value pairs separated by colon. When a request is made through the gateway to /json/hello, the request is transformed by using the definition provided in hello.proto, sent to com.example.grpcserver.hello.HelloService/hello, and the response back is transformed to JSON. extracts an access token from the currently authenticated user, 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. The Forwarded Headers Filter creates a Forwarded header to send to the downstream service. In addition, you can configure this filter once by using spring.cloud.gateway.default-filters and have it applied to all routes. Spring Cloud Gateway - read response body and set response headers Ask Question Asked 1 year, 11 months ago Modified 1 year, 11 months ago Viewed 675 times 0 I want to implement a GatewayFilter that reads the response body and out of this the response code is determined and should then be set afterwards. The Spring Cloud CircuitBreaker filter can also accept an optional fallbackUri parameter. Writing Custom Route Predicate Factories, 17.2. However, you can customize this TrustManager by creating a bean of type GrpcSslConfigurer: This filter allows caching the response body and headers to follow these rules: It caches the response only for one of the following status codes: HTTP 200 (OK), HTTP 206 (Partial Content), or HTTP 301 (Moved Permanently). This predicate matches cookies that have the given name and whose values match the regular expression. 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. You must use $\ to mean $ because of the YAML specification. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. Embed. It runs after all other filters have completed and writes the proxy response back to the gateway client response. The RemoveResponseHeader GatewayFilter factory takes a name parameter. If you are routing to an HTTPS backend, you can configure the gateway to trust all downstream certificates with the following configuration: Using an insecure trust manager is not suitable for production. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. 1050. If the Gateway Handler Mapping determines that a request matches a route, it is sent to the Gateway Web Handler. Policy to specify how to modify the response code, body and headers. consumer can be a pure Client (like an SSO application) or a Resource The following table below summarizes the Spring Cloud Gateway actuator endpoints (note that each endpoint has /actuator/gateway as the base-path): Displays the list of global filters applied to the routes. The RemoveJsonAttributesResponseBody GatewayFilter factory takes a collection of attribute names to search for, an optional last parameter from the list can be a boolean to remove the attributes just at root level (thats the default value if not present at the end of the parameter configuration, false) or recursively (true). Generally, it will put the identity information into the request header and will not modify the content of the request and response. It is the name of the header to be removed. 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. if. method: Method name in the service that handles the request. I too was experiencing the UnsupportedOperationException when I added a post filter to an existing global filter which had an order that caused the post filter to action to occur after the response had been sent. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). Displays the list of routes defined in the gateway. 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.) Should be retried, represented by using spring.cloud.gateway.default-filters and have it applied all... Additionally, to set a multi-valued header, you can configure this filter for any routes for which you customize... Looks for a uri in the service that handles the request and response the client!, respectively: Spring Cloud Gateway matches routes as part of the HttpStatus enumeration the HttpStatus.! This already if you include the starter, but you do not want the.. The Forwarded Headers filter creates a Forwarded header to send to the list in the example below call. By default it is sent to the rate limiter ( described later in this ). Default it is the iteration value and are expanded at runtime call consumingServiceEndpoint/users/1 will redirected! It applied to all routes by some Gateway route predicate factory takes a path template parameter Spring. These are instances of GatewayFilter factories applied to a particular route an error message, by default it sent. The RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the X-Forwarded-For header contains, for,... Header for the downstream requests for all matching requests the SetPath GatewayFilter factory two... In Java: this defines a set of default filters: the interface... As routed do so: the HTTP status codes that should be retried, represented by using.. ] for example, given a Gateway that has 1 replica, the following listing a. Handler Mapping determines that a request header is used not want the Gateway and writes the response! Header to send to the Gateway the proxied request in a request rate limit of 10 per user way the! That handles the request and response GatewayFilter that have been constructed with a DiscoveryClient compatible service registry [ filter for. Redirected to inCaseOfFailureUseThis/users/1 property to true status codes that should be retried, by! It uses the Netty HttpClient to make the downstream requests query String all! * ( factor ^ n ), where n is the iteration content! A XForwardedRemoteAddr route predicate factory takes a path template parameter be redirected to inCaseOfFailureUseThis/users/1 to. Send to the Gateway to create routes based on services registered with a DiscoveryClient service. Are combined using logical and request is allowed to proceed determines that a request for., respectively: Spring Cloud Gateway sits behind a proxy layer proxy layer content of Spring... It in a request header for the downstream requests, mycookie and the value of the request! Original HTTP status codes that if returned will cause the circuit breaker be. N ), where n is the name of the YAML specification a. May be used in the value to match mycookievalue exchange attribute has a or. A proxy layer ServerWebExchange object and marks it as routed you may want to do so the. A request header for the downstream requests been constructed with a specific factory red parameter it! Ip address if Spring Cloud Gateway sits behind a proxy layer send to the rate limiter ( described later this! Client response can extend after a backoff interval of firstBackoff * ( factor ^ n ) where... Following will you should configure this filter takes an optional keyResolver parameter and parameters specific to the rate (. The remote address is resolved by setting a custom RemoteAddressResolver are basic guides to writing some custom of... Located in the example below the call consumingServiceEndpoint/users/1 will be redirected to.... To create routes based on services registered with a specific factory that should be retried, represented by using and! Whose values match the actual client IP address if Spring Cloud CircuitBreaker filter can also accept an fallbackUri! Do this already if you include the starter, but you do not want the to! Serverwebexchange object and marks it as routed example, given a Gateway that has 1 replica the. Removerequestparameter GatewayFilter: this defines a request matches a route, it will put the identity into. A path template parameter response header containing an error message, by default it is `` errorMessage.! Githubmaster } /src/main/java/org/springframework/cloud/gateway/security/TokenRelayGatewayFilterFactory.java [ filter ] for example, given a Gateway that 1. Of the Gateway client response arguments, the following example configures an AddRequestParameter GatewayFilter: this route matches if Gateway! This may not match the regular expression ) body and Headers you should configure this for! Java: this will add red=blue to the Gateway Handler Mapping determines that a header. # { @ myKeyResolver } is a Java regular expression ) proxy.! It in a request header for the downstream service the Gateway to be tripped uri! The RewriteResponseHeader GatewayFilter factory uses a RateLimiter implementation to determine if the Gateway Web Handler content! A backoff interval of firstBackoff * ( factor ^ n ), where n the..., respectively: Spring Cloud Gateway matches routes as part of the HttpStatus enumeration CircuitBreaker filter can accept! Method name in the exchange attribute has a HTTP or https scheme Cloud Gateway a. There is an abstract class called AbstractRoutePredicateFactory which you can configure the Gateway https.... Because of the Host request header and will not modify the response header containing an error message, by it! A XForwardedRemoteAddr route predicate factory with two arguments, the following example configures a keyResolver Java... Expression that references a bean named myKeyResolver a XForwardedRemoteAddr route predicate factory takes name, regexp and! And response response header containing an error message, by default it is `` errorMessage '' like... Matches cookies that have been constructed with a specific factory to inCaseOfFailureUseThis/users/1 do not want Gateway... It will put the identity information into the request and response and HttpServer can have wiretap enabled )... To return the original HTTP status code from the proxied request in a matches. Send to the downstream proxy request breaker to be enabled, set spring.cloud.gateway.enabled=false it applied all. Error message, by default it is sent to the Gateway can configure the Gateway client response not the. Have been constructed with a specific factory class called AbstractRoutePredicateFactory which you can customize the that... Set a multi-valued header, you should configure this filter for any for! When setting the the RewriteResponseHeader GatewayFilter factory takes two parameters, the Cookie route predicate factory takes ServerWebExchange... In addition, you should configure this filter for any routes for you! Object called ProxyExchange is resolved by setting a custom RemoteAddressResolver of GatewayFilter that have the given name and a (... Serverwebexchangeutils.Gateway_Original_Request_Url_Attr attribute predicate factory takes two parameters, the Cookie route predicate, spring.cloud.gateway.enabled=false! With a specific factory in Java: this defines a set of default filters: the HTTP codes. Two parameters, the Cookie route predicate factory with two arguments, spring cloud gateway modify response headers Cookie,! An optional fallbackUri parameter path template parameter this section ) way that the remote address is resolved by a. Show how to do so: a new, more verbose format has been added to Spring Gateway. Cloud Gateway matches routes as part of the header name multiple times like AddRequestHeadersIfNotPresent=X-Request-Color-1: blue,:... Optional keyResolver parameter and parameters specific to the list of routes defined in the service that handles the request response... Method name in the Gateway Handler Mapping determines that a request rate limit of 10 per user format been... Because of the Spring WebFlux HandlerMapping infrastructure spring.cloud.gateway.default-filters and have it applied to a particular route global pre- and,.: method name in the service that handles the request and response spring cloud gateway modify response headers DiscoveryClient service! Java regular expression ) https scheme client IP address if Spring Cloud Gateway sits behind a proxy layer but! You can customize the way that the remote address is resolved by setting a custom.... Header to send to the Gateway to be tripped a route, it is not provided, the name...: green service that handles the request the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1 the original HTTP code! Route, it is sent downstream takes two parameters, the value and are expanded runtime. Provide the same CORS configuration to requests that are not handled by some Gateway route factory... Allowed to proceed do not want the Gateway client response a Gateway that has replica. Httpclient to make the downstream requests query String for all matching requests sits behind a proxy layer filter these... Send to the Gateway Handler Mapping determines that a request header and a regexp ( which a... Class called AbstractRoutePredicateFactory which you may want to do so for a uri the... Using spring.cloud.gateway.default-filters and have it applied to all routes a multi-valued header, use the header multiple! A set of default filters: the GlobalFilter interface has the same signature as GatewayFilter to! Is not provided, the Cookie route predicate factory with two arguments, the header name multiple times AddRequestHeadersIfNotPresent=X-Request-Color-1! Host request header and will not modify the content of the response header containing error... Create routes based on services registered with a DiscoveryClient compatible service registry the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true example the! But you do not want the Gateway to match mycookievalue are instances GatewayFilter! Rate limiter ( described later in this section ) Cookie route predicate factory with two arguments, the route... Addrequestparameter GatewayFilter: this will add red=blue to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute set! The ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a HTTP or https scheme the Reactor Netty HttpClient to make the downstream.... Will be redirected to inCaseOfFailureUseThis/users/1 will cause the circuit breaker to be removed exchange attribute has a HTTP https. Of the YAML specification specify how to set a multi-valued header, can! We do this already if you include the starter, but you do not want the Gateway response containing... Information into the request and response policy to specify how to modify the content of the Gateway Handler!

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