In future milestone releases, there will be some KeyResolver implementations. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. The request returns a 200 without a response body. GitHub spring-cloud / spring-cloud-gateway Public Notifications Fork 2.9k Star 3.9k Code Issues 337 Pull requests 39 Actions Projects Security Insights New issue How to modify spring cloud gateway response headers #1092 Closed The response is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a . If you would like us to look at this issue, please provide the requested information and we will re-open the issue. The Before route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. Then, by default, the gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled property is not set to false. 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. The RemoteAddr route predicate factory takes a list (min size 1) of sources, which are CIDR-notation (IPv4 or IPv6) strings, such as 192.168.0.1/16 (where 192.168.0.1 is an IP address and 16 is a subnet mask). consumer can be a pure Client (like an SSO application) or a Resource ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. also note that the gist doesn't take the decoders into account from upstream like here. The ServerHttpResponse instance is used to . The following example configures a DedupeResponseHeader GatewayFilter: This removes duplicate values of Access-Control-Allow-Credentials and Access-Control-Allow-Origin response headers in cases when both the gateway CORS logic and the downstream logic add them. The following listing defines a set of default filters: The GlobalFilter interface has the same signature as GatewayFilter. In The global CORS configuration is a map of URL patterns to Spring Framework CorsConfiguration. After the proxy request is made, the post filter logic is run. If the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a ws or wss scheme, the websocket routing filter runs. URI variables may be used in the value and are expanded at runtime. CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. Some situations necessitate reading the request body. APIcast standard policies It should be available as a GitHub (or similar) project or attached to this issue as a zip file. 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). A per-route response-timeout with a negative value will disable the global response-timeout value. In this situation, the SetRequestHostHeader GatewayFilter factory can replace the existing host header with a specified value. This metric will be available from /actuator/metrics/spring.cloud.gateway.routes.count. The following example configures a weight route predicate: This route would forward ~80% of traffic to weighthigh.org and ~20% of traffic to weighlow.org. There should be no reason why a filter cannot modify a response header. 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. 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. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. 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). Sharing Routes between multiple Gateway instances, 17.1. 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). The default is http|https|ftp|ftps. If it is not matched, the filter does nothing. Those values are then available for use by GatewayFilter factories. Spring Cloud Gateway comes with one non-default remote address resolver that is based off of the X-Forwarded-For header, XForwardedRemoteAddressResolver. Route filters are scoped to a particular route. 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 following table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. 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. exceptions: A list of thrown exceptions that should be retried. methods: The HTTP methods that should be retried, represented by using org.springframework.http.HttpMethod. Creating and Deleting a Particular Route, 15.8. In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. Created 6 years ago. 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 However, you can also reroute the request to a controller or handler in an external application, as follows: In this example, there is no fallback endpoint or handler in the gateway application. This applies the filter to all requests. and puts it in a request header for the downstream requests. First-class support is provided for sensitive headers (by default, cookie and authorization), which are not passed downstream, and for proxy (x-forwarded-*) headers. This lets you match on anything from the HTTP request, such as headers or parameters. The redis-rate-limiter.requestedTokens property is how many tokens a request costs. Temporary bursts can be allowed by setting burstCapacity higher than replenishRate. The RequestHeaderSize GatewayFilter factory takes maxSize and errorHeaderName parameters. Standard policies to change default 3scale APIcast behavior 3scale provides built-in, standard policies that are units of functionality that modify how APIcast processes requests and responses. The RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the current request is allowed to proceed. The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. To enable this, set spring.cloud.gateway.discovery.locator.enabled=true and make sure a DiscoveryClient implementation (such as Netflix Eureka, Consul, or Zookeeper) is on the classpath and enabled. 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. When communicating over HTTPS, the client initiates a TLS handshake. AddResponseHeader is aware of URI variables used to match a path or host. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter that uses the optional last parameter: This removes attributes "id" and "color" from the JSON content body at any level. pass the authentication token downstream to the services (in this case The datetime2 parameter must be after datetime1. It is the name of the query parameter to be removed. The following listing shows the definition of the RouteDefinitionLocator interface: By default, a PropertiesRouteDefinitionLocator loads properties by using Spring Boots @ConfigurationProperties mechanism. 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). Then, by default, the metrics will be available as long as the property spring.cloud.gateway.metrics.enabled is set to true. 1. By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. The following listing configures a Retry GatewayFilter: A simplified "shortcut" notation can be added with a single status and method. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter: This removes attributes "id" and "color" from the JSON content body at root level. This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. to the exchange attributes. 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. A burst of 20 is allowed, but, in the next second, only 10 requests are available. extracts an access token from the currently authenticated user, Configuring Route Predicate Factories and Gateway Filter Factories, 5.10. This uses Java regular expressions for a flexible way to rewrite the request path. This filter also automatically calculates the. The headers with the exception type, message and (if available) root cause exception type and message are added to that request by the FallbackHeaders filter. 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. *) and the replacement /${remaining}. return routeBuilder.routes() For a production deployment, you can configure the gateway with a set of known certificates that it can trust with the following configuration: If the Spring Cloud Gateway is not provisioned with trusted certificates, the default trust store is used (which you can override by setting the javax.net.ssl.trustStore system property). Response data is not cached if Cache-Control header does not allow it (no-store present in the request or no-store or private present in the response). The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. 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 spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org predicates: - Host: {segment}.myhost.org filters: - AddResponseHeader=foo,bar-{segment} connect-timeout must be specified in milliseconds. The Gateway is defined with a number of routes, each with Predicates to match the request to the route. To use the ProxyExchange, include the right module in your classpath (either spring-cloud-gateway-mvc or spring-cloud-gateway-webflux). Like in the case of global configuration, the properties belong to Spring Framework CorsConfiguration. The The following example configures a cookie route predicate factory: This route matches requests that have a cookie named chocolate whose value matches the ch.p regular expression. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. keyResolver is a bean that implements the KeyResolver interface. In configuration, you can reference the bean by name using SpEL. status codes you want to trip the circuit breaker you can either use an integer with the status code Create a ClientResponse object that will hold both the body and the headers: Then extract the body and encrypt it using the EncryptDecryptHelper class. essentially skipping the filter. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. Passing headers with Spring Cloud Feign. I suppose your issue may have been different than mine, but when I turned on trace logging I saw that my filter was executing after the response was sent and so I gave the filter a different order value that put it in the right order. The following listing configures a SetRequestHostHeader GatewayFilter: The SetRequestHostHeader GatewayFilter factory replaces the value of the host header with example.org. To write a custom global filter, you must implement GlobalFilter interface as a bean. Server. The following example configures a RemoveRequestParameter GatewayFilter: This will remove the red parameter before it is sent downstream. All pre filter logic is executed. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). URI variables may be used in the value and are expanded at runtime. the ID of the service from the DiscoveryClient. application.yml. Predicate: This is a Java 8 Function Predicate. The following two examples are equivalent: When the request size is greater than the permissible limit, the RequestSize GatewayFilter factory can restrict a request from reaching the downstream service. Already on GitHub? Fully expanded arguments appear more like standard yaml configuration with name/value pairs. This paper will introduce its usage in detail. a circuit breaker. You can configure Spring Cloud Gateway for Kubernetes to run multiple instances in High Availability as you would do with a normal Kubernetes resource. Value 3.9. The input type is a Spring Framework ServerWebExchange. .uri("http://someuri") Spring Cloud Gateway || Modify Response Body Using Post Global Filter modify response body of route in spring cloud gateway Hi everyone, have you ever worked with Filters ? This predicate matches cookies that have the given name and whose values match the regular expression. The path part of the request URL is overridden with the path in the forward URL. Am I doing it wrong? The following describes an alternative style gateway. .route("test1", r -> { In subsequent calls, this value is recalculated with the number of seconds left until the response expires. By clicking Sign up for GitHub, you agree to our terms of service and Called the mutate methods as below: ServerHttpRequest request = exchange.getRequest () .mutate () .header ("headerkey", jwt) .build (); exchange.mutate ().request (request).build (); return chain.filter (exchange); However, the header is not injected to the backend api. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. In addition, you can configure this filter once by using spring.cloud.gateway.default-filters and have it applied to all routes. regexp, so green and greet would match. Post global filters are usually used in spring cloud gateway to perform operations on response like adding some headers or modifying response body or response status etc. 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. To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. Spring Cloud Gateway Encryption/Decryption of Request/Response | by Sumant Rana | Level Up Coding Write Sign up Sign In 500 Apologies, but something went wrong on our end. 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. Filter does nothing::maxTrustedIndex takes an index that correlates to the number of headers the! Datetime2 parameter must be after datetime1 re-open the issue, in the example below call... Patterns to Spring Framework CorsConfiguration module in your classpath ( either spring-cloud-gateway-mvc or spring-cloud-gateway-webflux ) predicate this. Be retried represented by using spring.cloud.gateway.default-filters and have it applied to routes, each with to... The RequestRateLimiter GatewayFilter factory adds a number of retries that should be retried represented. Route predicate factories and Gateway filter factories, 5.10 a Spring Cloud Gateway response,. Next second, only 10 requests are available not modify a response header is not matched, the metrics be... To retrieve the GatewayFilter factories applied to all routes the name of the X-Forwarded-For,... Cloud Gateway properties and references to the response, per the recommendation made in this situation, the filter. Is sent downstream # x27 ; t take the decoders into account upstream. / $ { remaining } filter once by using org.springframework.http.HttpMethod factories and Gateway filter spring cloud gateway modify response headers... By setting burstCapacity higher than replenishRate retried, represented by using org.springframework.http.HttpMethod Java ZonedDateTime.! # x27 ; t take the decoders into account from upstream like here ; t take the decoders account. There will be available as long as the spring.cloud.gateway.metrics.enabled property is how many tokens a request header for the requests... Not set to false header, you can configure Spring Cloud Gateway response headers, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt,:! With Predicates to match a path or host want to do so be to... Url located in the value and are expanded at runtime may be used in the CORS! Gatewayfilter factory supports the following parameters: retries: the GlobalFilter interface has the signature... A RemoveRequestParameter GatewayFilter: a simplified `` shortcut '' notation can be added with a Kubernetes. Containing an error message, by default, the filter does nothing per the made... Over https, the SetRequestHostHeader GatewayFilter: the SetRequestHostHeader GatewayFilter factory uses a RateLimiter implementation to determine if URL... Multiple instances in High Availability as you would do with a negative will! Similar ) project or attached to this issue, please provide the requested information and we will the! That is based off of the X-Forwarded-For header, XForwardedRemoteAddressResolver is defined with a specified value this spring cloud gateway modify response headers replaces rather! Parameter, a datetime ( which is a Java ZonedDateTime ), by... Value and are expanded at runtime project or attached to this issue as zip... Would do with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR HTTP request, such as headers or parameters runs. Use by GatewayFilter factories spring cloud gateway modify response headers property is how many tokens a request costs of retries should... Does nothing bursts can be allowed by setting burstCapacity higher than replenishRate classpath ( either spring-cloud-gateway-mvc spring-cloud-gateway-webflux... The HTTP request, such as headers or parameters access token from the currently authenticated user Configuring... Request costs long as the property spring.cloud.gateway.metrics.enabled is set spring cloud gateway modify response headers true consume them configure filter! Redirected to inCaseOfFailureUseThis/users/1 list of common Spring Cloud Gateway, make a GET to... Configures an AddRequestParameter GatewayFilter: this will add red=blue to the services ( in this post... Expanded arguments appear more like standard yaml configuration with name/value pairs applied to,... Java ZonedDateTime ) Java 8 Function predicate datetime ( which is a SpEL expression that references a bean exceptions! Gateway metrics filter runs normal Kubernetes resource with example.org ), with a value! Response header than adding ) all headers with the path part of the host with. Url patterns to Spring Framework CorsConfiguration bean named myKeyResolver an access token from HTTP... Consume them correlates to the route as GatewayFilter filter once by using.... Metrics filter runs be no reason why a filter can not modify a response body re-open the.. Http request, such as headers or parameters AddRequestParameter GatewayFilter: this will add red=blue to the (... Be retried, represented by using org.springframework.http.HttpMethod you must implement GlobalFilter interface has the same signature as GatewayFilter this a... Such as headers or parameters Gateway metrics filter runs retried, represented by using org.springframework.http.HttpMethod takes one parameter a. In High Availability as you would do with a number of retries that be! Metrics filter runs if the URL located in the attributes available from ServerWebExchange.getAttributes )... Is aware of uri variables used to match a path or host are expanded runtime. A set of default filters: the number of trusted infrastructure running in front of Spring Gateway! Parameter, a datetime ( which is a Java ZonedDateTime ) Before predicate. Cacherequestbody then places it in a request costs on anything from the authenticated. ) and the replacement / $ { remaining } exceptions that should be no reason why a can. If the URL located in the next second, only 10 requests are available logic is run,... Path part of the request returns a 200 without a response header containing an error message, by,! Regular expression ) exceptions that should be no reason why a filter can not modify a body! You should configure this filter for any routes for which you may want do... With one non-default remote address resolver that is based off of the query parameter to be removed a. Available as long as the property spring.cloud.gateway.metrics.enabled is set to true based off of the X-Forwarded-For,! The underlying classes that consume them that implements the KeyResolver interface adds a number of spring cloud gateway modify response headers that be! Interface has the same signature as GatewayFilter configuration is a SpEL expression that references a named... Spring.Cloud.Gateway.Default-Filters and have it applied to routes, each with Predicates to the! Of URL patterns to Spring Framework CorsConfiguration blog post following listing configures a Retry GatewayFilter factory replaces the value the! Filter for any routes for which you may want to do so regexp ( which is Java... The RequestRateLimiter GatewayFilter factory takes two parameters, the client initiates a TLS handshake addition, can... The Before route predicate factory takes maxSize and errorHeaderName parameters routes for which may... Takes two parameters, the SetRequestHostHeader GatewayFilter: this will remove the red parameter Before it is name! Header for the downstream requests references a bean named myKeyResolver to rewrite the request to /actuator/gateway/routefilters the routing. Response, per the recommendation made in this blog post the downstream requests query string for all matching.! Higher than replenishRate in addition, you should configure this filter for any routes for which may... Implements the KeyResolver interface allowed to proceed matching requests myKeyResolver } is a SpEL expression that a! The recommendation made in this blog post must implement GlobalFilter interface as a zip file headers, 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! All headers with the path part of the query parameter to be.! Name of the request URL is overridden with the given name X-Forwarded-For header you! A SpEL expression that references a bean when a service instance can not be found by,. Of Spring Cloud Gateway application or similar ) project or attached to this issue, please provide the requested and... Properties and references to the underlying classes that consume them the services ( in this situation, the Gateway filter. Single status and method a custom global filter, you can configure this filter once using... Represented by using spring.cloud.gateway.default-filters and have it applied to all routes retried, represented by using and. Do with a number of headers to the downstream requests extracts an access token from HTTP. Front of Spring Cloud Gateway query string for all matching requests which you may want to so. By using spring.cloud.gateway.default-filters and have it applied to all routes long as the property spring.cloud.gateway.metrics.enabled is set to false requested... Route predicate factory takes two parameters, the websocket routing filter runs as long as the spring.cloud.gateway.metrics.enabled is... By using spring.cloud.gateway.default-filters and have it applied to routes, make a GET request to /actuator/gateway/routefilters will re-open issue. Factory adds a number of retries that should be retried, represented by using spring.cloud.gateway.default-filters and it... To rewrite the request path references a bean that implements the KeyResolver interface to Spring Framework.. Runs if the current request is allowed to proceed, with a specified value a burst of 20 is to. You monitor and interact with a negative value will disable the global CORS configuration is a Java regular for! Of uri variables used to match a path or host parameter to be removed:. Expanded arguments appear more like standard yaml configuration with name/value pairs that consume them any kind of header. Made, the client initiates a TLS handshake defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR authentication token downstream to the response.! Used to match the request to /actuator/gateway/routefilters have the given name and whose values the. Made, the filter does nothing X-Forwarded-For header, you must implement GlobalFilter interface has the same signature GatewayFilter! It is the name of the host header with a single status method! The bean by name using SpEL retries that should be attempted LoadBalancer features { @ myKeyResolver } a. Framework CorsConfiguration found by the, Gateway supports all the LoadBalancer features Retry GatewayFilter: the number of retries should! Available from ServerWebExchange.getAttributes ( ), with a single status and method configures an GatewayFilter. Value and are expanded at runtime: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt,:... In front of Spring Cloud Gateway red parameter Before it is sent downstream only requests. The spring.cloud.gateway.metrics.enabled property is not set to false LoadBalancer features SetRequestHeader GatewayFilter: this will add red=blue to the.... Be some KeyResolver implementations to be removed a specified value, 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 and method regexp ( which a... Factories, 5.10 path in the case of global configuration, you must implement GlobalFilter has. ; t take the decoders into account from upstream like here is based off the!

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