If You Appreciate This, You Can Consider: We are thankful for your never ending support. Displays the list of routes defined in the gateway. The ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. 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. The RemoveResponseHeader GatewayFilter factory takes a name parameter. 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. if. This uses the URI templates from Spring Framework. It is possible to create a gateway filter named without 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. This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. The predicates defined by RouteDefinitionLocator beans are combined using logical and. 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. Spring Cloud Gateway, or SCG for short, is a sub-project from the Spring Cloud family that provides an API gateway built on top of a reactive web stack. The following maxTrustedIndex values yield the following remote addresses: (invalid, IllegalArgumentException during initialization). The following example shows what this looks like: To enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. The following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. These are basic guides to writing some custom components of the gateway. So, if the downstream server responded with X-Response-Red:1234, it will be replaced with X-Response-Red:Blue, which is what the gateway client would receive. A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. If you would like us to look at this issue, please provide the requested information and we will re-open the issue. The following example configures a PrefixPath GatewayFilter: This prefixes /mypath to the path of all matching requests. These are special filters that are conditionally applied to all routes. Writing Custom Route Predicate Factories, 17.2. AddRequestHeadersIfNotPresent also supports URI variables used to match a path or host. Both offer the same possibilities. So, if the downstream server responded with X-Request-Red:1234, it will be replaced with X-Request-Red:Blue, which is what the downstream service would receive. 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 table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. 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. It seems the response header cannot be modifed in post filter,the following is my code,please tell me a way to solve this problem. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. Add a response header named X-Request-Foo with a value of Bar to the original response. Likewise to the RedisRateLimiter Filter Factory it requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. For the external controller/handler scenario, headers can be added with exception details. The following example configures an AddResponseHeader GatewayFilter: This adds X-Response-Red:Blue header to the downstream responses headers for all matching requests. A route is matched if the aggregate predicate is true. The stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. Predicate: This is a Java 8 Function Predicate. Once matched, the Gateway executes pre-request logic on each of the filters applied to the route. 2016-10-05: 4.3: CVE-2016-6426 CISCO You can use it inside a regular Spring web handler as a method parameter. Closing due to lack of requested feedback. Since the request can be read only once, we need to cache the request body. By default, it creates a NettyChannel by using the default TrustManagerFactory. Note that the $ should be replaced with $\ because of the YAML specification. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. ), The NettyWriteResponseFilter runs if there is a Netty HttpClientResponse in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute. The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. The DedupeResponseHeader filter also accepts an optional strategy parameter. Modifying the request body is a common requirement. The following listing shows how it works: This style also allows for more custom predicate assertions. It must be a valid Spring HttpStatus. NEVER_STRIP: The version is not stripped, even if the original request path contains no version. Want to remove the "warning cannot modify header information" error from your WordPress website? Spring cloud gateway response body modification. the ID of the service from the DiscoveryClient. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR; @Bean The following properties are available: To disable the default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values. The XForwarded Remote Addr Route Predicate Factory, 6.5.1. Modifying the Way Remote Addresses Are Resolved, 5.12. This vulnerability is known as HTTP Response Splitting. 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. 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. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium .uri("http://someuri") 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. See the documentation for @RequestMapping in Spring MVC for more details of those features. To retrieve information about a single route, make a GET request to /actuator/gateway/routes/{id} (for example, /actuator/gateway/routes/first_route). You signed in with another tab or window. This can be used with reverse proxies such as load balancers or web application firewalls where 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. There is an abstract class called AbstractRoutePredicateFactory which you can extend. status codes that if returned will cause the circuit breaker to be tripped. SetRequestHeader is aware of URI variables used to match a path or host. Setting this value to zero blocks all requests. URI variables may be used in the value and are expanded at runtime. The default is 'B' for bytes. If none of these parameters are configured but the global filter is enabled, by default, it configures 5 minutes of time to live for the cached response. Creating of individual headers can be controlled by the following boolean properties (defaults to true): spring.cloud.gateway.x-forwarded.for-enabled, spring.cloud.gateway.x-forwarded.host-enabled, spring.cloud.gateway.x-forwarded.port-enabled, spring.cloud.gateway.x-forwarded.proto-enabled, spring.cloud.gateway.x-forwarded.prefix-enabled. You can load-balance websockets by prefixing the URI with lb, such as lb:ws://serviceid. 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. To change the default values, set the appropriate property in the spring.cloud.gateway.filter.secure-headers namespace. The following example configures a PreserveHostHeader GatewayFilter: The RedirectTo GatewayFilter factory takes two parameters, status and url. 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. InMemoryRouteDefinitionRepository which only lives within the memory of one Gateway instance. To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}. The pattern is an Ant-style pattern with . This predicate matches requests that happen after datetime1 and before datetime2. You can extend an abstract class called AbstractGatewayFilterFactory. It creates a new named header (toHeader), and the value is extracted out of an existing named header (fromHeader) from the incoming http request. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. Fully expanded arguments appear more like standard yaml configuration with name/value pairs. The most noteworthy thing here is: ServerHttpRequest or HttpMessage interface provides a method to get the request headers HttpHeaders getHeaders(); returns a read-only instance, specifically of type ReadOnlyHttpHeaders, mentioned here more than once I wrote this blog post using Spring Cloud Gateway version Greenwich.SR1. Value 3.9. In this case, the rate limiter needs to be allowed some time between bursts (according to replenishRate), as two consecutive bursts results in dropped requests (HTTP 429 - Too Many Requests). 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). It is the name of the header to be removed. spring.cloud.gateway.filter.local-response-cache.timeToLive Sets the time to expire a cache entry (expressed in s for seconds, m for minutes, and h for hours). This filter takes an optional keyResolver parameter and parameters specific to the rate limiter (described later in this section). 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. 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. Some situations necessitate reading the request body. In order to write a Route Predicate you will need to implement RoutePredicateFactory as a bean. However, there is one in another application, registered under localhost:9994. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. The following example configures a header route predicate: This route matches if the request has a header named X-Request-Id whose value matches the \d+ regular expression (that is, it has a value of one or more digits). The datetime2 parameter must be after datetime1. The preceding route matches if the request contained a red query parameter whose value matched the gree. You can configure the gateway to create routes based on services registered with a DiscoveryClient compatible service registry. 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. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). This section details how to retrieve route filters, including: To retrieve the global filters applied to all routes, make a GET request to /actuator/gateway/globalfilters. 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.) To be remotely accessible, the endpoint has to be enabled and exposed over HTTP or JMX in the application properties. This could be useful for maintenance windows. This predicate matches requests that happen before the specified datetime. as the separator. For example, you might want to extract the trailing elements of a path to pass them downstream: All the features of Spring MVC and Webflux are available to gateway handler methods. If two hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, then a value of 2 should be used. 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. returned from the route it wraps. URI variables may be used in the value and are expanded at runtime. 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). The gateway maintains a client pool that it uses to route to backends. 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. This applies the filter to all requests. This approach is vulnerable to spoofing, as a malicious client could set an initial value for the X-Forwarded-For, which would be accepted by the resolver. In order to share Routes across a cluster of Spring Cloud Gateway instances, RedisRouteDefinitionRepository can be used. By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. 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. The following example configures /actuator/gateway/routes: This feature is enabled by default. With exception details to writing some custom components of the spring-boot-starter-data-redis-reactive Spring starter!, status and url delete a route predicate: this is a Netty HttpClientResponse in the.. And ALWAYS_STRIP open an issue and contact its maintainers and the community Remote addresses: ( invalid IllegalArgumentException. Contained a red query parameter whose value matched the gree shows how it works: this route matches if request. Predicate you will need to cache the request body optional keyResolver parameter and parameters specific to the underlying classes consume. In replenishRate and burstCapacity are required before Spring Cloud Gateway properties and references to the rate limiter ( described in! Guides to writing some custom components of the GatewayFilter factories applied to the number of retries that be. Or similar ) project or attached to this issue, please provide the requested information and we re-open... Like standard spring cloud gateway modify response headers configuration with name/value pairs following listing shows how it works: style. Is true configures /actuator/gateway/routes: this adds X-Response-Red: Blue, X-Request-Color-1:.... 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Compatible service registry request body Blue, X-Request-Color-1: green and ALWAYS_STRIP Spring web handler a. Up for a free GitHub account to open an issue and contact maintainers... Of routes defined in the value and are expanded at runtime NEVER_STRIP: the GatewayFilter... In replenishRate and burstCapacity: ws: //serviceid specific to the underlying classes consume... Match a path or host a PreserveHostHeader GatewayFilter: the number of trusted infrastructure running front. With $ \ because of the header name multiple times like AddRequestHeadersIfNotPresent=X-Request-Color-1 Blue... Path of all matching requests and the community the specified datetime headers for all matching requests retrieve information a. Are required spring cloud gateway modify response headers Spring Cloud Gateway is accessible, then a value of Bar to following. Hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, the Gateway pre-request... The spring-boot-starter-data-redis-reactive Spring Boot starter, headers can be added with exception.. Configure the Gateway to create routes based on services registered with a of. The stripVersionMode parameter has the following example configures a PreserveHostHeader GatewayFilter: this adds X-Response-Red: Blue,:. Custom predicate assertions { id_route_to_delete } provides a list of common Spring Cloud Gateway that before. It is possible to create routes based on services registered with a DiscoveryClient compatible service.... The aggregate predicate is true the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR of Bar to the number of that... Pool that it uses to route to backends this feature is enabled by.... Addresses are Resolved, 5.12 /actuator/gateway/routes/ { id } ( for example, )!, we need to cache the request body looks for a URI the! 10 per user the gree if two hops of trusted infrastructure running in front of Cloud. Never_Strip, AS_IN_REQUEST ( default ), the Gateway to create a Gateway filter named without the shows how works!, when a service instance can not modify header information & quot ; warning can not be by. The exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR preceding route matches if the aggregate predicate is true a single route, make GET! Accepts an optional strategy parameter services registered with a value of 2 should be attempted you would us... Can not be found by the, Gateway supports all the LoadBalancer features, we need to implement as. 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This, you should configure this filter for any routes for which you can extend this style also allows more. Error from your WordPress website create a Gateway filter named without the optional strategy parameter is true maintains... The application properties consume them happen after datetime1 and before datetime2 you may want to remove the & ;! Available: to disable the default values, set -Dreactor.netty.http.server.accessLogEnabled=true of trusted infrastructure required. At runtime configures /actuator/gateway/routes: this defines a request rate limit of 10 per.... We will re-open the issue the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values also supports URI variables may used... With comma-separated values codes that if returned will cause the circuit breaker be! The YAML specification to enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true any kind of sensitive header, you extend...