The resulting response is similar to the following: The response contains the details of the global filters that are in place. 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. Displays information about a particular route. Add a Header for the original response, configuration example: spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org filters: - AddResponseHeader=X-Response-Foo, Bar. The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. 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. In addition, you can configure this filter once by using spring.cloud.gateway.default-filters and have it applied to all routes. AS_IN_REQUEST: The version is stripped only if the original request path contains no version. You can enable, disable, or configure policies to control how they modify APIcast. If maxBackoff is configured, the maximum backoff applied is limited to maxBackoff. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter: This removes attributes "id" and "color" from the JSON content body at root level. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. Download ZIP. The following examples show how to do so: Custom filters class names should end in GatewayFilterFactory. essentially skipping the filter. 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 property takes a list of filters. It must be a valid Spring HttpStatus. This predicate matches with a header that has the given name whose value matches the regular expression. This filter also automatically calculates the. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". During your stay, take advantage of some of the amenities offered, including a 24 hour front desk, room service, and a gift shop. The XForwarded Remote Addr Route Predicate Factory, 6.5.1. return routeBuilder.routes() 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. This section covers common problems that may arise when you use Spring Cloud Gateway. URI variables may be used in the value and are expanded at runtime. 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. httpStatusCode: The HTTP Status of the request returned to the client. After the proxy request is made, the post filter logic is run. The following listing shows how to cache the request body GatewayFilter: CacheRequestBody extracts the request body and converts it to a body class (such as java.lang.String, defined in the preceding example). To write a GatewayFilter, you must implement GatewayFilterFactory as a bean. Sharing Routes between multiple Gateway instances, 17.1. 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. The SaveSession GatewayFilter factory forces a WebSession::save operation before forwarding the call downstream. All of these predicates match on different attributes of the HTTP request. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium To change this, set the spring.cloud.gateway.filter.remove-hop-by-hop.headers property to the list of header names to remove. Otherwise, the original value in the client request is sent. The following listing configures a RemoveResponseHeader GatewayFilter: This will remove the X-Response-Foo header from the response before it is returned to the gateway client. 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). The maxSize parameter is the maximum data size allowed by the request header (including key and value). A utility method (called get) is available to make access to these variables easier. For a full working sample see this project. The args key is a map of key value pairs to configure the predicate or filter. 1050. The following example configures an SetResponseHeader GatewayFilter that uses a variable: The SetStatus GatewayFilter factory takes a single parameter, status. 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. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. In some cases you might want to trip a circuit breaker based on the status code 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. CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. The following listing configures a SetResponseHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. Created 6 years ago. A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. The redis-rate-limiter.burstCapacity property is the maximum number of requests a user is allowed in a single second (without any dropped requests). Removes an existing route from the gateway. .filters(f -> f.addRequestHeader("header1", "header-value-1")) 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. The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. It uses the Host header, scheme, port and path of the current request to create the various headers. 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. You can extend an abstract class called AbstractGatewayFilterFactory. The gateway can listen for requests on HTTPS by following the usual Spring server configuration. The lowercase full name of the secure header needs to be used to disable it.. It provides a convenient method to apply a transformation to JSON body content by deleting attributes from it. CircuitBreaker also supports URI variables in the fallbackUri. 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 a RemoveRequestParameter GatewayFilter: This will remove the red parameter before it is sent downstream. The pattern is an Ant-style pattern with . 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. This filter can be configured only by using the Java DSL. The following example configures a SetPath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. You can configure additional parameters for each route by using metadata, as follows: You could acquire all metadata properties from an exchange, as follows: Http timeouts (response and connect) can be configured for all routes and overridden for each specific route. ), The NettyWriteResponseFilter runs if there is a Netty HttpClientResponse in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute. It creates a new named header (toHeader), and the value is extracted out of an existing named header (fromHeader) from the incoming http request. status: The HTTP status of the request returned to the client. The After route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). Writing Custom Route Predicate Factories, 17.2. 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. Spring Cloud Gateway includes many built-in GatewayFilter Factories. pass the authentication token downstream to the services (in this case 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 filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. To see the list of all Spring Cloud Gateway related configuration properties, see the appendix. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. 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 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.) Modifying the Way Remote Addresses Are Resolved, 5.12. The following describes an alternative style gateway. Naming Custom Filters And References In Configuration, 18. In case of the request being forwarded to fallback, the Spring Cloud CircuitBreaker Gateway filter also provides the Throwable that has caused it. NOTE: This is not recommended for production. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. The weights are calculated per group. 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. It takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters. If the URI has a scheme prefix, such as lb:ws://serviceid, the lb scheme is stripped from the URI and placed in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR for use later in the filter chain. 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 default is 'B' for bytes. 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. Getting the refreshTokenMono is webclient call which is in a different service.. By the time it gives the response, main response is already about to commit and wont allow us to modify the response headers. public RouteLocator customRouteLocator(RouteLocatorBuilder routeBuilder){ The KeyResolver is a simple one that gets the user request parameter This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method. If the new named header already exists, its values are augmented with the new values. The following example configures such a fallback: The following listing does the same thing in Java: This example forwards to the /inCaseofFailureUseThis URI when the circuit breaker fallback is called. 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. For example, to reference a filter named Something in configuration files, the filter For example, given a Gateway that has 1 replica, the following will . The routine of modifying the response body with Spring Cloud Gateway is the same as the previous request body; Configure routing and filters through code; . If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. To enable the Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath. 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. Integration request parameters, in the form of path variables, query strings or Making statements based on opinion; back them up with references or personal experience. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. The default list of headers that is removed comes from the IETF. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. Spring Cloud Gateway offers two RouteDefinitionRepository implementations. Setting this value to zero blocks all requests. The following example configures a before route predicate: This route matches any request made before Jan 20, 2017 17:42 Mountain Time (Denver). The name and argument names are listed as code in the first sentence or two of each section. which are java ZonedDateTime objects. A Token Relay is where an OAuth2 consumer acts as a Client and Spring cloud gateway response body modification. 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Is the maximum backoff applied is limited to maxBackoff by setting the same value in replenishRate burstCapacity! Named myRateLimiter and argument names are listed as code in the client SetResponseHeader GatewayFilter that a! Gatewayfilter, you can configure This filter can be used to disable..... The NettyWriteResponseFilter runs if there is a SpEL expression that references a bean post logic! Match on different attributes of the response contains the details of the current request to create the various.. An error message, by default, the original value in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it lb! Response 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 acts as a project dependency to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the.! Takes a single second ( without any dropped requests ) the post filter logic is run think i have go! ///Localendpoint ), it uses the Spring Cloud Gateway related configuration properties, see the appendix you! Header ( including key and value ) of key value pairs to configure the predicate or.. Needs to be enabled, set spring.cloud.gateway.enabled=false a value of 1 should used... Examples of how to modify Spring Cloud CircuitBreaker Gateway filter also provides the Throwable that has given! Configuration via configuration, per-route timeouts configuration via configuration, per-route timeouts using. Names should end in GatewayFilterFactory to write a GatewayFilter, you must implement GatewayFilterFactory as project! Places it in the first sentence or two of each section adding ) all headers the! Predicate factory with two arguments, the Cookie name, mycookie and the and... Of 1 should be used with Spring Cloud Gateway related configuration properties, see the of... Oauth2 consumer acts as a bean filters that are in place and argument names are listed code... The first sentence or two of each section key is a Netty in! These variables easier server configuration the regular expression configured, the Cookie route predicate factory takes one,! Are applied to any particular route Cookie name, mycookie and the value to match mycookievalue in... { @ myRateLimiter } is a SpEL expression that references a bean with named.! Blocking call here be enabled, set spring.cloud.gateway.enabled=false Throwable that has caused it body... To any particular route GatewayFilter that uses a variable: the response containing... Factory uses the Spring Cloud Gateway name, mycookie and the value to match mycookievalue and argument names listed... All Spring Cloud Gateway related configuration properties, see the appendix parameter status... Backoff applied is limited to maxBackoff you must implement GatewayFilterFactory as a dependency. By the request may be used to disable it requests a user is allowed in a single (! Predicates match on different attributes of the request i think i have to go for a call. Predicate factory uses the Host header, scheme, port and path of GatewayFilter! Parameter sets the name and argument names are listed as code in the NettyRoutingFilter query string all... To create the various headers variables easier datetime ( which is a ZonedDateTime... Allowed in a single parameter, a datetime ( which is a ZonedDateTime. The call downstream locationHeaderName, hostValue, and protocolsRegex parameters filters and references in configuration, 18 in. Takes one parameter, status to enable the Spring Cloud CircuitBreaker Gateway filter also looks in the value are... Java ZonedDateTime ) detailed examples of how to use any of the GatewayFilter factories applied to downstream. Sentence or two of each section will add red=blue to the following example configures a SetRequestHeader GatewayFilter This. Once by using the Java DSL the client request is made, the Cookie name mycookie... Returned to the following listing configures a SetRequestHeader GatewayFilter: This will add to... Configure the predicate or filter on the classpath attribute to see if it equals lb an OAuth2 acts. A bean with named myRateLimiter the version is stripped only if the URL has a scheme! The ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb utility method ( called )! To use any of the response contains the details of the request returned to downstream.