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. 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. You must use $\ to mean $ because of the YAML specification. 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. It runs after all other filters have completed and writes the proxy response back to the gateway client response. or check if an exchange has already been routed. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Naming Custom Filters And References In Configuration, 18. The following listing shows the definition of the RouteDefinitionLocator interface: By default, a PropertiesRouteDefinitionLocator loads properties by using Spring Boots @ConfigurationProperties mechanism. Modifying the Way Remote Addresses Are Resolved, 5.12. httpMethod: The HTTP method used for the request. URI variables may be used in the value and are expanded at runtime. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. Code Revisions 1 Stars 14 Forks 3. 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. value or the String representation of the HttpStatus enumeration. The Gateway is defined with a number of routes, each with Predicates to match the request to the route. 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). The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. pass the authentication token downstream to the services (in this case Displays the list of routes defined in the gateway. 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. You can configure the gateway to create routes based on services registered with a DiscoveryClient compatible service registry. It requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. AddRequestHeadersIfNotPresent also supports URI variables used to match a path or host. If the information is not provided within the next 7 days this issue will be closed. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. The RemoveRequestHeader GatewayFilter factory takes a name parameter. The Method Route Predicate Factory takes a methods argument which is one or more parameters: the HTTP methods to match. These are special filters that are conditionally applied to all routes. 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. 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. 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. 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. As a result, you can inject request headers and query parameters, for instance, and you can constrain the incoming requests with declarations in the mapping annotation. The following listing configures a RequestHeaderSize GatewayFilter: This will send a status 431 if size of any request header is greater than 1000 Bytes. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. If max-age is present on the original response, the value is rewritten with the number of seconds set in the timeToLive configuration parameter. Spring Cloud has it's own way of defining Feign clients, it's done with Spring MVC annotations. Route: The basic building block of the gateway. This predicate extracts the URI template variables (such as sub, defined in the preceding example) as a map of names and values and places it in the ServerWebExchange.getAttributes() with a key defined in ServerWebExchangeUtils.URI_TEMPLATE_VARIABLES_ATTRIBUTE. It takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters. The RemoteAddr Route Predicate Factory, 5.10.1. Closing due to lack of requested feedback. 1. The AddRequestHeader GatewayFilter factory takes a name and value parameter. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. The path part of the request URL is overridden with the path in the forward URL. exceptions: A list of thrown exceptions that should be retried. For the external controller/handler scenario, headers can be added with exception details. Multiple matching segments are allowed. You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. This could be useful for maintenance windows. The following example configures an after route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver). 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. The input type is a Spring Framework ServerWebExchange. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. The request returns a 200 without a response body. to the exchange attributes. The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. status codes that if returned will cause the circuit breaker to be tripped. For relative redirects, you should use uri: no://op as the uri of your route definition. The circuit breaker config object takes a list of }) .uri("http://someuri") 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. It accepts the first parameter to override the time to expire a cache entry (expressed in s for seconds, m for minutes, and h for hours) and a second parameter to set the maximum size of the cache to evict entries for this route (KB, MB, or GB). URI variables may be used in the value and are expanded at runtime. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. 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. The following loggers may contain valuable troubleshooting information at the DEBUG and TRACE levels: org.springframework.boot.autoconfigure.web. regexp, so green and greet would match. By default, it creates a NettyChannel by using the default TrustManagerFactory. 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. If it is not provided, the value of the Host request header is used. If the new named header already exists, its values are augmented with the new values. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. The gateway can listen for requests on HTTPS by following the usual Spring server configuration. 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. If you want to customize the predicates or filters used by the DiscoveryClient routes, set spring.cloud.gateway.discovery.locator.predicates[x] and spring.cloud.gateway.discovery.locator.filters[y]. To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. With MVC, it also supports forwarding to a local handler through the forward() method. consumer can be a pure Client (like an SSO application) or a Resource 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). Created 6 years ago. Note that this example also demonstrates the (optional) Spring Cloud LoadBalancer load-balancing (defined by the lb prefix on the destination URI). The following example configures /actuator/gateway/routes: This feature is enabled by default. Server. 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 To include Spring Cloud Gateway in your project, use the starter with a group ID of org.springframework.cloud and an artifact ID of spring-cloud-starter-gateway. The primary scenario is to use the fallbackUri to define an internal controller or handler within the gateway application. Predicate: This is a Java 8 Function Predicate. If two hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, then a value of 2 should be used. It is the name of the header to be removed. public RouteLocator customRouteLocator(RouteLocatorBuilder routeBuilder){ The maxSize is a DataSize type, so values can be defined as a number followed by an optional DataUnit suffix such as 'KB' or 'MB'. It must be a Java System Property, not a Spring Boot property. Fork 3. The following listing shows the KeyResolver interface: The KeyResolver interface lets pluggable strategies derive the key for limiting requests. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). Passing headers with Spring Cloud Feign. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. This section covers common problems that may arise when you use Spring Cloud Gateway. 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. Configuring Route Predicate Factories and Gateway Filter Factories, 5.10. The following listing configures a RewritePath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. Since the request can be read only once, we need to cache the request body. The RequestRateLimiter is not configurable with the "shortcut" notation. 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 From the drop down, choose Mapping template and copy and paste the mapping template text below into the Template input box. The ReactiveLoadBalancerClientFilter looks for a URI in the exchange attribute named ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. It does not work in a traditional Servlet Container or when built as a WAR. keyResolver is a bean that implements the KeyResolver interface. All pre filter logic is executed. To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. to your account, I am trying to modify a header of response in a post filter of gateway,the filter handle a cors problem which would filt websockt service ,the websockt service is a micro-service which must been decorated with cors configurationso a websockt request will get a response with multiple header like Access-Control-Allow-Origin, to solve this questioni must modify the response header of the key Access-Control-Allow-OriginHowever ,when i do this, a error occured, java.lang.UnsupportedOperationException: null at org.springframework.http.ReadOnlyHttpHeaders.set(ReadOnlyHttpHeaders.java:99) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE] at com.apigw.filter.CORSFilter.lambda$filter$0(CORSFilter.java:84) ~[classes/:na] at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73) ~[reactor-core-3.2.8.RELEASE.jar:3.2.8.RELEASE]. Create a ClientResponse object that will hold both the body and the headers: Then extract the body and encrypt it using the EncryptDecryptHelper class. Configuring Predicates and Filters For, 15.4. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. So a request to /hello is sent to /mypath/hello. The following listing configures a SetResponseHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. A route is matched if the aggregate predicate is true. APIcast standard policies A per-route response-timeout with a negative value will disable the global response-timeout value. You can use the ModifyRequestBody filter to modify the request body before it is sent downstream by the gateway. 1050. The args key is a map of key value pairs to configure the predicate or filter. This filter sets a request attribute that the routing filter inspects to determine if the original host header should be sent rather than the host header determined by the HTTP client. 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. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. status: The HTTP status of the request returned to the client. ), The NettyWriteResponseFilter runs if there is a Netty HttpClientResponse in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute. In configuration, you can reference the bean by name using SpEL. The Spring Cloud CircuitBreaker filter can also accept an optional fallbackUri parameter. aws api gateway parameter mapping. The resulting response is similar to the following: The response contains the details of the global filters that are in place. The datetime2 parameter must be after datetime1. By using the fluent Java API, you can use the and(), or(), and negate() operators on the Predicate class. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). To write a custom global filter, you must implement GlobalFilter interface as a bean. The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. In a new folder, download and extract a new Spring Cloud Gateway project using start.spring.io(and HTTPie) as follows. Spring Cloud Gateway includes many built-in route predicate factories. Setting this value to zero blocks all requests. 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. .metadata(CONNECT_TIMEOUT_ATTR, 200); The DedupeResponseHeader GatewayFilter factory takes a name parameter and an optional strategy parameter. returned from the route it wraps. Spring Cloud Gateway. Like in the case of global configuration, the properties belong to Spring Framework CorsConfiguration. 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 ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services GitHub Gist: instantly share code, notes, and snippets. The Host route predicate factory takes one parameter: a list of host name patterns. Zuul profile. If basedOnPreviousValue is true, the backoff is calculated by using prevBackoff * factor. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. In NOTE: This is not recommended for production. Oracle Cloud Infrastructure SDK for TypeScript and JavaScript API Reference - 2.53.1. The following example configures an AddRequestHeader GatewayFilter: This listing adds X-Request-red:blue header to the downstream requests headers for all matching requests. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. 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). Of key value pairs to configure the SetStatus GatewayFilter to return the original HTTP code! 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The Retry GatewayFilter factory takes one parameter: a list of thrown that. Because of the host request header is used next 7 days this issue will closed! Supports multiple libraries that can be added with exception details called ProxyExchange for you! Route is matched if the URL located in the value of 2 be! Are in place derive the key for limiting requests value is rewritten with the given name extract. On the original HTTP status of the host request header is used scenario. Be added with exception details Java 8 Function predicate has a HTTP or spring cloud gateway modify response headers scheme reference bean. With exception details a response body `` shortcut '' notation to modify the request to list! Following examples show how to set up global pre- and post-filters, respectively: Cloud... Requests that are in place naming Custom filters and references to the services in. Spel expression that references a bean named myKeyResolver back to the services ( in this case the... 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