This can be used with reverse proxies such as load balancers or web application firewalls where In case of the request being forwarded to fallback, the Spring Cloud CircuitBreaker Gateway filter also provides the Throwable that has caused it. The lowercase full name of the secure header needs to be used to disable it.. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium The Code Revisions 1 Stars 14 Forks 3. To change the default values, set the appropriate property in the spring.cloud.gateway.filter.secure-headers namespace. It does not work in a traditional Servlet Container or when built as a WAR. Raw. Modifying the Way Remote Addresses Are Resolved, 5.12. Route filters are scoped to a particular route. To enable the Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath. 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 If maxBackoff is configured, the maximum backoff applied is limited to maxBackoff. To write a custom global filter, you must implement GlobalFilter interface as a bean. 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]. status codes you want to trip the circuit breaker you can either use an integer with the status code it is proxying. It requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. We do this already There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. The RemoveRequestHeader GatewayFilter factory takes a name parameter. application.yml. httpMethod: The HTTP method used for the request. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. The redis-rate-limiter.requestedTokens property is how many tokens a request costs. GitHub Gist: instantly share code, notes, and snippets. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. pass the authentication token downstream to the services (in this case For relative redirects, you should use uri: no://op as the uri of your route definition. This filter takes an optional keyResolver parameter and parameters specific to the rate limiter (described later in this section). .uri("http://someuri") The XForwarded Remote Addr 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). Once a request has been marked as routed, other routing filters will not route the request again, Server. By using the fluent Java API, you can use the and(), or(), and negate() operators on the Predicate class. SetRequestHeader is aware of URI variables used to match a path or host. The hostValue parameter, if provided, is used to replace the host:port portion of the response Location header. When using the retry filter with any HTTP method with a body, the body will be cached and the gateway will become memory constrained. It must be a valid Spring HttpStatus. The datetime2 parameter must be after datetime1. Already on GitHub? 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). Multiple matching segments are allowed. Predicate: This is a Java 8 Function Predicate. 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. If you would like us to look at this issue, please provide the requested information and we will re-open the issue. The reason the filters are divided by the dotted line is that filters can run logic both before and after the proxy request is sent. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. For example, you can match on the path segment of the URL or the HTTP method of the request. The following example below is invalid: The Redis implementation is based on work done at Stripe. method: Method name in the service that handles the request. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. Various properties can be specified inside your application.properties file, inside your application.yml file, or as command line switches. }, 4. Have a question about this project? The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. (There is also an experimental WebClientHttpRoutingFilter that performs the same function but does not require Netty. The filter takes a maxSize parameter. It adds the Host header, scheme and port of the current request to any existing Forwarded header. 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 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. .route("test1", r -> { None of the prior documentation applies to what follows. forwards the incoming token to outgoing resource requests. 3,AddResponseHeader GatewayFilter Factory. 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. Embed. Here, you can modify requests and responses before or after sending the downstream request. Created 6 years ago. The SetRequestHeader GatewayFilter factory takes name and value parameters. It uses the Spring WebSocket infrastructure to forward the websocket request downstream. The resulting response is similar to the following: The following table describes the structure of the response: The collection of route predicates. application.yml. spring.cloud.gateway.filter.local-response-cache.size: Sets the maximum size of the cache to evict entries for this route (in KB, MB and GB). In order to share Routes across a cluster of Spring Cloud Gateway instances, RedisRouteDefinitionRepository can be used. By default, the gateway defines a single predicate and filter for routes created with a DiscoveryClient. The following example shows how to achieve the same configuration with Java: The Weight route predicate factory takes two arguments: group and weight (an int). 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. It offers a simple way to manipulate the request path by allowing templated segments of the path. org.springframework.cloud.gateway.filter.factory.rewrite.ModifyResponseBodyGatewayFilterFactory body gzipchunkedHTTP Filter MonoFluxtry catch .just (xxx).doOnError () 2.2 The AddRequestHeader GatewayFilter factory takes a name and value parameter. 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. URI variables may be used in the value and will be expanded at runtime. Add a response header named X-Request-Foo with a value of Bar to the original response. The following example shows how to use the get method: The Query route predicate factory takes two parameters: a required param and an optional regexp (which is a Java regular expression). aws api gateway parameter mapping. Removes an existing route from the gateway. There should be no reason why a filter cannot modify a response header. 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). GatewaySampleApplication.java. a circuit breaker. 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. .metadata(CONNECT_TIMEOUT_ATTR, 200); . Once matched, the Gateway executes pre-request logic on each of the filters applied to the route. The following example configures a method route predicate: This route matches if the request method was a GET or a POST. 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. The following examples show how to do so: Custom filters class names should end in GatewayFilterFactory. The following listing shows how to modify a response body GatewayFilter: The PrefixPath GatewayFilter factory takes a single prefix parameter. So a request to /hello is sent to /mypath/hello. 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 following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. CircuitBreaker also supports URI variables in the fallbackUri. This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method. This property takes a list of filters. The maxSize parameter is the maximum data size allowed by the request header (including key and value). In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. 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. return routeBuilder.routes() To allow for simple configuration in Java, the RouteLocatorBuilder bean includes a fluent API. By default, it creates a NettyChannel by using the default TrustManagerFactory. 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. 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. Displays the list of routes defined in the gateway. public RouteLocator customRouteLocator(RouteLocatorBuilder routeBuilder){ 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. It provides a convenient method to apply a transformation to JSON body content by deleting attributes from it. The route configuration allows applying CORS directly to a route as metadata with key cors. if you intend to modify a JSON response body prior to returning to the client, the above gist will not work (i know because i tried). The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. 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). The RewritePath GatewayFilter factory takes a path regexp parameter and a replacement parameter. . AS_IN_REQUEST: The version is stripped only if the original request path contains no version. I think i have to go for a blocking call here. Modifying the request body is a common requirement. Writing Custom Route Predicate Factories, 17.2. In this situation, the SetRequestHostHeader GatewayFilter factory can replace the existing host header with a specified value. All of these predicates match on different attributes of the HTTP request. 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. For example, to reference a filter named Something in configuration files, the filter 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. However, there is one in another application, registered under localhost:9994. 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. This filter (which configures the local response cache per route) is available only if the local response global cache is enabled. The response is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a . The weights are calculated per group. The following example configures an SetRequestHeader GatewayFilter that uses a variable: The SetResponseHeader GatewayFilter factory takes name and value parameters. While a Gateway is running you can use kubectl scale to modify the number of replicas. Typically, there will be a name key and an args key. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. The following example configures a path route predicate: This route matches if the request path was, for example: /red/1 or /red/1/ or /red/blue or /blue/green. A Token Relay is where an OAuth2 consumer acts as a Client and The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. 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. Spring Cloud Gateway. AddResponseHeader is aware of URI variables used to match a path or host. AddResponseHeader is aware of URI variables used to match a path or host. to the exchange attributes. I got the root cause. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. essentially skipping the filter. The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. APIcast standard policies 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. Spring Cloud Gateway matches routes as part of the Spring WebFlux HandlerMapping infrastructure. There are many caching cases on the network, but there are various Bug problems in the testing process. If it is not provided, the value of the Host request header is used. The Reactor Netty HttpClient and HttpServer can have wiretap enabled. This filter can be configured only by using the Java DSL. Since 4.0.0, Spring Cloud Gateway supports Spring AOT transformations and native images. This uses the URI templates from Spring Framework. When doing so, you need to make sure to include the default predicate and filter shown earlier, if you want to retain that functionality. 25Modify Response Body GatewayFilter Factory; See the documentation for @RequestMapping in Spring MVC for more details of those features. The following headers (shown with their default values) are added: Strict-Transport-Security (max-age=631138519), Content-Security-Policy (default-src 'self' https:; font-src 'self' https: data:; img-src 'self' https: data:; object-src 'none'; script-src https:; style-src 'self' https: 'unsafe-inline)'. It is the permissible size limit of the request defined in bytes. Properties. regexp, so green and greet would match. Spring Cloud Gateway includes many built-in route predicate factories. Spring Cloud Gateway comes with one non-default remote address resolver that is based off of the X-Forwarded-For header, XForwardedRemoteAddressResolver. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. For more information on circuit breakers and the gateway see the Spring Cloud CircuitBreaker Factory section. Displays the list of GatewayFilter factories applied to a particular route. The following describes an alternative style gateway. You must use $\ to mean $ because of the YAML specification. The Host route predicate factory takes one parameter: a list of host name patterns. In addition, you can configure this filter once by using spring.cloud.gateway.default-filters and have it applied to all routes. Configure for High Availability. Currently, only forward: schemed URIs are supported. In addition, through the spring.cloud.gateway.metrics.tags.path.enabled property (by default, false), you can activate an extra metric with the path tag: These metrics are then available to be scraped from /actuator/metrics/spring.cloud.gateway.requests and can be easily integrated with Prometheus to create a Grafana dashboard. The new URI is placed in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute. 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). 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 following example configures a between route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver) and before Jan 21, 2017 17:42 Mountain Time (Denver). A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. The following listing configures a SetRequestHostHeader GatewayFilter: The SetRequestHostHeader GatewayFilter factory replaces the value of the host header with example.org. The resulting response is similar to the following: The response contains the details of all the routes defined in the gateway. Since the request can be read only once, we need to cache the request body. The earlier configuration examples all use a shortcut notation that uses positional arguments rather than named ones. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). 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. To enable this for Spring Cloud Gateway add the following dependencies, org.springframework.boot:spring-boot-starter-oauth2-client. 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. During your stay, take advantage of some of the amenities offered, including a 24 hour front desk, room service, and a gift shop. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. Likewise to the RedisRateLimiter Filter Factory it requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. 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. To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. .build(); 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 gateway maintains a client pool that it uses to route to backends. The following example creates a Logback configuration: You can configure the gateway to control CORS behavior globally or per route. If the input header does not exist, the filter has no impact. 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. For example, given a Gateway that has 1 replica, the following will . Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. 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 example configures a weight route predicate: This route would forward ~80% of traffic to weighthigh.org and ~20% of traffic to weighlow.org. It is the name of the header to be removed. If the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a ws or wss scheme, the websocket routing filter runs. The request returns a 200 without a response body. We've already covered its basic usage in earlier tutorials, so we won't get into those aspects here. The default filter is a rewrite path filter with the regex /serviceId/?(?
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