spring cloud gateway modify response headers
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. 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 add this functionality to the gateway, you need to add the TokenRelayGatewayFilterFactory like this: and it will (in addition to logging the user in and grabbing a token) It uses the Host header, scheme, port and path of the current request to create the various headers. This predicate matches cookies that have the given name and whose values match the regular expression. The mapper is a Function that takes the incoming ResponseEntity and converts it to an outgoing one. Star 14. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. GatewaySampleApplication.java. 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. let's see. By default, it creates a NettyChannel by using the default TrustManagerFactory. You can load-balance websockets by prefixing the URI with lb, such as lb:ws://serviceid. This could be useful for maintenance windows. All. The preceding route matches if the request contained a red query parameter whose value matched the gree. Each item defines the name and the arguments of a given predicate. Download ZIP. 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. 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. This lets you match on anything from the HTTP request, such as headers or parameters. This route predicate allows requests to be filtered based on the X-Forwarded-For HTTP header. It uses the Netty HttpClient to make the downstream proxy request. The resulting response is similar to the following: The response contains the details of all the routes defined in the gateway. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. response-timeout must be specified in milliseconds. Well occasionally send you account related emails. How does it work? By default, if the KeyResolver does not find a key, requests are denied. URI variables may be used in the value and are expanded at runtime. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. You can read more about them in the. The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. The global CORS configuration is a map of URL patterns to Spring Framework CorsConfiguration. returned from the route it wraps. Some situations necessitate reading the request body. The gateway can listen for requests on HTTPS by following the usual Spring server configuration. By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. . Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. 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. By default, the gateway defines a single predicate and filter for routes created with a DiscoveryClient. methods: The HTTP methods that should be retried, represented by using org.springframework.http.HttpMethod. See the documentation for @RequestMapping in Spring MVC for more details of those features. This is the number of tokens taken from the bucket for each request and defaults to 1. Let's simplify this scenario. I got the root cause. In addition, you can configure this filter once by using spring.cloud.gateway.default-filters and have it applied to all routes. The following example configures an AddRequestHeadersIfNotPresent GatewayFilter: This listing adds 2 headers X-Request-Color-1:blue and X-Request-Color-2:green to the downstream requests headers for all matching requests. Then, by default, the gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled property is not set to false. The default predicate is a path predicate defined with the pattern /serviceId/**, where serviceId is We do this already 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 ? To disable it, set the following property: This will default to true in a future release. The following two examples are equivalent: For some usages of the gateway, properties are adequate, but some production use cases benefit from loading configuration from an external source, such as a database. The following properties are available: To disable the default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values. A gauge metric named spring.cloud.gateway.routes.count will be added, whose value is the number of RouteDefinitions. Service 4.3. You can also define a rate limiter as a bean that implements the RateLimiter interface. The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. Zuul profile. }, 4. If the new named header already exists, its values are augmented with the new values. The following listing defines a set of default filters: The GlobalFilter interface has the same signature as GatewayFilter. If basedOnPreviousValue is true, the backoff is calculated by using prevBackoff * factor. It takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters. The SetRequestHeader GatewayFilter factory takes name and value parameters. AddRequestParameter is aware of the URI variables used to match a path or host. The body is cached in a request attribute defined by. The following listing shows how it works: This style also allows for more custom predicate assertions. 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. All of these predicates match on different attributes of the HTTP request. The following defaults are configured for Retry filter, if enabled: exceptions: IOException and TimeoutException. 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). if. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. Those values are then available for use by GatewayFilter factories. APIcast standard policies URI variables may be used in the value and are expanded at runtime. 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. backoff: The configured exponential backoff for the retries. 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). 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). 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. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. The Gateway is defined with a number of routes, each with Predicates to match the request to the route. The following listing configures a websocket routing filter: After the gateway has routed a ServerWebExchange, it marks that exchange as routed by adding gatewayAlreadyRouted The following diagram provides a high-level overview of how Spring Cloud Gateway works: Clients make requests to Spring Cloud Gateway. It provides a convenient method to apply a transformation to JSON body content by deleting attributes from it. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. Creating and Deleting a Particular Route, 15.8. AS_IN_REQUEST: The version is stripped only if the original request path contains no version. If two hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, then a value of 2 should be used. Retries are performed after a backoff interval of firstBackoff * (factor ^ n), where n is the iteration. Retrieving the Routes Defined in the Gateway, 15.5. It can be used as API gateway in microservice architecture and supports dynamic routing and filtering functions. org.springframework.cloud.gateway.filter.factory.rewrite.ModifyResponseBodyGatewayFilterFactory body gzipchunkedHTTP Filter MonoFluxtry catch .just (xxx).doOnError () 2.2 The following example shows such an errorMessage: There are certain situation when the host header may need to be overridden. If the URL has a lb scheme (such as lb://myservice), it uses the Spring Cloud ReactorLoadBalancer to resolve the name (myservice in this example) to an actual host and port and replaces the URI in the same attribute. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). The resulting response is similar to the following: The response contains the details of the global filters that are in place. If matchTrailingSlash is set to false, then request path /red/1/ will not be matched. essentially skipping the filter. 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