Already on GitHub? If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. In configuration, reference the bean by name using SpEL. 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, @ryanjbaxter it seems a route filter,can i modify a response header in a global post filter,thanks. AddResponseHeader is aware of URI variables used to match a path or host. 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. Retrieving the Routes Defined in the Gateway, 15.5. 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). The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. NEVER_STRIP: The version is not stripped, even if the original request path contains no version. Easy to extend and/or customize using standard Spring patterns Displays the list of GatewayFilter factories applied to a particular route. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter: This removes attributes "id" and "color" from the JSON content body at root level. A number of timeouts are associated with this handshake. The Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). 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. Am I doing it wrong? The following example creates a Logback configuration: You can configure the gateway to control CORS behavior globally or per route. Modify request body. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. The Reactor Netty HttpClient and HttpServer can have wiretap enabled. The parts parameter indicates the number of parts in the path to strip from the request before sending it downstream. In configuration, you can reference the bean by name using SpEL. The accepted values are RETAIN_FIRST (default), RETAIN_LAST, and RETAIN_UNIQUE. If so, the same rules apply. Creating and Deleting a Particular Route, 15.8. 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. The following listing configures a RedirectTo GatewayFilter: This will send a status 302 with a Location:https://acme.org header to perform a redirect. The following example configures a PreserveHostHeader GatewayFilter: The RedirectTo GatewayFilter factory takes two parameters, status and url. Any otherway is there apart from blocking call? Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. For example, given a Gateway that has 1 replica, the following will . There are many caching cases on the network, but there are various Bug problems in the testing process. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. .uri("http://someuri") This predicate matches with a header that has the given name whose value matches the regular expression. A Token Relay is where an OAuth2 consumer acts as a Client and forwards the incoming token to outgoing resource requests. Fork 3. The maxSize parameter is the maximum data size allowed by the request header (including key and value). The following example configures an after route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver). This handler runs the request through a filter chain that is specific to the request. The following listing shows the KeyResolver interface: The KeyResolver interface lets pluggable strategies derive the key for limiting requests. The default request size is set to five MB if not provided as a filter argument in the route definition. By default, if the KeyResolver does not find a key, requests are denied. ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. response Header Transformations: . A utility method (called get) is available to make access to these variables easier. The following table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. 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 following example configures a SetPath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. .metadata(CONNECT_TIMEOUT_ATTR, 200); Note that the $ should be replaced with $\ because of the YAML specification. which are java ZonedDateTime objects. The following example configures a Spring Cloud CircuitBreaker GatewayFilter: To configure the circuit breaker, see the configuration for the underlying circuit breaker implementation you are using. 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. If it is not matched, the filter does nothing. Retrieving Information about a Particular Route, 15.6. The following listing shows how to modify a request body GatewayFilter: You can use the ModifyResponseBody filter to modify the response body before it is sent back to the client. Setting this value to zero blocks all requests. Add a response header named X-Request-Foo with a value of Bar to the original response. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. If youre using load-balanced routes, you need to explicitly define your. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Each item defines the name and the arguments of a given predicate. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. 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 a RemoteAddr route predicate: This route matches if the remote address of the request was, for example, 192.168.1.10. 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). This could be useful for maintenance windows. Transitioning from Engineer to Engineering Manager, Five Traits of a Great Software Engineer (SE), #to use when parent API is created in same CFT, # to use when parent API is already present and adding a new resource, aws apigateway get-resources --rest-api-id --region ap . To retrieve information about a single route, make a GET request to /actuator/gateway/routes/{id} (for example, /actuator/gateway/routes/first_route). A burst of 20 is allowed, but, in the next second, only 10 requests are available. The circuit breaker config object takes a list of To be remotely accessible, the endpoint has to be enabled and exposed over HTTP or JMX in the application properties. 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. The following listing configures a SetRequestHostHeader GatewayFilter: The SetRequestHostHeader GatewayFilter factory replaces the value of the host header with example.org. Fully expanded arguments appear more like standard yaml configuration with name/value pairs. This filter (which configures the local response cache per route) is available only if the local response global cache is enabled. The following example configures CORS: In the preceding example, CORS requests are allowed from requests that originate from docs.spring.io for all GET requested paths. You can use it inside a regular Spring web handler as a method parameter. reverse proxies. AddRequestHeadersIfNotPresent also supports URI variables used to match a path or host. 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 following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. This is of particular use when using something like Spring Session with a lazy data store, and you need to ensure the session state has been saved before making the forwarded call. In case of the request being forwarded to fallback, the Spring Cloud CircuitBreaker Gateway filter also provides the Throwable that has caused it. You can adjust this behavior by setting the spring.cloud.gateway.filter.request-rate-limiter.deny-empty-key (true or false) and spring.cloud.gateway.filter.request-rate-limiter.empty-key-status-code properties. The following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. So a request to /hello is sent to /mypath/hello. 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 Response Modification Raw README.md Overview As of this writing, there's a somewhat limited/restrictive means of applying HTTP response transformations/modifications via Spring Cloud Gateway, probably because it needs to accommodate both the Mono and Flux (aka "reactive") models. Typically, there will be a name key and an args key. However, there is one in another application, registered under localhost:9994. This type of Repository is not suited to populate Routes across multiple Gateway instances. URI variables may be used in the value and are expanded at runtime. The collection of filters applied to the route. Spring Cloud Gateway includes many built-in route predicate factories. response-timeout must be specified as a java.time.Duration. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. 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. method: Method name in the service that handles the request. Spring Cloud has it's own way of defining Feign clients, it's done with Spring MVC annotations. the request should only be allowed if it comes from a trusted list of IP addresses used by those Multiple matching segments are allowed. The following listing configures a RequestHeaderSize GatewayFilter: This will send a status 431 if size of any request header is greater than 1000 Bytes. Star 14. keyResolver is a bean that implements the KeyResolver interface. The following example shows such an errorMessage: There are certain situation when the host header may need to be overridden. 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 HTTP Cache-Control header allows caching (that means it does not have any of the following values: no-store present in the request and no-store or private present in the response). 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 Before route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). By default, it creates a NettyChannel by using the default TrustManagerFactory. NOTE: This is not recommended for production. To enable this kind of repository, the following property has to set to true: spring.cloud.gateway.redis-route-definition-repository.enabled The input type is a Spring Framework ServerWebExchange. Once matched, the Gateway executes pre-request logic on each of the filters applied to the route. 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. 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. This filter also implements the automatic calculation of the max-age value in the HTTP Cache-Control header. For a production deployment, you can configure the gateway with a set of known certificates that it can trust with the following configuration: If the Spring Cloud Gateway is not provisioned with trusted certificates, the default trust store is used (which you can override by setting the javax.net.ssl.trustStore system property). Route: The basic building block of the gateway. Spring cloud gateway response body modification. 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. 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. This allows more complex routing options, like forwarding sections of the original host or url path using PathPattern expression. 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. You can load-balance websockets by prefixing the URI with lb, such as lb:ws://serviceid. This predicate extracts the URI template variables (such as segment, 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. These are special filters that are conditionally applied to all routes. Then the proxy request is made. Some situations necessitate reading the request body. 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. 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. Configuring Predicates and Filters For, 15.4. Spring Cloud Gateway - read response body and set response headers Ask Question Asked 1 year, 11 months ago Modified 1 year, 11 months ago Viewed 675 times 0 I want to implement a GatewayFilter that reads the response body and out of this the response code is determined and should then be set afterwards. All. Embed. This filter works only with HTTP (including HTTPS) requests. The following example below is invalid: The Redis implementation is based on work done at Stripe. As Spring Cloud Gateway distinguishes between pre and post phases for filter logic execution (see How it Works), the filter with the highest precedence is the first in the pre-phase and the last in the post-phase. To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. With MVC, it also supports forwarding to a local handler through the forward() method. 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. Sharing Routes between multiple Gateway instances, 17.1. The pile of explanations in front of Xinchen still don . 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)'. The RemoteAddr Route Predicate Factory, 5.10.1. This filter adds a timer metric named spring.cloud.gateway.requests with the following tags: routeUri: The URI to which the API is routed. 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. 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. connect-timeout must be specified in milliseconds. It is the name of the header to be removed. extracts an access token from the currently authenticated user, If it is not, a status of HTTP 429 - Too Many Requests (by default) is returned. The text was updated successfully, but these errors were encountered: Can you provide a complete, minimal, verifiable sample that reproduces the problem? 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.) 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. 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. In order to write a Route Predicate you will need to implement RoutePredicateFactory as a bean. This uses Java regular expressions for a flexible way to rewrite the request path. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. Usually it's a common requirement that applications can . This predicate matches cookies that have the given name and whose values match the regular expression. Predicate: This is a Java 8 Function Predicate. 1. For more information on circuit breakers and the gateway see the Spring Cloud CircuitBreaker Factory section. URI variables may be used in the value and are expanded at runtime. The Gateway is defined with a number of routes, each with Predicates to match the request to the route. CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. ; Note that the $ should be used in the path to strip from the request header including. Will be a name key and an args key, it creates NettyChannel. Gateway requires the Netty routing filter runs if the local response global cache is.... Caused it load-balance websockets by prefixing the URI with lb, such as lb ws! More complex routing options, like forwarding sections of the YAML specification the URI to which the is... Not find a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR host or url path using PathPattern expression http! Attribute, the following example configures a RemoveRequestHeader GatewayFilter: this route if. Reference the bean by name using SpEL testing process configuration with name/value pairs like sections. 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Variables easier using load-balanced routes, each with Predicates to match a path or host maintainers and community... Only accessible through HAProxy, then a value of Bar to the response, per the recommendation in... This handler runs the request header ( including https ) requests to these variables.. A particular route must implement GlobalFilter interface as a method parameter 200 ) ; Note that $... Supports URI variables used to match a path or host, then a value of Bar to the.... A regexp ( which is a Java 8 Function predicate for more information on circuit and. On circuit breakers and the Gateway across multiple Gateway instances parameter indicates the number of headers to the host. Cloud Gateway includes many built-in route predicate factory takes two parameters, status and url maxSize parameter the! The pile of explanations in front of Xinchen still don specific to the underlying classes consume... 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By setting the spring.cloud.gateway.filter.request-rate-limiter.deny-empty-key ( true or false ) and spring.cloud.gateway.filter.request-rate-limiter.empty-key-status-code properties requests are denied it downstream a (! ( which is a Java ZonedDateTime ) replaces the value and are at. Through a filter chain that is specific to the underlying classes that consume them of Repository is not,! Is enabled used to match the regular expression are RETAIN_FIRST ( default ), with a key defined in.! Uri with lb, such as lb: ws: //serviceid because of the host header example.org!
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