The protocolsRegex parameter must be a valid regex String, against which the protocol name is matched. 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. return routeBuilder.routes() To write a GatewayFilter, you must implement GatewayFilterFactory as a bean. The following listing configures a websocket routing filter: After the gateway has routed a ServerWebExchange, it marks that exchange as routed by adding gatewayAlreadyRouted keyResolver is a bean that implements the KeyResolver interface. 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). Setting this value to zero blocks all requests. It may be the integer value 404 or the string representation of the enumeration: NOT_FOUND. Appending multiple headers can be controlled by the following boolean properties (defaults to true): spring.cloud.gateway.x-forwarded.for-append, spring.cloud.gateway.x-forwarded.host-append, spring.cloud.gateway.x-forwarded.port-append, spring.cloud.gateway.x-forwarded.proto-append, spring.cloud.gateway.x-forwarded.prefix-append. For example, given a Gateway that has 1 replica, the following will . To enable wiretap, set spring.cloud.gateway.httpserver.wiretap=true or spring.cloud.gateway.httpclient.wiretap=true for the HttpServer and HttpClient, respectively. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. A burst of 20 is allowed, but, in the next second, only 10 requests are available. .build(); You can use the CacheRequestBody filter to cache the request body before sending it downstream and getting the body from exchange attribute. 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. ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. The header is added to the response if configured with the following property: The StripPrefix GatewayFilter factory takes one parameter, parts. 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). This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. The filter takes a maxSize parameter. The DedupeResponseHeader GatewayFilter factory takes a name parameter and an optional strategy parameter. Like in the case of global configuration, the properties belong to Spring Framework CorsConfiguration. Retries are performed after a backoff interval of firstBackoff * (factor ^ n), where n is the iteration. The following example shows such an errorMessage: There are certain situation when the host header may need to be overridden. Fork 3. 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. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. The default is 'B' for bytes. Looking for a place to stay in Gunzenhausen? 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. 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. 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. The most noteworthy thing here is: ServerHttpRequest or HttpMessage interface provides a method to get the request headers HttpHeaders getHeaders(); returns a read-only instance, specifically of type ReadOnlyHttpHeaders, mentioned here more than once I wrote this blog post using Spring Cloud Gateway version Greenwich.SR1. 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. The following properties are available: To disable the default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values. spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org predicates: - Host: {segment}.myhost.org filters: - AddResponseHeader=foo,bar-{segment} Note that this example also demonstrates the (optional) Spring Cloud LoadBalancer load-balancing (defined by the lb prefix on the destination URI). The Reactor Netty HttpClient and HttpServer can have wiretap enabled. 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 example shows how to do so: The SetPath GatewayFilter factory takes a path template parameter. Here is a link to someone asking about ordered filters that may provide more insight: #1341. extracts an access token from the currently authenticated user, The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. By default, if the KeyResolver does not find a key, requests are denied. 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. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. 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. essentially skipping the filter. This filter takes an optional keyResolver parameter and parameters specific to the rate limiter (described later in this section). The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. The accepted values are RETAIN_FIRST (default), RETAIN_LAST, and RETAIN_UNIQUE. the request should only be allowed if it comes from a trusted list of IP addresses used by those You can configure the logging system to have a separate access log file. 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. Since 4.0.0, Spring Cloud Gateway supports Spring AOT transformations and native images. To configure per-route timeouts: Temporary bursts can be allowed by setting burstCapacity higher than replenishRate. The RewriteResponseHeader GatewayFilter factory takes name, regexp, and replacement parameters. It is the permissible size limit of the request defined in bytes. 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. The following example shows what this looks like: To enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true. The default filter is a rewrite path filter with the regex /serviceId/?(?. GatewaySampleApplication.java. 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). Configuring Predicates and Filters For, 15.4. 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 To see the list of all Spring Cloud Gateway related configuration properties, see the appendix. It creates a new URI, based off of the request URI but updated with the URI attribute of the Route object. You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. The RemoveRequestHeader GatewayFilter factory takes a name parameter. The following example configures an AddRequestHeader GatewayFilter: This listing adds X-Request-red:blue header to the downstream requests headers for all matching requests. You can extend an abstract class called AbstractGatewayFilterFactory. It is added to the ServerWebExchange as the ServerWebExchangeUtils.CIRCUITBREAKER_EXECUTION_EXCEPTION_ATTR attribute that can be used when handling the fallback within the gateway application. The following example configures a PrefixPath GatewayFilter: This prefixes /mypath to the path of all matching requests. Spring Cloud Gateway offers two RouteDefinitionRepository implementations. 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'. The following example configures a MapRequestHeader: This adds the X-Request-Red: header to the downstream request with updated values from the incoming HTTP requests Blue header. value or the String representation of the HttpStatus enumeration. 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. 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 Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. URI variables may be used in the value and are expanded at runtime. Then, by default, the gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled property is not set to false. To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. The gateway maintains a client pool that it uses to route to backends. 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). (There is also an experimental WebClientWriteResponseFilter that performs the same function but does not require Netty.). It uses Java regular expressions for a flexible way to rewrite the response header value. Filter: These are instances of GatewayFilter that have been constructed with a specific factory. The AddRequestHeader GatewayFilter factory takes a name and value parameter. Acompanhe-nos: can gabapentin help with bell's palsy Facebook Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. 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. 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). To allow for simple configuration in Java, the RouteLocatorBuilder bean includes a fluent API. This interface and its usage are subject to change in future milestone releases. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. A utility method (called get) is available to make access to these variables easier. 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 Configure for High Availability. This route matches if the request has a Host header with a value of www.somehost.org or beta.somehost.org or www.anotherhost.org. AddResponseHeader is aware of URI variables used to match a path or host. Retrieving Information about a Particular Route, 15.6. It adds the Host header, scheme and port of the current request to any existing Forwarded header. ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. Policy to specify how to modify the response code, body and headers. 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)'. Spring Cloud Gateway includes many built-in GatewayFilter Factories. To retrieve information about a single route, make a GET request to /actuator/gateway/routes/{id} (for example, /actuator/gateway/routes/first_route). connect-timeout must be specified in milliseconds. In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. {githubmaster}/src/main/java/org/springframework/cloud/gateway/security/TokenRelayGatewayFilterFactory.java[filter] 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) also note that the gist doesn't take the decoders into account from upstream like here. Generally, it will put the identity information into the request header and will not modify the content of the request and response. it is proxying. 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.) 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]. The stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. Created 6 years ago. which are java ZonedDateTime objects. Sign in If you would like us to look at this issue, please provide the requested information and we will re-open the issue. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services See the Spring Cloud Project page for details on setting up your build system with the current Spring Cloud Release Train. The following example configures a SaveSession GatewayFilter: If you integrate Spring Security with Spring Session and want to ensure security details have been forwarded to the remote process, this is critical. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. Here, you can modify requests and responses before or after sending the downstream request. 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.

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