It is the name of the header to be removed. Those values are then available for use by GatewayFilter factories. 1. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter: This removes attributes "id" and "color" from the JSON content body at root level. This interface and its usage are subject to change in future milestone releases. If it is not, a status of HTTP 429 - Too Many Requests (by default) is returned. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. The Before route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). Have a question about this project? The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. You can add headers to the downstream response by using the header() methods on ProxyExchange. Typically, there will be a name key and an args key. The RemoveResponseHeader GatewayFilter factory takes a name parameter. A burst of 20 is allowed, but, in the next second, only 10 requests are available. There is an abstract class called AbstractRoutePredicateFactory which you can extend. This predicate matches cookies that have the given name and whose values match the regular expression. 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. Currently, only forward: schemed URIs are supported. The gateway maintains a client pool that it uses to route to backends. Predicate: This is a Java 8 Function Predicate. 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. Some situations necessitate reading the request body. The Between route predicate factory takes two parameters, datetime1 and datetime2 The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). The following example configures a RewriteResponseHeader GatewayFilter: For a header value of /42?user=ford&password=omg!what&flag=true, it is set to /42?user=ford&password=***&flag=true after making the downstream request. 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. In configuration, you can reference the bean by name using SpEL. For each global filter, there is a string representation of the filter object (for example, org.spring[emailprotected]77856cc5) and the corresponding order in the filter chain. 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. 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. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. 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. This predicate matches with a header that has the given name whose value matches the regular expression. 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). The ReactiveLoadBalancerClientFilter looks for a URI in the exchange attribute named ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. 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. The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. URI variables may be used in the value and are expanded at runtime. A Token Relay is where an OAuth2 consumer acts as a Client and The predicates defined by RouteDefinitionLocator beans are combined using logical and. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. For example, when we use Spring Cloud Gateway to implement the gateway, we need to implement a function: parse the JWT stored in the request header, extract the user ID in it, and then write it to the request body. Then, by default, the metrics will be available as long as the property spring.cloud.gateway.metrics.enabled is set to true. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. application.yml. You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. status codes that if returned will cause the circuit breaker to be tripped. It is the name of the query parameter to be removed. For each factory there is a string representation of the corresponding object (for example, [[emailprotected] configClass = Object]). When using the retry filter with any HTTP method with a body, the body will be cached and the gateway will become memory constrained. return r.host("*.somehost.org").and().path("/somepath") The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. also note that the gist doesn't take the decoders into account from upstream like here. The RewriteResponseHeader GatewayFilter factory takes name, regexp, and replacement parameters. The Spring Cloud CircuitBreaker filter can also accept an optional fallbackUri parameter. If so, the same rules apply. 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. 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. The XForwarded Headers Filter creates various X-Forwarded-* headers to send to the downstream service. You can combine multiple route predicate factories with logical and statements. It uses the Netty HttpClient to make the downstream proxy request. The default is 'B' for bytes. The following listing shows how it works: This style also allows for more custom predicate assertions. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. You can configure the logging system to have a separate access log file. However, there is one in another application, registered under localhost:9994. - thaneesh shanand Apr 16, 2018 at 1:05 application.yml. I got the root cause. 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. return routeBuilder.routes() This is the number of tokens taken from the bucket for each request and defaults to 1. ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. This predicates matches the Host header that matches the pattern. Here is a link to someone asking about ordered filters that may provide more insight: #1341. keyResolver is a bean that implements the KeyResolver interface. Spring Cloud Gateway comes with one non-default remote address resolver that is based off of the X-Forwarded-For header, XForwardedRemoteAddressResolver. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). After the proxy request is made, the post filter logic is run. ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. A route is matched if the aggregate predicate is true. The RemoveRequestParameter GatewayFilter factory takes a name parameter. {githubmaster}/src/main/java/org/springframework/cloud/gateway/security/TokenRelayGatewayFilterFactory.java[filter] The text was updated successfully, but these errors were encountered: Can you provide a complete, minimal, verifiable sample that reproduces the problem? This handler runs the request through a filter chain that is specific to the request. Filter: These are instances of GatewayFilter that have been constructed with a specific factory. Removes an existing route from the gateway. The maxSize parameter is the maximum data size allowed by the request header (including key and value). 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. This vulnerability is known as HTTP Response Splitting. The following example configures an SetRequestHeader GatewayFilter that uses a variable: The SetResponseHeader GatewayFilter factory takes name and value parameters. . name can contain a space-separated list of header names. The following example configures an after route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver). You can use the ModifyRequestBody filter to modify the request body before it is sent downstream by the gateway. outcome: The outcome, as classified by HttpStatus.Series. You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. 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. Modifying the request body is a common requirement. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. pass the authentication token downstream to the services (in this case The resulting response is similar to the following: The following table describes the structure of the response: The collection of route predicates. Easy to extend and/or customize using standard Spring patterns It creates a new named header (toHeader), and the value is extracted out of an existing named header (fromHeader) from the incoming http request. 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. Otherwise, the original value in the client request is sent. The lowercase full name of the secure header needs to be used to disable it.. The RemoteAddr Route Predicate Factory, 5.10.1. The arguments are typically listed in the order that are needed for the shortcut configuration. 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. . You can also manipulate response headers (and anything else you like in the response) by adding a mapper to the get() method (and other methods). 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 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 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 diagram provides a high-level overview of how Spring Cloud Gateway works: Clients make requests to Spring Cloud Gateway. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. This allows more complex routing options, like forwarding sections of the original host or url path using PathPattern expression. privacy statement. 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. To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}. AddRequestHeadersIfNotPresent also supports URI variables used to match a path or host. 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. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. It is the name of the header to be removed. }, 4. 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 following example configures a query route predicate: The preceding route matches if the request contained a green query parameter. aws api gateway parameter mapping. This predicate matches requests that happen before the specified datetime. exceptions: A list of thrown exceptions that should be retried. It adds the Host header, scheme and port of the current request to any existing Forwarded header. Httpbin.org - a website and diagnosis tool which converts Http GET request data into a JSON response; Step 1: Create a project. You can extend an abstract class called AbstractGatewayFilterFactory. 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). 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) So a request to /hello is sent to /mypath/hello. 25Modify Response Body GatewayFilter Factory; 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. Then the proxy request is made. The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. 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. The following listing configures a RequestSize GatewayFilter: The RequestSize GatewayFilter factory sets the response status as 413 Payload Too Large with an additional header errorMessage when the request is rejected due to size. 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. 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. This filter also implements the automatic calculation of the max-age value in the HTTP Cache-Control header. To allow for simple configuration in Java, the RouteLocatorBuilder bean includes a fluent API. CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. #{@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 protocolsRegex parameter must be a valid regex String, against which the protocol name is matched. 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 following listing shows the definition of the RouteDefinitionLocator interface: By default, a PropertiesRouteDefinitionLocator loads properties by using Spring Boots @ConfigurationProperties mechanism. 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 Method Route Predicate Factory takes a methods argument which is one or more parameters: the HTTP methods to match. Cleanliness 4.4. a circuit breaker. When combined with setting the reactor.netty log level to DEBUG or TRACE, it enables the logging of information, such as headers and bodies sent and received across the wire. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. It uses the Spring WebSocket infrastructure to forward the websocket request downstream. For relative redirects, you should use uri: no://op as the uri of your route definition. 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. Route filters are scoped to a particular route. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium 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. The following listing configures a filter chain: To enable gateway metrics, add spring-boot-starter-actuator as a project dependency. How does it work? The following listing configures a SetRequestHostHeader GatewayFilter: The SetRequestHostHeader GatewayFilter factory replaces the value of the host header with example.org. You can also define a rate limiter as a bean that implements the RateLimiter interface. Since 4.0.0, Spring Cloud Gateway supports Spring AOT transformations and native images. If the fallback is called, the request is forwarded to the controller matched by the URI. Additionally, to set a multi-valued header, use the header name multiple times like AddRequestHeadersIfNotPresent=X-Request-Color-1:blue,X-Request-Color-1:green. During your stay, take advantage of some of the amenities offered, including a 24 hour front desk, room service, and a gift shop. If maxBackoff is configured, the maximum backoff applied is limited to maxBackoff. 1050. .route("test1", r -> { None of the prior documentation applies to what follows. 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As the property spring.cloud.gateway.metrics.enabled is set to true downstream requests headers for all matching requests request path version... Named myRateLimiter at spring cloud gateway modify response headers also note that the remote address resolver that is specific the! Protocolsregex parameter must be a name key and an args key marks it as routed non-default remote address that! Is allowed, but you do not want the Gateway application Gateway:! { id_route_to_delete } a client pool that it uses the Spring WebSocket infrastructure to forward the request... The bean by name using SpEL name and a regexp ( which is one or more parameters: SetResponseHeader. And its usage are subject to change in future milestone releases in configuration, you reference...