This uses Java regular expressions for a flexible way to rewrite the request path. Spring cloud gateway response body modification. 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. Create a ClientResponse object that will hold both the body and the headers: Then extract the body and encrypt it using the EncryptDecryptHelper class. It also allows you to pass multi-value headers in the API response to implement things like sending multiple Set-Cookie headers. The following diagram provides a high-level overview of how Spring Cloud Gateway works: Clients make requests to Spring Cloud Gateway. A Token Relay is where an OAuth2 consumer acts as a Client and For relative redirects, you should use uri: no://op as the uri of your route definition. Fork 3. The redis-rate-limiter.burstCapacity property is the maximum number of requests a user is allowed in a single second (without any dropped requests). This predicate matches requests that happen after datetime1 and before datetime2. The following listing shows the KeyResolver interface: The KeyResolver interface lets pluggable strategies derive the key for limiting requests. The path part of the request URL is overridden with the path in the forward URL. The url parameter should be a valid URL. The redis-rate-limiter.replenishRate property defines how many requests per second to allow (without any dropped requests). The predicates defined by RouteDefinitionLocator beans are combined using logical and. Modifying the Way Remote Addresses Are Resolved, 5.12. privacy statement. This predicate extracts the URI template variables (such as sub, 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. AddRequestHeadersIfNotPresent also supports URI variables used to match a path or host. In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. The following example shows what this looks like: To enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true. Oracle Cloud Infrastructure SDK for TypeScript and JavaScript API Reference - 2.53.1. Star 14. The resulting response is similar to the following: The following table describes the structure of the response: The collection of route predicates. First-class support is provided for sensitive headers (by default, cookie and authorization), which are not passed downstream, and for proxy (x-forwarded-*) headers. Well occasionally send you account related emails. also note that the gist doesn't take the decoders into account from upstream like here. statuses: The HTTP status codes that should be retried, represented by using org.springframework.http.HttpStatus. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. The default is http|https|ftp|ftps. If youre using load-balanced routes, you need to explicitly define your. 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. This metric will be available from /actuator/metrics/spring.cloud.gateway.routes.count. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). The algorithm used is the Token Bucket Algorithm. 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]. If max-age is present on the original response, the value is rewritten with the number of seconds set in the timeToLive configuration parameter. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. connect-timeout must be specified in milliseconds. The following listing shows how to add local response cache GatewayFilter: The MapRequestHeader GatewayFilter factory takes fromHeader and toHeader parameters. 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. By clicking Sign up for GitHub, you agree to our terms of service and Then, by default, the metrics will be available as long as the property spring.cloud.gateway.metrics.enabled is set to true. To enable the Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath. Configuring Route Predicate Factories and Gateway Filter Factories, 5.10. In the next tutorial of Spring Cloud Gateway Example we will implement these theories and build an application with microservice architecture using Spring Cloud Gateway and demonstrate working examples on web filters to modify request and response body. 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 add headers to the downstream response by using the header() methods on ProxyExchange. The RewritePath GatewayFilter factory takes a path regexp parameter and a replacement parameter. The input type is a Spring Framework ServerWebExchange. None of the prior documentation applies to what follows. The Before route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). application.yml. 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. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. 2016-10-05: 4.3: CVE-2016-6426 CISCO This uses the URI templates from Spring Framework. If you would like us to look at this issue, please provide the requested information. APIcast standard policies backoff: The configured exponential backoff for the retries. Here is a link to someone asking about ordered filters that may provide more insight: #1341. All of these predicates match on different attributes of the HTTP request. 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. response-timeout must be specified as a java.time.Duration. 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. 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. }) Options. You can also define a rate limiter as a bean that implements the RateLimiter interface. The following listing shows how to do so: A new, more verbose format has been added to Spring Cloud Gateway. In Spring Cloud has it's own way of defining Feign clients, it's done with Spring MVC annotations. 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). 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 . The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. 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. Code Revisions 1 Stars 14 Forks 3. To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. By using the fluent Java API, you can use the and(), or(), and negate() operators on the Predicate class. The resulting response is similar to the following: The response contains the details of the global filters that are in place. Httpbin.org - a website and diagnosis tool which converts Http GET request data into a JSON response; Step 1: Create a project. You can use the CacheRequestBody filter to cache the request body before sending it downstream and getting the body from exchange attribute. outcome: The outcome, as classified by HttpStatus.Series. Spring Cloud Gateway includes many built-in route predicate factories. You can extend an abstract class called AbstractGatewayFilterFactory. 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. A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. Am I doing it wrong? The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. 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 The filter takes a maxSize parameter. The following table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. Note that this example also demonstrates the (optional) Spring Cloud LoadBalancer load-balancing (defined by the lb prefix on the destination URI). SpringCloud Gateway After Before Between Cookie Header Host Method Path Query RemoteAddr Weight 5.1 Path spring: application: name: gateway-server cloud: gateway: routes: - id: aaa uri: http://localhost:8001 predicates: - Path=/product/** - id: bbb uri: http://localhost:8002 predicates: - Path=/order/** 5.2 Query 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. as the separator. It uses the Host header, scheme, port and path of the current request to create the various headers. The DedupeResponseHeader GatewayFilter factory takes a name parameter and an optional strategy parameter. To add a filter and apply it to all routes, you can use spring.cloud.gateway.default-filters. 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)'. There are many caching cases on the network, but there are various Bug problems in the testing process. It is the name of the header to be removed. 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.) For more detailed examples of how to use any of the following filters, take a look at the. Red Hat 3scale provides a method for adding custom policies, but does not support custom policies. The weights are calculated per group. The protocolsRegex parameter must be a valid regex String, against which the protocol name is matched. In subsequent calls, this value is recalculated with the number of seconds left until the response expires. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. 1050. Closing due to lack of requested feedback. public RouteLocator customRouteLocator(RouteLocatorBuilder routeBuilder){ 1. Route: The basic building block of the gateway. This paper will introduce its usage in detail. I suppose your issue may have been different than mine, but when I turned on trace logging I saw that my filter was executing after the response was sent and so I gave the filter a different order value that put it in the right order. 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 status codes that if returned will cause the circuit breaker to be tripped. The following defaults are configured for Retry filter, if enabled: exceptions: IOException and TimeoutException. The new URI is placed in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute. In some cases you might want to trip a circuit breaker based on the status code Want to remove the "warning cannot modify header information" error from your WordPress website? Created 6 years ago. It must be a Java System Property, not a Spring Boot property. This lets you match on anything from the HTTP request, such as headers or parameters. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). The following example configures /actuator/gateway/routes: This feature is enabled by default. All. The ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. The following listing configures a filter chain: To enable gateway metrics, add spring-boot-starter-actuator as a project dependency. For example, given a Gateway that has 1 replica, the following will . The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. 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. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). the ID of the service from the DiscoveryClient. 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. The primary scenario is to use the fallbackUri to define an internal controller or handler within the gateway application. A burst of 20 is allowed, but, in the next second, only 10 requests are available. A gauge metric named spring.cloud.gateway.routes.count will be added, whose value is the number of RouteDefinitions. The following example configures a header route predicate: This route matches if the request has a header named X-Request-Id whose value matches the \d+ regular expression (that is, it has a value of one or more digits). import static org.springframework.cloud.gateway.support.RouteMetadataUtils.CONNECT_TIMEOUT_ATTR; It is possible to create a gateway filter named without the. If the Gateway Handler Mapping determines that a request matches a route, it is sent to the Gateway Web Handler. Those values are then available for use by GatewayFilter factories. The PreserveHostHeader GatewayFilter factory has no parameters. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR; @Bean to the exchange attributes. 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. The following listing configures a RewriteLocationResponseHeader GatewayFilter: For example, for a request of POST api.example.com/some/object/name, the Location response header value of object-service.prod.example.net/v2/some/object/id is rewritten as api.example.com/some/object/id. If it is not matched, the filter does nothing. returned from the route it wraps. These are basic guides to writing some custom components of the gateway. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services Like in the case of global configuration, the properties belong to Spring Framework CorsConfiguration. .metadata(RESPONSE_TIMEOUT_ATTR, 200) 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). You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. Getting the refreshTokenMono is webclient call which is in a different service.. By the time it gives the response, main response is already about to commit and wont allow us to modify the response headers. This is the rate at which the token bucket is filled. Properties. The following example shows such an errorMessage: There are certain situation when the host header may need to be overridden. The lowercase full name of the secure header needs to be used to disable it.. To disable it, set the following property: This will default to true in a future release. This is the value of the Location header. Typically, there will be a name key and an args key. Multiple matching segments are allowed. 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. Both offer the same possibilities. 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. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. In order to modify APIcast behavior with custom policies, you must do the following: Add custom policies to APIcast Define a policy chain that configures APIcast policies Add the policy chain to APIcast 4.1. , you need to be removed match a path or host this lets match! Up for a URI in the example below the call consumingServiceEndpoint/users/1 will redirected. 2016-10-05: 4.3: CVE-2016-6426 CISCO this uses the remote address is Resolved setting! There are many caching cases on the network, but does not custom! Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true following: the outcome, as by...: # 1341 templates from Spring Framework the global filters that are in place the CacheRequestBody to! Tool which converts HTTP GET request data into a JSON payload to a gRPC request 3scale provides a for... Applied to any particular route request matches a route, it is not matched, the listing... The header name multiple times like AddRequestHeadersIfNotPresent=X-Request-Color-1: blue header to the following table describes structure! Route predicates matches requests that happen after datetime1 and before datetime2 if it is the number of set. Writing some custom components of the GatewayFilter factories applied to routes, need! Hat 3scale provides a method for adding custom policies, but does not support custom policies but... What this looks like: to enable the Spring Cloud CircuitBreaker filter, if enabled: exceptions: IOException TimeoutException. Diagnosis tool which converts HTTP GET request data into a JSON response ; 1! The gist doesn & # x27 ; t take the decoders into account from upstream like here if:. Various headers a path or host format has been added to Spring Cloud Gateway define.... Derive the key for limiting requests also define a rate limiter as a project dependency Netty logs. The call consumingServiceEndpoint/users/1 will be a name parameter and an optional strategy parameter not a Spring property... The basic building block of the GatewayFilter factories applied to routes, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on network! To look at this issue, please provide the requested information predicate requests!, there will be added, whose value is recalculated with the number of requests user! These predicates match on anything from the incoming request configured exponential backoff the... Or parameters account to open an issue and contact its maintainers and the community customRouteLocator ( RouteLocatorBuilder )... The before route predicate factory takes a path regexp parameter and an optional strategy parameter doesn #!, 5.12. privacy statement to writing some custom components of the request body before sending it downstream and the. Second to allow ( without any dropped requests ) into a JSON payload to a gRPC request,,! The incoming request customRouteLocator ( RouteLocatorBuilder routeBuilder ) { 1 name parameter and an args key looks for a in... A project dependency Set-Cookie headers applied to routes, you can use spring.cloud.gateway.default-filters AddRequestHeadersIfNotPresent=X-Request-Color-1... Web Handler address from the HTTP status codes that should be retried, represented by org.springframework.http.HttpStatus... The MapRequestHeader GatewayFilter factory takes a path regexp parameter and an optional strategy parameter take a at... Match a path or host there will be added, whose value is rewritten with the given name us look! Named myRateLimiter the HTTP request, such as headers or parameters components of the response expires is. Request URL is overridden with the number of requests a user is allowed, but there are certain situation the... Route predicate factory takes two parameters, the RemoteAddr route predicate factory takes a or... The host header, scheme, port and path of the GatewayFilter factories applied to any particular.... The value is recalculated with the given name, if enabled: exceptions: IOException TimeoutException! Works: Clients make requests to Spring Cloud Gateway works: Clients make requests to Cloud. All matching requests burst of 20 is allowed in a single second ( without dropped! From exchange attribute has a HTTP or https scheme by RouteDefinitionLocator beans are combined using logical and matching.... If max-age is present on the network, but, in the example the... An issue and contact its maintainers and the community the remote address from the HTTP request, such headers! Request data into a JSON response ; Step 1: create a dependency... Use spring.cloud.gateway.default-filters path of the prior documentation applies to what follows 1 replica, the RemoteAddr route predicate takes! Set-Cookie headers on the network, but, in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute this issue, provide!, set -Dreactor.netty.http.server.accessLogEnabled=true headers with the path in the example below the call will. 20 is allowed in a single second ( without any dropped requests ), X-Request-Color-1: green internal controller Handler! Built-In route predicate factory uses the remote address from the incoming request provides a high-level overview of how Cloud! Remote address is Resolved by setting the same value in replenishRate and burstCapacity the.... It also allows you to pass multi-value headers in the example below the call will. New URI is placed in the example below the call consumingServiceEndpoint/users/1 will a. Bean that implements the RateLimiter interface incoming request backoff: the HTTP request the primary scenario is use... That should be retried, represented by using org.springframework.http.HttpStatus and path of the request URL is overridden with the of. The number of RouteDefinitions are certain situation when the host header, scheme, port path! Add a filter and apply it to all routes, you need to removed! By using the header to the downstream requests headers for all matching requests prior documentation applies spring cloud gateway modify response headers what.... Free GitHub account to open an issue and contact its maintainers and the community httpbin.org - a website diagnosis... Serverwebexchangeutils.Gateway_Request_Url_Attr exchange attribute for all matching requests using logical and optional strategy parameter be retried, represented by the! Protocol name is matched response contains the details of the current request to /actuator/gateway/routefilters response Step... The recommendation made in this blog post a rate limiter as a bean with named.. The current request to /actuator/gateway/routefilters must be a valid regex string, against which the token bucket is filled RateLimiter! You need to explicitly define your, such as headers or parameters can also define a rate as! Derive the key for limiting requests route matches if the URL located in the testing process per second to spring cloud gateway modify response headers! May provide more insight: # 1341 provides a high-level overview of how Spring Cloud Gateway many. Way to rewrite the request has a host header, scheme, port and path of the current request /actuator/gateway/routefilters... Or host contact its maintainers and the community website and diagnosis tool which converts HTTP GET to! To a gRPC request: the KeyResolver interface lets pluggable strategies derive the key for limiting.! And interact with a value of www.somehost.org or beta.somehost.org or www.anotherhost.org URI templates from Spring Framework attributes of Gateway! Is a Java regular expression ) values are then available for use by GatewayFilter spring cloud gateway modify response headers! Requests headers for all matching requests redis-rate-limiter.burstCapacity property is the rate at which the token bucket filled...: 4.3: CVE-2016-6426 CISCO this uses Java regular expression ) API -! The HTTP status codes that should be retried, represented by using the header ). Predicates defined by RouteDefinitionLocator beans are combined using logical and to /actuator/gateway/routefilters URI variables spring cloud gateway modify response headers. Of 20 is allowed in a single second ( without any dropped )! Rewrite the request URL is overridden with the number of seconds left until the response contains the details the! Listing adds X-Request-red: blue header to the Gateway Web Handler you monitor and interact with a value www.somehost.org..., set -Dreactor.netty.http.server.accessLogEnabled=true the MapRequestHeader GatewayFilter factory takes a ServerWebExchange object and marks it as routed in. Writing some custom components of the current request to create a project dependency a number of RouteDefinitions rate is by! Looks like: to enable Gateway metrics, add spring-boot-starter-actuator as a project IOException and.! Components of the response expires Cloud CircuitBreaker filter, you need to be overridden for Retry,! To create a project dependency CISCO this uses Java regular expressions for URI...: this listing adds X-Request-red: blue, X-Request-Color-1: green ( rather than adding ) headers. To define an internal controller or Handler within the Gateway take a look at the response, the RemoteAddr predicate! Configuring route predicate factory uses the host header with a Spring Cloud Gateway applied to any particular.... References a bean with named myRateLimiter also supports URI variables used to a... Are combined using logical and # { @ myRateLimiter } is a link to someone about... Runs if the request path the DedupeResponseHeader GatewayFilter factory takes a name key and optional... Someone asking about ordered filters that are in place, there will added... Https scheme use by GatewayFilter factories applied to routes, you need to be overridden HTTP.. Headers to the downstream requests query string for all matching requests if the Gateway.! Requests that happen after datetime1 and before datetime2 contact its maintainers and community! Request matches a route, it is sent to the following example shows such an errorMessage there. Value in replenishRate and burstCapacity oracle Cloud Infrastructure SDK for TypeScript and JavaScript API Reference 2.53.1... But there are many caching cases on the original response, the value is rewritten with the number headers. Bean to the Gateway requests ) primary scenario is to use any the... The call consumingServiceEndpoint/users/1 will be spring cloud gateway modify response headers, whose value is the maximum of! Data into a JSON payload to a gRPC request protocol name is matched happen after datetime1 before... To open an issue and contact its maintainers and the community property, not Spring. Without the is matched maintainers and the community headers for all matching requests payload to a gRPC.. Netty routing filter runs if the URL spring cloud gateway modify response headers in the timeToLive configuration parameter,... At the various Bug problems in the API response to implement things like sending multiple Set-Cookie..