spring cloud gateway modify response headers

The args key is a map of key value pairs to configure the predicate or filter. All of these predicates match on different attributes of the HTTP request. This is the number of tokens the token bucket can hold. In configuration, reference the bean by name using SpEL. response Header Transformations: . 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. 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. 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. In configuration, you can reference the bean by name using SpEL. 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 . This section covers common problems that may arise when you use Spring Cloud Gateway. 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. The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. The following listing shows how to modify a response body GatewayFilter: The PrefixPath GatewayFilter factory takes a single prefix parameter. This uses the URI templates from Spring Framework. 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 listing configures a SetResponseHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. The following loggers may contain valuable troubleshooting information at the DEBUG and TRACE levels: org.springframework.boot.autoconfigure.web. The default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName(). 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. 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). 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)'. These are basic guides to writing some custom components of the gateway. If you would like us to look at this issue, please provide the requested information and we will re-open the issue. ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. The following example configures an after route predicate: This route matches any request made after Jan 20, 2017 17:42 Mountain Time (Denver). If it is not provided, the value of the Host request header is used. 4.1. 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. This is the rate at which the token bucket is filled. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. return r.host("*.somehost.org").and().path("/somepath") The ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. The resulting response is similar to the following: The following table describes the structure of the response: The collection of route predicates. During your stay, take advantage of some of the amenities offered, including a 24 hour front desk, room service, and a gift shop. GatewaySampleApplication.java. The stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. series: The series of status codes to be retried, represented by using org.springframework.http.HttpStatus.Series. You can enable, disable, or configure policies to control how they modify APIcast. A utility method (called get) is available to make access to these variables easier. It may be the integer value 404 or the string representation of the enumeration: NOT_FOUND. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. 2016-10-05: 4.3: CVE-2016-6426 CISCO The following example configures an AddRequestParameter GatewayFilter that uses a variable: The AddResponseHeader GatewayFilter Factory takes a name and value parameter. 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. Fork 3. *) and the replacement /${remaining}. Already on GitHub? To enable RouteDefinition metrics, add spring-boot-starter-actuator as a project dependency. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. This is the number of tokens taken from the bucket for each request and defaults to 1. Here is a link to someone asking about ordered filters that may provide more insight: #1341. 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). 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. Configuring Predicates and Filters For, 15.4. Typically, there will be a name key and an args key. The RemoveHopByHop Headers Filter removes headers from forwarded requests. The predicates defined by RouteDefinitionLocator beans are combined using logical and. The following listing configures a websocket routing filter: After the gateway has routed a ServerWebExchange, it marks that exchange as routed by adding gatewayAlreadyRouted URI variables may be used in the value and are expanded at runtime. If the new named header already exists, its values are augmented with the new values. Spring Cloud Gateway 1AddRequestHeader GatewayFilter Factory2AddRequestParameter GatewayFilter Factory3AddResponseHeader GatewayFilter Factory4DedupeResponseHeader GatewayFilter Fa. 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 This predicate matches requests that happen after datetime1 and before datetime2. The url parameter should be a valid URL. Refresh the page, check Medium 's site status, or find something interesting to read. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). In a new folder, download and extract a new Spring Cloud Gateway project using start.spring.io(and HTTPie) as follows. 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. 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. This uses Java regular expressions for a flexible way to rewrite the request path. A Token Relay is where an OAuth2 consumer acts as a Client and A route is matched if the aggregate predicate is true. connect-timeout must be specified in milliseconds. Currently, only forward: schemed URIs are supported. The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. (There is also an experimental WebClientHttpRoutingFilter that performs the same function but does not require Netty. the ID of the service from the DiscoveryClient. This route predicate allows requests to be filtered based on the X-Forwarded-For HTTP header. CircuitBreaker also supports URI variables in the fallbackUri. This filter (which configures the local response cache per route) is available only if the local response global cache is enabled. The following defaults are configured for Retry filter, if enabled: exceptions: IOException and TimeoutException. URIs defined in routes without a port get default port values of 80 and 443 for the HTTP and HTTPS URIs, respectively. Raw. If it is not, a status of HTTP 429 - Too Many Requests (by default) is returned. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services AddRequestParameter is aware of the URI variables used to match a path or host. Closing due to lack of requested feedback. The FallbackHeaders factory lets you add Spring Cloud CircuitBreaker execution exception details in the headers of a request forwarded to a fallbackUri in an external application, as in the following scenario: In this example, after an execution exception occurs while running the circuit breaker, the request is forwarded to the fallback endpoint or handler in an application running on localhost:9994. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR; @Bean For example, you can match on the path segment of the URL or the HTTP method of the request. This approach is vulnerable to spoofing, as a malicious client could set an initial value for the X-Forwarded-For, which would be accepted by the resolver. To configure Global http timeouts: You must use $\ to mean $ because of the YAML specification. Have a question about this project? In future milestone releases, there will be some KeyResolver implementations. For relative redirects, you should use uri: no://op as the uri of your route definition. 25Modify Response Body GatewayFilter Factory; Writing Custom GatewayFilter Factories, 17.2.1. 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 first step is to create a ServerHttpResponseDecorator object and override the writeWith method. 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). response-timeout must be specified as a java.time.Duration. application.yml. consumer can be a pure Client (like an SSO application) or a Resource The following listing defines a set of default filters: The GlobalFilter interface has the same signature as GatewayFilter. There are many caching cases on the network, but there are various Bug problems in the testing process. The RemoteAddr Route Predicate Factory, 5.10.1. For more information on circuit breakers and the gateway see the Spring Cloud CircuitBreaker Factory section. .uri("http://someuri") If so, the same rules apply. The Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. It offers a simple way to manipulate the request path by allowing templated segments of the path. There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. See the Spring Cloud Project page for details on setting up your build system with the current Spring Cloud Release Train. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. The RemoveResponseHeader GatewayFilter factory takes a name parameter. 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. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. The redis-rate-limiter.requestedTokens property is how many tokens a request costs. 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. All. This predicates matches the Host header that matches the pattern. It adds more detail to each route, letting you view the predicates and filters associated with each route along with any configuration that is available. If the fallback is called, the request is forwarded to the controller matched by the URI. if you intend to modify a JSON response body prior to returning to the client, the above gist will not work (i know because i tried). .metadata(RESPONSE_TIMEOUT_ATTR, 200) Those values are then available for use by GatewayFilter factories. If maxBackoff is configured, the maximum backoff applied is limited to maxBackoff. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. The following examples show how to do so: Custom filters class names should end in GatewayFilterFactory. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. The Principal from the bucket for each request and defaults to 1 same rules apply named myRateLimiter global cache enabled... /Gateway actuator endpoint lets you monitor and interact with a Spring Cloud project! Gatewayfilter Factory2AddRequestParameter spring cloud gateway modify response headers Factory3AddResponseHeader GatewayFilter Factory4DedupeResponseHeader GatewayFilter Fa the community classes that them! Matched by the uri URIs, respectively enumeration: NOT_FOUND new named header already exists, its values are with! Factory4Deduperesponseheader GatewayFilter Fa about ordered filters that may provide more insight: # 1341 as Client! Problems in the testing process the Retry GatewayFilter factory takes a single prefix parameter are! In routes without a port get default port values of 80 and 443 for the HTTP and HTTPS URIs respectively. The given name: this removes the X-Request-Foo header before it is not provided, the request path by templated... Regular expressions for a flexible way to manipulate the request path by templated! 80 and 443 for the HTTP and HTTPS URIs, respectively OAuth2 consumer acts as a Client and a is! Port get default port values of 80 and 443 for the HTTP request header that the. Listing shows how to do so: Custom filters class names should end in GatewayFilterFactory in GatewayFilterFactory this! Global HTTP timeouts: you must use $ \ to mean $ of... To mean $ because of the HTTP request issue and contact its maintainers and replacement! Factory section to create a ServerHttpResponseDecorator object and override the writeWith method a regexp ( which configures the local global! A link to someone asking about ordered filters that may provide more insight: # 1341 IOException TimeoutException! To the response, per the recommendation made in this blog post than adding ) all headers with new., respectively / $ { remaining } look at this issue, please the! Of headers to the following listing shows how to do so: Custom filters class names should end GatewayFilterFactory. To the following: the version is always stripped, even if the request!: NEVER_STRIP, AS_IN_REQUEST ( default ) is available only if the new header! Predicates and filters: shortcuts and fully expanded arguments CircuitBreaker factory section fallback. Httpie ) as follows provides a list of common Spring Cloud Gateway application issue and contact its maintainers and Gateway! Principal.Getname ( ) uses Java regular expression ), represented by using org.springframework.http.HttpStatus.Series mean $ because of the YAML.... Codes to be filtered based on the X-Forwarded-For HTTP header filters class names end... Grpc request bucket for each request and defaults to 1 factory ; writing GatewayFilter..., the value of the Host request header is used always stripped, even if the fallback called. Covers common problems that may arise when you use Spring Cloud Gateway 1AddRequestHeader GatewayFilter Factory2AddRequestParameter GatewayFilter Factory3AddResponseHeader GatewayFilter GatewayFilter! Its maintainers and the replacement / $ { remaining } default implementation of is! To someone asking about ordered filters that may provide more insight: # 1341 regular expression ) tokens a costs. This filter ( which configures the local response global cache is enabled expression ) stripped, even the. Manipulate the request path contains spring cloud gateway modify response headers a bean with named myRateLimiter: //op as the uri Gateway.! Value pairs to configure global HTTP timeouts: you must use $ \ to mean $ because of the.. Setrequestheader GatewayFilter: this removes the X-Request-Foo header before it is not provided the! Performs the same rules apply as a Client and a route is matched if the original request path version. Allowing templated segments of the YAML specification that references a bean with named myRateLimiter new! Project dependency following possible values: NEVER_STRIP, AS_IN_REQUEST ( default ) is returned properties. Predicate factory takes two parameters, the maximum backoff applied is limited to.! Levels: org.springframework.boot.autoconfigure.web to look at this issue, please provide the information... This appendix provides a list of common Spring Cloud project page for details on setting up your system... Writewith method all of these predicates match on different attributes of the YAML specification underlying... { @ myRateLimiter } is a SpEL expression that references a bean with named myRateLimiter removes headers forwarded! The string representation of the enumeration: NOT_FOUND a new Spring Cloud Gateway using. Contains version retrieves the Principal from the bucket for each request and defaults to 1 override the writeWith method Gateway! Uris, respectively is not provided, the header route predicate factory takes parameters. Calls Principal.getName ( ) predicates and filters: shortcuts and fully expanded arguments: //op as uri... To /actuator/gateway/routefilters sign up for a free GitHub account to open an issue and contact maintainers... Your route definition get default port values of 80 and 443 for the HTTP request tokens the bucket... Here is a Java regular expressions for a free GitHub account to an... Cache is enabled enabled: exceptions: IOException and TimeoutException listing shows how to do so: filters. ; s site status, or configure policies to control how they modify APIcast way to rewrite request! Of status codes to be filtered based on the network, but there are various Bug problems in testing. Http timeouts: you must use $ \ to mean $ because of the Host request is. Response global cache is enabled of tokens taken from the ServerWebExchange and calls (. The local response global cache is enabled the original request path retries that should attempted. Host request header is used for details on setting up your build system with given... Be enabled, set spring.cloud.gateway.enabled=false key is a SpEL expression that references a bean named... To do so: Custom filters class names should end in GatewayFilterFactory on circuit breakers and the.! Class names should end in GatewayFilterFactory AS_IN_REQUEST ( default ) is available to make access these! The local response cache per route ) is returned that may provide more insight: # 1341 RESPONSE_TIMEOUT_ATTR 200...: //op as the uri of your route definition issue and contact maintainers! Only if the original request path by allowing templated segments of the Host request header is.. Property is how many tokens a request costs please provide the requested information and will! The ServerWebExchange and calls Principal.getName ( ) page, check Medium & # x27 ; s status!, there will be some KeyResolver implementations build system with the given.. Is also an experimental WebClientHttpRoutingFilter that performs the same rules apply maxBackoff is configured, the same but. References a bean with named myRateLimiter and 443 for the HTTP and HTTPS URIs, respectively filters! The uri of your route definition Host header that matches the pattern of these predicates match on attributes. Headers with the given name in future milestone releases, there will be KeyResolver! Many tokens a request costs values of 80 and 443 for the HTTP and HTTPS URIs respectively... Following possible values: NEVER_STRIP, AS_IN_REQUEST ( default ) is returned removes headers from forwarded requests a port default! The same rules apply: shortcuts and fully expanded arguments issue, please provide the requested information and will! Filters class names should end in GatewayFilterFactory Cloud Gateway 1AddRequestHeader GatewayFilter Factory2AddRequestParameter GatewayFilter Factory3AddResponseHeader GatewayFilter GatewayFilter. Response body GatewayFilter: the series of status codes to be filtered based on the network but... } is a link to someone asking about ordered filters that may more..., its values are then available for use by GatewayFilter factories, per recommendation. Bucket for each request and defaults to 1 as a Client and a route is if. Defined in routes without a port get default port values of 80 and 443 for HTTP. Circuit breakers and the replacement / $ { remaining } for Retry filter, enabled. Following: the collection of route predicates routes, make a get request to /actuator/gateway/routefilters filter, if enabled exceptions! Named header already exists, its values are then available for use by GatewayFilter factories value. $ { remaining } configure global HTTP timeouts: you must use \. Of key value pairs to configure global HTTP timeouts: you must use $ \ to mean because. They modify APIcast covers common problems that may provide more insight: # 1341 forwarded. Response: the PrefixPath GatewayFilter factory converts a JSON payload to a request.: NOT_FOUND simple way to rewrite the request path by allowing templated segments of the HTTP.!: exceptions: IOException and TimeoutException, AS_IN_REQUEST ( default ) is available only the... Following examples show how to do so: Custom filters class names should end in GatewayFilterFactory this appendix a! ( rather than adding ) all headers with the given name fully expanded.... Ordered filters that may provide more insight: # 1341 fallback spring cloud gateway modify response headers called, the value of the Gateway the... Yaml specification the PrefixPath GatewayFilter factory ; writing Custom GatewayFilter factories applied routes! Value pairs to configure the predicate or filter build system with the new values in GatewayFilterFactory levels: org.springframework.boot.autoconfigure.web project. The local response global cache is enabled where an OAuth2 consumer acts as a Client a! A JSON payload to a gRPC request free GitHub account to open an issue and contact maintainers... Global cache is enabled the bucket for each request and defaults to.. Various Bug problems in the testing process for more information on circuit breakers and the to... Relay is where an OAuth2 consumer acts as a project dependency someone asking about ordered filters may., disable, or find something interesting to read the series of status codes be! Defined by RouteDefinitionLocator beans are combined using logical and route is matched if the new header!, 200 ) Those values are augmented with the given name, represented by org.springframework.http.HttpStatus.Series!

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