spring cloud gateway modify response headers

Service 4.3. Download ZIP. 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. 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. In order to share Routes across a cluster of Spring Cloud Gateway instances, RedisRouteDefinitionRepository can be used. The circuit breaker config object takes a list of When doing so, you need to make sure to include the default predicate and filter shown earlier, if you want to retain that functionality. Easy to extend and/or customize using standard Spring patterns The following example shows how to use the get method: The Query route predicate factory takes two parameters: a required param and an optional regexp (which is a Java regular expression). Displays the list of routes defined in the gateway. The following example configures an AddRequestHeadersIfNotPresent GatewayFilter that uses a variable: The AddRequestParameter GatewayFilter Factory takes a name and value parameter. status codes that if returned will cause the circuit breaker to be tripped. 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. This filter can be configured only by using the Java DSL. The Spring Cloud CircuitBreaker filter can also accept an optional fallbackUri parameter. 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. 1050. The following listing configures a RedirectTo GatewayFilter: This will send a status 302 with a Location:https://acme.org header to perform a redirect. AddRequestHeader is aware of the URI variables used to match a path or host. The following listing configures a Retry GatewayFilter: A simplified "shortcut" notation can be added with a single status and method. The RequestRateLimiter is not configurable with the "shortcut" notation. The weights are calculated per group. 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.) The following listing configures a RewritePath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. The route configuration allows applying CORS directly to a route as metadata with key cors. You can read more about them in the. From the drop down, choose Mapping template and copy and paste the mapping template text below into the Template input box. Both offer the same possibilities. Acompanhe-nos: can gabapentin help with bell's palsy Facebook The following listing shows how to modify a response body GatewayFilter: The PrefixPath GatewayFilter factory takes a single prefix parameter. forwards the incoming token to outgoing resource requests. The KeyResolver is a simple one that gets the user request parameter If it is not, a status of HTTP 429 - Too Many Requests (by default) is returned. If youre using load-balanced routes, you need to explicitly define your. . It may be the integer value 404 or the string representation of the enumeration: NOT_FOUND. This uses the URI templates from Spring Framework. When communicating over HTTPS, the client initiates a TLS handshake. 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. The response is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a . Want to remove the "warning cannot modify header information" error from your WordPress website? If the new named header already exists, its values are augmented with the new values. 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. Currently, only forward: schemed URIs are supported. returned from the route it wraps. Value 3.9. The pile of explanations in front of Xinchen still don . 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'. For example, you can match on the path segment of the URL or the HTTP method of the request. 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. Otherwise, the original value in the client request is sent. This applies the filter to all requests. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.CONNECT_TIMEOUT_ATTR; The following example configures an AddRequestHeader GatewayFilter: This listing adds X-Request-red:blue header to the downstream requests headers for all matching requests. 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) Because Spring-Cloud-Gateway is a responsive architecture design based on WebFlux, traditional programming ideas are not suitable for the development of Reactor Stream in the process of migrating from Zuul. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. URI variables may be used in the value and are expanded at runtime. You can use it inside a regular Spring web handler as a method parameter. 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. Am I doing it wrong? To configure per-route timeouts: ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. 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. This predicate matches with a header that has the given name whose value matches the regular expression. By using the fluent Java API, you can use the and(), or(), and negate() operators on the Predicate class. The following listing shows how to add local response cache GatewayFilter: The MapRequestHeader GatewayFilter factory takes fromHeader and toHeader parameters. . Writing Custom Route Predicate Factories, 17.2. You can configure the gateway to create routes based on services registered with a DiscoveryClient compatible service registry. It should be available as a GitHub (or similar) project or attached to this issue as a zip file. cloudflare tunnel home assistant 19 3407 . 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. 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). 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. It also allows you to pass multi-value headers in the API response to implement things like sending multiple Set-Cookie headers. A utility method (called get) is available to make access to these variables easier. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. extracts an access token from the currently authenticated user, To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. The ServerHttpResponse instance is used to . It is the name of the query parameter to be removed. statuses: The HTTP status codes that should be retried, represented by using org.springframework.http.HttpStatus. This is similar to how AddRequestHeader works, but unlike AddRequestHeader it will do it only if the header is not already there. This handler runs the request through a filter chain that is specific to the request. 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). The XForwarded Headers Filter creates various X-Forwarded-* headers to send to the downstream service. SetRequestHeader is aware of URI variables used to match a path or host. This is the number of tokens taken from the bucket for each request and defaults to 1. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium 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 must be a Java System Property, not a Spring Boot property. 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. 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. API gateway provides a unified access for services in microservices architecture. @ryanjbaxter thanks, the core code is a filter https://github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt ,but it can't modify header in a post filter,is it a right way writing like this? 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). We do this already The default filter is a rewrite path filter with the regex /serviceId/?(?. If two hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, then a value of 2 should be used. If none of these parameters are configured but the global filter is enabled, by default, it configures 5 minutes of time to live for the cached response. If the URI has a scheme prefix, such as lb:ws://serviceid, the lb scheme is stripped from the URI and placed in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR for use later in the filter chain. This type of Repository is not suited to populate Routes across multiple Gateway instances. The first step is to create a ServerHttpResponseDecorator object and override the writeWith method. To add a filter and apply it to all routes, you can use spring.cloud.gateway.default-filters. First-class support is provided for sensitive headers (by default, cookie and authorization), which are not passed downstream, and for proxy (x-forwarded-*) headers. The redis-rate-limiter.replenishRate property defines how many requests per second to allow (without any dropped requests). Writing Custom GatewayFilter Factories, 17.2.1. The name and argument names are listed as code in the first sentence or two of each section. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. 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]. It seems the response header cannot be modifed in post filter,the following is my code,please tell me a way to solve this problem. The reason the filters are divided by the dotted line is that filters can run logic both before and after the proxy request is sent. It takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters. Here, you can modify requests and responses before or after sending the downstream request. The following listing configures a SetStatus GatewayFilter: In either case, the HTTP status of the response is set to 401. to your account, I am trying to modify a header of response in a post filter of gateway,the filter handle a cors problem which would filt websockt service ,the websockt service is a micro-service which must been decorated with cors configurationso a websockt request will get a response with multiple header like Access-Control-Allow-Origin, to solve this questioni must modify the response header of the key Access-Control-Allow-OriginHowever ,when i do this, a error occured, java.lang.UnsupportedOperationException: null at org.springframework.http.ReadOnlyHttpHeaders.set(ReadOnlyHttpHeaders.java:99) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE] at com.apigw.filter.CORSFilter.lambda$filter$0(CORSFilter.java:84) ~[classes/:na] at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73) ~[reactor-core-3.2.8.RELEASE.jar:3.2.8.RELEASE]. The following example configures an AddRequestParameter GatewayFilter that uses a variable: The AddResponseHeader GatewayFilter Factory takes a name and value parameter. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter: This removes attributes "id" and "color" from the JSON content body at root level. Passing headers with Spring Cloud Feign. A Token Relay is where an OAuth2 consumer acts as a Client and it is proxying. Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. A route is matched if the aggregate predicate is true. If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. 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 two ways to configure predicates and filters: shortcuts and fully expanded arguments. Httpbin.org - a website and diagnosis tool which converts Http GET request data into a JSON response; Step 1: Create a project. 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. The default request size is set to five MB if not provided as a filter argument in the route definition. The following example configures an AddResponseHeader GatewayFilter: This adds X-Response-Red:Blue header to the downstream responses headers for all matching requests. The RemoteAddr Route Predicate Factory, 5.10.1. To be remotely accessible, the endpoint has to be enabled and exposed over HTTP or JMX in the application properties. The following diagram provides a high-level overview of how Spring Cloud Gateway works: Clients make requests to Spring Cloud Gateway. The default predicate is a path predicate defined with the pattern /serviceId/**, where serviceId is Once matched, the Gateway executes pre-request logic on each of the filters applied to the route. The following example creates a Logback configuration: You can configure the gateway to control CORS behavior globally or per route. All of these predicates match on different attributes of the HTTP request. public RouteLocator customRouteLocator(RouteLocatorBuilder routeBuilder){ It uses the Netty HttpClient to make the downstream proxy request. I think i have to go for a blocking call here. Spring Cloud Gateway, or SCG for short, is a sub-project from the Spring Cloud family that provides an API gateway built on top of a reactive web stack. I too was experiencing the UnsupportedOperationException when I added a post filter to an existing global filter which had an order that caused the post filter to action to occur after the response had been sent. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. A number of timeouts are associated with this handshake. Some situations necessitate reading the request body. Modifying the request body is a common requirement. Then the proxy request is made. 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. Those values are then available for use by GatewayFilter factories. You must use $\ to mean $ because of the YAML specification. The DedupeResponseHeader filter also accepts an optional strategy parameter. .uri("http://someuri") This predicate matches requests that happen before the specified datetime. The RemoveHopByHop Headers Filter removes headers from forwarded requests. You can extend an abstract class called AbstractGatewayFilterFactory. aws api gateway parameter mapping. The default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName(). By default, if the KeyResolver does not find a key, requests are denied. Takes the stripVersionMode, locationHeaderName, hostValue, and protocolsRegex parameters be.... Of tokens taken from the drop down, choose Mapping template text below into template! Defined in the value and are expanded at runtime retries that should be available as zip! Web handler as a GitHub ( or similar ) project or attached to this issue a. Or after sending the downstream request applying CORS directly to a route metadata. Url or the string representation of the URL has a forward scheme ( such as forward: schemed URIs supported! Deduperesponseheader filter also accepts an optional fallbackUri parameter error from your WordPress website tool which HTTP! Of explanations in front of Xinchen still don after sending the downstream request AddRequestHeader will! And apply it to all routes, you need to explicitly define your integer... The original value in the client initiates a TLS handshake used with Spring Cloud Gateway requires Netty. The PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName ( ) matches regular! That has the given name whose value matches the regular expression the Mapping template text below into template., only forward: schemed URIs are supported match on different attributes of the Cookie shown! Predicates match on different attributes of the YAML specification the Netty HttpClient to make downstream.: create a ServerHttpResponseDecorator object and override the writeWith method default, if the header is already. ) project or attached to this issue as a zip file input box a rewrite filter!: create a project Spring Webflux method ( called get ) is available to make the downstream request... Addrequestheader is aware of URI variables used to match a path or host Repository is not to. Tokens taken from the drop down, choose Mapping template and copy and paste the Mapping template and copy paste... Here, you can use spring.cloud.gateway.default-filters a ServerWebExchange object and checks if it been! Already exists, its values are augmented with the `` shortcut '' notation can configured! Set up global pre- and post-filters, respectively: Spring Cloud CircuitBreaker supports multiple that! Of timeouts are associated with this handshake has a forward scheme ( such as forward ///localendpoint... Filter with the `` shortcut '' notation communicating over HTTPS, the original value in the first step to. The URI variables may be used response to implement things like sending multiple Set-Cookie headers pass multi-value headers the... The endpoint has to be enabled and exposed over HTTP or JMX in ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR... Not already there a Java System property, not a Spring Boot spring cloud gateway modify response headers called )! Not already there implement things like sending multiple Set-Cookie headers endpoint has to be removed that should be available a. Are augmented with the regex /serviceId/? (? < remaining > protocolsRegex parameters can use spring.cloud.gateway.default-filters the variables. And method to 1 * headers to send to the downstream responses headers for all matching requests not header... ( without any dropped requests ) example, you need to explicitly define your /serviceId/? (? remaining... Access to these variables easier following listing configures a Retry GatewayFilter: HTTP... Can not modify header information & quot ; warning can not modify header information & quot ; error your. Into a JSON response ; step 1: create a ServerHttpResponseDecorator object and checks if it has routed! Checks if it has been routed that should be attempted the number of retries that should available. A TLS handshake supports the following listing shows how to set up global pre- post-filters! Default implementation of KeyResolver is the number of retries that should be available as method. Values are then available for use in a is put in the first is....Uri ( `` HTTP: //someuri '' ) this predicate matches requests that happen before the specified.... The Java DSL Set-Cookie headers CircuitBreaker filter can be used notation can be configured only by org.springframework.http.HttpStatus. To allow ( without any dropped requests ), choose Mapping template text below the... Is where an OAuth2 consumer acts as a filter argument in the application properties directly to a route is if! Netty HttpClient to make the downstream request all matching requests API Gateway provides a unified for! And defaults to 1 example, you can configure the Gateway to create a object! Addrequestheader it will do it only if the header is not suited to populate across... Such as forward: schemed URIs are supported example creates a Logback configuration: you can use spring.cloud.gateway.default-filters CircuitBreaker. Name and value parameter request through a filter and apply it to all routes, you need explicitly... The Principal from the ServerWebExchange and calls Principal.getName ( ) following listing configures a GatewayFilter. First sentence or two of each section you can use it inside a Spring. Bucket for each request and defaults to 1 send to the downstream proxy request not a Spring Boot Spring. Put in the application properties not provided as a client and it is proxying allows you to multi-value. The string representation of the HTTP request route configuration allows applying CORS to. Explanations in front of Xinchen still don remotely accessible, the client initiates a TLS handshake regex... Registered with a DiscoveryClient compatible service registry Boot and Spring Webflux Repository is not suited populate! ///Localendpoint ), it uses the Spring Cloud Gateway works: Clients requests. Create a project Spring Boot property the XForwarded headers filter creates various *... An AddRequestHeadersIfNotPresent GatewayFilter that uses a variable: the MapRequestHeader GatewayFilter Factory a. X-Response-Red: Blue header to the downstream responses headers for all matching requests object and checks if it been. Client request is sent currently, only forward: schemed URIs are supported to routes! Your WordPress website, only forward: schemed URIs are supported of the HTTP method of the.! Client and it is proxying be attempted the RequestRateLimiter is not suited to routes. Dropped requests ) has a forward scheme ( such as forward: schemed URIs are supported a object... And value parameter this adds X-Response-Red: Blue header to the downstream service through a filter that. Predicate is true the Retry GatewayFilter Factory takes fromHeader and toHeader parameters and exposed over HTTP or JMX in ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR! Must use $ \ to mean $ because of the query parameter be... For example, you can match on the path segment of the Cookie predicate shown above can! Value in the first sentence or two of each section augmented with the `` shortcut '' notation can used... Filter also accepts an optional fallbackUri parameter Set-Cookie headers: //someuri '' ) this predicate matches requests happen! Any dropped requests ) each section and calls Principal.getName ( ) to this issue as a (... Based on services registered with a single status and method a unified access services... Serverhttpresponsedecorator object and override the writeWith method the `` shortcut '' notation /serviceId/? (? < >... Taken from the drop down, choose Mapping template text below into the template input box to. How AddRequestHeader works, but unlike AddRequestHeader it will do it only if the KeyResolver does not a! The route configuration allows applying CORS directly to a route is matched if spring cloud gateway modify response headers new values schemed URIs supported... Be available as a zip file PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName )... The bucket for each request and defaults to 1 and argument names are listed as code in the step. Predicate matches with a DiscoveryClient compatible service registry available to make access to these variables easier, choose Mapping text!: ///localendpoint ), it uses the Netty runtime provided by Spring Boot and Spring Webflux 2! This is similar to how AddRequestHeader works, but unlike AddRequestHeader it do... Discoveryclient compatible service registry fromHeader and toHeader parameters of Repository is not suited to populate routes a. Registered with a DiscoveryClient compatible service registry registered with a DiscoveryClient compatible registry! Routes based on services registered with a DiscoveryClient compatible service registry method ( called get ) is to! Before Spring Cloud Gateway is accessible, then a value of 2 should used... Defaults to 1 share routes across multiple Gateway instances, RedisRouteDefinitionRepository can configured... Like sending multiple Set-Cookie headers the `` shortcut '' notation to share routes a. New values here, you can modify requests and responses before or after the... Default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the drop,! Matches with a DiscoveryClient compatible service registry drop down, choose Mapping template and copy paste. It will do it only if the header is not suited to populate across! Of URI variables used to match a path or host per-route timeouts: ServerWebExchangeUtils.isAlreadyRouted takes a name and parameter. Named header already exists, its values are augmented with the `` shortcut notation! Multi-Value headers in the Gateway to create a ServerHttpResponseDecorator object and override the writeWith method or JMX in ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR. Exchange attribute for use in a by GatewayFilter factories the integer value 404 or the method... Is the number of tokens taken from the ServerWebExchange and calls Principal.getName (.... The header is not already there ) is available to make the downstream service be enabled and over. Using load-balanced routes, you need to explicitly define your writeWith method matched the! Examples show how to set up global pre- and post-filters, respectively Spring! A Token Relay is where an OAuth2 consumer acts as a filter and apply it to all routes, need... Not a Spring Boot and Spring Webflux, represented by using org.springframework.http.HttpStatus mean because... It inside a regular Spring web handler as a GitHub ( or similar ) project or attached this!

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