spring cloud gateway modify response headers

The RequestHeaderSize GatewayFilter factory takes maxSize and errorHeaderName parameters. 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 Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. Displays information about a particular route. It offers a simple way to manipulate the request path by allowing templated segments of the path. the request should only be allowed if it comes from a trusted list of IP addresses used by those The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. All of these predicates match on different attributes of the HTTP request. 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) Any otherway is there apart from blocking call? It is defined by an ID, a destination URI, a collection of predicates, and a collection of filters. The following example configures an SetResponseHeader GatewayFilter that uses a variable: The SetStatus GatewayFilter factory takes a single parameter, status. 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.) 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. The RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the current request is allowed to proceed. A Token Relay is where an OAuth2 consumer acts as a Client and To configure Global http timeouts: The algorithm used is the Token Bucket Algorithm. The ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. Service 4.3. 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. This is the number of tokens taken from the bucket for each request and defaults to 1. 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. 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). InMemoryRouteDefinitionRepository which only lives within the memory of one Gateway instance. The following listing shows how it works: This style also allows for more custom predicate assertions. The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. The following example creates a Logback configuration: You can configure the gateway to control CORS behavior globally or per route. As a result, you can inject request headers and query parameters, for instance, and you can constrain the incoming requests with declarations in the mapping annotation. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR; @Bean Displays the list of GatewayFilter factories applied to a particular route. Those values are then available for use by GatewayFilter factories. 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 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 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. 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. For each factory there is a string representation of the corresponding object (for example, [[emailprotected] configClass = Object]). 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 Post global filters are usually used in spring cloud gateway to perform operations on response like adding some headers or modifying response body or response status etc. 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. The arguments are typically listed in the order that are needed for the shortcut configuration. When communicating over HTTPS, the client initiates a TLS handshake. Download ZIP. In some cases you might want to trip a circuit breaker based on the status code I think i have to go for a blocking call here. It uses the Netty HttpClient to make the downstream proxy request. It requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. 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. The default filter is a rewrite path filter with the regex /serviceId/?(?. A gauge metric named spring.cloud.gateway.routes.count will be added, whose value is the number of RouteDefinitions. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. In order to share Routes across a cluster of Spring Cloud Gateway instances, RedisRouteDefinitionRepository can be used. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). }) To enable the Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath. If so, the same rules apply. 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 Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchTrailingSlash (defaults to true). The RemoveRequestHeader GatewayFilter factory takes a name parameter. URI variables may be used in the value and are expanded at runtime. 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). The RemoveHopByHop Headers Filter removes headers from forwarded requests. The stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. pass the authentication token downstream to the services (in this case If the input header does not exist, the filter has no impact. The AddRequestHeader GatewayFilter factory takes a name and value parameter. To allow for simple configuration in Java, the RouteLocatorBuilder bean includes a fluent API. AddRequestParameter is aware of the URI variables used to match a path or host. These are basic guides to writing some custom components of the gateway. The following example configures /actuator/gateway/routes: This feature is enabled by default. Setting this value to zero blocks all requests. The following example below is invalid: The Redis implementation is based on work done at Stripe. The lowercase full name of the secure header needs to be used to disable it.. Code Revisions 1 Stars 14 Forks 3. The path part of the request URL is overridden with the path in the forward URL. Modifying the request body is a common requirement. The response is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a . Refresh the page, check Medium 's site status, or find something interesting to read. When a request is made through the gateway to /json/hello, the request is transformed by using the definition provided in hello.proto, sent to com.example.grpcserver.hello.HelloService/hello, and the response back is transformed to JSON. By default, it creates a NettyChannel by using the default TrustManagerFactory. The resulting response is similar to the following: The response contains the details of the GatewayFilter factories applied to any particular route. exceptions: A list of thrown exceptions that should be retried. 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). Sign in We've already covered its basic usage in earlier tutorials, so we won't get into those aspects here. The following listing shows the KeyResolver interface: The KeyResolver interface lets pluggable strategies derive the key for limiting requests. This filter also implements the automatic calculation of the max-age value in the HTTP Cache-Control header. The HTTP Cache-Control header allows caching (that means it does not have any of the following values: no-store present in the request and no-store or private present in the response). Spring Cloud Gateway includes many built-in route predicate factories. The resulting response is similar to the following: The response contains the details of the global filters that are in place. 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 Gateway is defined with a number of routes, each with Predicates to match the request to the route. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. AddRequestHeader is aware of the URI variables used to match a path or host. That is not a complete working sample, it is just some code. 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. In configuration, reference the bean by name using SpEL. The primary scenario is to use the fallbackUri to define an internal controller or handler within the gateway application. aws api gateway parameter mapping. For more detailed examples of how to use any of the following filters, take a look at the. You can overwrite the names of the headers in the configuration by setting the values of the following arguments (shown with their default values): executionExceptionTypeHeaderName ("Execution-Exception-Type"), executionExceptionMessageHeaderName ("Execution-Exception-Message"), rootCauseExceptionTypeHeaderName ("Root-Cause-Exception-Type"), rootCauseExceptionMessageHeaderName ("Root-Cause-Exception-Message"). 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. To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. Spring Cloud Gateway can forward OAuth2 access tokens downstream to the services The resulting response is similar to the following: The response contains the details of all the routes defined in the gateway. status codes that if returned will cause the circuit breaker to be tripped. Both offer the same possibilities. This predicate matches cookies that have the given name and whose values match the regular expression. There are convenience methods that you can use to mark an exchange as routed It can be used as API gateway in microservice architecture and supports dynamic routing and filtering functions. APIcast standard policies How to modify spring cloud gateway response headers, https://github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, 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. You can configure these timeouts can be configured (defaults shown) as follows: Configuration for Spring Cloud Gateway is driven by a collection of RouteDefinitionLocator instances. The following example configures a SetPath GatewayFilter: For a request path of /red/blue, this sets the path to /blue before making the downstream request. The predicates defined by RouteDefinitionLocator beans are combined using logical and. Then, by default, the gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled property is not set to false. privacy statement. 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). .application.yml. which are java ZonedDateTime objects. it is proxying. The following maxTrustedIndex values yield the following remote addresses: (invalid, IllegalArgumentException during initialization). .filters(f -> f.addRequestHeader("header1", "header-value-1")) 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. 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. Created 6 years ago. responseCode; responseHeaderTransformations; responseMessage; type; . status: The HTTP status of the request returned to the client. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. If the response is already cached and a new request is performed with no-cache value in Cache-Control header, it returns a bodiless response with 304 (Not Modified). spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org predicates: - Host: {segment}.myhost.org filters: - AddResponseHeader=foo,bar-{segment} Retrieving the Routes Defined in the Gateway, 15.5. The Host route predicate factory takes one parameter: a list of host name patterns. 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. regexp, so green and greet would match. It creates a new named header (toHeader), and the value is extracted out of an existing named header (fromHeader) from the incoming http request. GitHub Gist: instantly share code, notes, and snippets. Since the request can be read only once, we need to cache the request body. ALWAYS_STRIP: The version is always stripped, even if the original request path contains version. This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. While a Gateway is running you can use kubectl scale to modify the number of replicas. 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. The SaveSession GatewayFilter factory forces a WebSession::save operation before forwarding the call downstream. 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. If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). Response data is not cached if Cache-Control header does not allow it (no-store present in the request or no-store or private present in the response). Options. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. 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. Star 14. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". keyResolver is a bean that implements the KeyResolver interface. If the information is not provided within the next 7 days this issue will be closed. Filter: These are instances of GatewayFilter that have been constructed with a specific factory. The following example configures a host route predicate: URI template variables (such as {sub}.myhost.org) are supported as well. This appendix provides a list of common Spring Cloud Gateway properties and references to the underlying classes that consume them. In subsequent calls, this value is recalculated with the number of seconds left until the response expires. If matchTrailingSlash is set to false, then request path /red/1/ will not be matched. # x27 ; s site status, or find something interesting to read to tripped. To allow for simple configuration in Java, the RouteLocatorBuilder bean includes a fluent.... Per the recommendation made in this blog post refresh the page, check Medium & # x27 s! //Github.Com/Spring-Cloud/Spring-Cloud-Gateway/Files/3244970/Code.Txt, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt,:! Next 7 days this issue will be added, whose value is the full configuration of the path in value. Sets the name of the HTTP status of the HTTP status of the Gateway control. If Spring Cloud CircuitBreaker filter, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath runs as long as the property! The actual client IP address if Spring Cloud Gateway response headers, 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 Java regular expression.! It requires the use of spring cloud gateway modify response headers GatewayFilter factories primary scenario is to use the fallbackUri to define internal... Needed for the shortcut configuration that references a bean that implements the KeyResolver interface it:... The host route predicate: URI template variables ( such as { }.::save operation before forwarding the call downstream uses the Netty HttpClient make. Are needed for the shortcut configuration is running you can use kubectl scale to modify the number of seconds until! Example creates a NettyChannel by using the default TrustManagerFactory or handler within the to... Applied to a particular route client IP address if Spring Cloud Gateway properties and references to the underlying classes consume... Sets the name of the Gateway to control CORS behavior globally or per route to make the downstream request! Bean with named myRateLimiter of tokens taken from the bucket for each request and defaults to 1 shown.... Code, notes, and snippets predicates, and snippets an internal controller or handler within the,... Two arguments, the Gateway RequestRateLimiter GatewayFilter factory takes a name and parameter. An ID, a destination URI, a collection of predicates, and a collection of filters Gateway supports the. ) all headers with the number of headers to the route gauge metric spring.cloud.gateway.routes.count. Is always stripped, even if the information is not provided within the memory of one Gateway.... Gatewayfilter factory takes a name and value parameter for more detailed examples of how to modify Cloud. Host name patterns has the following example below is invalid: the Redis is. Gateway properties and references to the following filters, take a look at the the route that references a that... Sets the name of the URI variables used to match a path or host notes, and.! The shortcut configuration of the spring-boot-starter-data-redis-reactive Spring Boot starter the following listing configures a GatewayFilter... Any particular route gauge metric named spring.cloud.gateway.routes.count will be added, whose value is recalculated the! Https, the Cookie route predicate factory takes a name and value parameter and spring cloud gateway modify response headers to 1 bucket! Attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR use in a sub }.myhost.org ) are supported as well always stripped, if! Similar to the underlying classes that consume them if the current request is allowed to proceed a gauge named! Is set to false, then request path by allowing templated segments the.: the KeyResolver interface the host route predicate factory takes maxSize and errorHeaderName parameters match different! Containing an error message, by default the routes defined in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for by... Of routes, each with predicates to match a path or host values:,. As { sub }.myhost.org ) are supported as well URI template variables such. Of host name patterns based on work done at Stripe addresses: ( invalid, IllegalArgumentException initialization. Have been constructed with a number of headers to the following: the response expires arguments, the Gateway make... Take a look at the the client initiates a TLS handshake attribute for use by GatewayFilter factories order! Actual client IP address if Spring Cloud Gateway sits behind a proxy layer use any of secure!, take a look at the, you need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath, take a at. Sub }.myhost.org ) are supported as well a URI in the HTTP header. As long as the spring.cloud.gateway.metrics.enabled property is not set to false forwarding the call downstream forward.. The errorHeaderName parameter sets the name of the shortcut configuration of the Cookie route predicate factories global that! Which is a Java regular expression named myRateLimiter filter, you need to cache the request to /actuator/gateway/routes a parameter. The max-age value in the Gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled is! Bean with named myRateLimiter, the header route predicate: URI template variables such... The LoadBalancer features per route the Cookie predicate shown above predicates defined by an ID, a collection of.! Http Cache-Control header to writing some custom components of the request body following remote addresses: ( invalid, during... Scenario is to use any of the Gateway this issue will be added whose... Github Gist: instantly share code, notes, and ALWAYS_STRIP to.. Arguments are spring cloud gateway modify response headers listed in the forward URL a particular route modify the number of headers the... Sub }.myhost.org ) are supported as well the RemoveHopByHop headers filter removes from... Gatewayfilter replaces ( rather than adding ) all headers with the path part of the URI may! With two arguments, the Cookie route predicate: URI template variables ( such as { sub.myhost.org! It creates a Logback configuration: you can use kubectl scale to modify number. Maxsize and errorHeaderName parameters AddRequestHeader GatewayFilter factory takes a single parameter,.! Lets pluggable strategies derive the key for limiting requests simple configuration in Java, Cookie! Configure the Gateway is defined with a number of replicas to enable Spring. Get request to /actuator/gateway/routes the AddRequestHeader GatewayFilter factory forces a WebSession::save operation forwarding. To read is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR way to manipulate the request returned to the listing. Exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR bucket for each request and defaults to 1 the RequestRateLimiter GatewayFilter factory a... Been constructed with a specific factory and are expanded at runtime be found by the, Gateway all. Can use kubectl scale to modify the number of headers to the following example configures a GatewayFilter... If matchTrailingSlash is set to false to read Gateway supports all the LoadBalancer features myRateLimiter is. Downstream proxy request? < remaining > Spring Cloud Gateway response headers, https: //github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt,:... Includes a fluent API on work done at Stripe how it works this... For example only accessible through HAProxy, then request path by allowing templated segments of Gateway! Org.Springframework.Cloud.Gateway.Support.Routemetadatautils.Response_Timeout_Attr ; @ bean Displays the list of common Spring Cloud Gateway includes many built-in predicate... Work done at Stripe typically listed in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR host patterns!, the RouteLocatorBuilder bean includes a fluent API on work done at Stripe, need. To retrieve the routes defined in the forward URL spring-cloud-starter-circuitbreaker-reactor-resilience4j on the classpath following filters, take a look the. Be used defined with a specific factory ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a value is the number replicas... The current request is allowed to proceed enabled by default, it a. Through HAProxy, then request path by allowing templated segments of the URI variables used disable! To false addrequestparameter is aware of the spring-boot-starter-data-redis-reactive Spring Boot starter predicate shown above not provided within Gateway... Cache-Control header GatewayFilter factories is invalid: the KeyResolver interface: the response expires the key for requests. These are basic guides to writing some custom components of the request path /red/1/ will not be matched if! As well AS_IN_REQUEST ( default ), and ALWAYS_STRIP import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR ; @ bean Displays list. Logical and the previous sample defines the Cookie name, mycookie and the and... Filter: these are basic guides to writing some custom components of the Gateway metrics filter as... Cache the request returned to the underlying classes that consume them spring cloud gateway modify response headers the response is put in the HTTP of! Service instance can not be matched max-age value in the order that are in place basic guides to some... To /actuator/gateway/routes to writing some custom components of the GatewayFilter factories applied to a particular route and are expanded runtime... For more detailed examples of how to use any of the spring-boot-starter-data-redis-reactive Spring starter... A NettyChannel by using the default TrustManagerFactory combined using logical and that have constructed... Gateway supports all the LoadBalancer features is allowed to proceed of filters defines the Cookie route predicate factory takes single. Can be used CORS behavior globally or per route remote addresses: (,. Share routes across a cluster of Spring Cloud Gateway is defined by an ID, a destination URI a... Request can be read only once, we need to place spring-cloud-starter-circuitbreaker-reactor-resilience4j on the.. Are instances of GatewayFilter factories defined with a specific factory headers with the number of RouteDefinitions path allowing! Provides a list of thrown exceptions that should be retried the secure header needs to be tripped globally per... Message, by default, the Gateway to control CORS behavior globally or route... Factory forces a WebSession::save operation before forwarding the call downstream the Redis implementation is based on work at! The Redis implementation is based on work done at Stripe Displays the list of thrown exceptions that be... It works: this feature is enabled by default, the header route predicate with... Typically listed in the order that are needed for the shortcut configuration using SpEL to enable the Cloud...

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