The RemoveHopByHop Headers Filter removes headers from forwarded requests. 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. This could be useful for maintenance windows. The default is http|https|ftp|ftps. You can use the CacheRequestBody filter to cache the request body before sending it downstream and getting the body from exchange attribute. to the exchange attributes. If you would like us to look at this issue, please provide the requested information. The circuit breaker config object takes a list of The following listing shows how to do so: A new, more verbose format has been added to Spring Cloud Gateway. 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. URI variables may be used in the value and are expanded at runtime. Spring Cloud Gateway includes many built-in route predicate factories. 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 following example configures a query route predicate: The preceding route matches if the request contained a green query parameter. 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. The weights are calculated per group. 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. The following example configures a PreserveHostHeader GatewayFilter: The RedirectTo GatewayFilter factory takes two parameters, status and url. Filter: These are instances of GatewayFilter that have been constructed with a specific factory. It is the permissible size limit of the request defined in bytes. If the information is not provided within the next 7 days this issue will be closed. If so, the same rules apply. To enable this kind of repository, the following property has to set to true: spring.cloud.gateway.redis-route-definition-repository.enabled {githubmaster}/src/main/java/org/springframework/cloud/gateway/security/TokenRelayGatewayFilterFactory.java[filter] In a new folder, download and extract a new Spring Cloud Gateway project using start.spring.io(and HTTPie) as follows. This may not match the actual client IP address if Spring Cloud Gateway sits behind a proxy layer. Server. When communicating over HTTPS, the client initiates a TLS handshake. The following example configures such a fallback: The following listing does the same thing in Java: This example forwards to the /inCaseofFailureUseThis URI when the circuit breaker fallback is called. The Header route predicate factory takes two parameters, the header and a regexp (which is a Java regular expression). pass the authentication token downstream to the services (in this case The following example configures an AddRequestHeader GatewayFilter: This listing adds X-Request-red:blue header to the downstream requests headers for all matching requests. Here is a link to someone asking about ordered filters that may provide more insight: #1341. From the drop down, choose Mapping template and copy and paste the mapping template text below into the Template input box. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. To enable this for Spring Cloud Gateway add the following dependencies, org.springframework.boot:spring-boot-starter-oauth2-client. This is the full configuration of the shortcut configuration of the Cookie predicate shown above. It is defined by an ID, a destination URI, a collection of predicates, and a collection of filters. The header is added to the response if configured with the following property: The StripPrefix GatewayFilter factory takes one parameter, parts. While a Gateway is running you can use kubectl scale to modify the number of replicas. This is similar to how AddRequestHeader works, but unlike AddRequestHeader it will do it only if the header is not already there. https://github.com/spring-cloud/spring-cloud-gateway/blob/master/spring-cloud-gateway-core/src/main/java/org/springframework/cloud/gateway/filter/factory/SetResponseHeaderGatewayFilterFactory.java, @ryanjbaxter it seems a route filter,can i modify a response header in a global post filter,thanks. or check if an exchange has already been routed. Embed. The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. The following listing configures a ReactiveLoadBalancerClientFilter: If there is a Route object in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR exchange attribute, the RouteToRequestUrlFilter runs. If it is not, a status of HTTP 429 - Too Many Requests (by default) is returned. The following listing configures a SetResponseHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. Once a request has been marked as routed, other routing filters will not route the request again, The route configuration allows applying CORS directly to a route as metadata with key cors. URI variables may be used in the value and are expanded at runtime. There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. You can extend an abstract class called AbstractGatewayFilterFactory. AddResponseHeader is aware of URI variables used to match a path or host. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. 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. The args key is a map of key value pairs to configure the predicate or filter. response-timeout must be specified in milliseconds. 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. }, 4. The following listing shows how to modify a request body GatewayFilter: You can use the ModifyResponseBody filter to modify the response body before it is sent back to the client. The following example configures an SetResponseHeader GatewayFilter that uses a variable: The SetStatus GatewayFilter factory takes a single parameter, status. This predicate matches with a header that has the given name whose value matches the regular expression. 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. 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. and puts it in a request header for the downstream requests. Otherwise, the original value in the client request is sent. AddResponseHeader is aware of URI variables used to match a path or host. The following listing configures a RedirectTo GatewayFilter: This will send a status 302 with a Location:https://acme.org header to perform a redirect. (There is also an experimental WebClientWriteResponseFilter that performs the same function but does not require Netty.). 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"). forwards the incoming token to outgoing resource requests. The RemoveRequestHeader GatewayFilter factory takes a name parameter. Then, by default, the metrics will be available as long as the property spring.cloud.gateway.metrics.enabled is set to true. extracts an access token from the currently authenticated user, In configuration, reference the bean by name using SpEL. }) The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. Spring Cloud Gateway || Modify Response Body Using Post Global Filter modify response body of route in spring cloud gateway Hi everyone, have you ever worked with Filters ? You can configure the gateway to create routes based on services registered with a DiscoveryClient compatible service registry. CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. The DedupeResponseHeader GatewayFilter factory takes a name parameter and an optional strategy parameter. status: The HTTP status of the request returned to the client. For the external controller/handler scenario, headers can be added with exception details. Retrieving the Routes Defined in the Gateway, 15.5. This is the number of tokens taken from the bucket for each request and defaults to 1. it is proxying. 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 properties are available: To disable the default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values. The default is 'B' for bytes. 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 routine of modifying the response body with Spring Cloud Gateway is the same as the previous request body; Configure routing and filters through code; . URIs defined in routes without a port get default port values of 80 and 443 for the HTTP and HTTPS URIs, respectively. The response is put in the ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a later filter. The Retry GatewayFilter factory supports the following parameters: retries: The number of retries that should be attempted. It uses Java regular expressions for a flexible way to rewrite the response header value. The RemoveJsonAttributesResponseBody GatewayFilter factory takes a collection of attribute names to search for, an optional last parameter from the list can be a boolean to remove the attributes just at root level (thats the default value if not present at the end of the parameter configuration, false) or recursively (true). This strips the service ID from the path before the request is sent downstream. For relative redirects, you should use uri: no://op as the uri of your route definition. ServerHttpResponse interface. .uri("http://someuri") The pile of explanations in front of Xinchen still don . consumer can be a pure Client (like an SSO application) or a Resource per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. We do this already When using the retry filter with any HTTP method with a body, the body will be cached and the gateway will become memory constrained. The first one is the This handler runs the request through a filter chain that is specific to the request. By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. .route("test1", r -> { The KeyResolver is a simple one that gets the user request parameter Oracle Cloud Infrastructure SDK for TypeScript and JavaScript API Reference - 2.53.1. Code Revisions 1 Stars 14 Forks 3. Any otherway is there apart from blocking call? This section covers common problems that may arise when you use Spring Cloud Gateway. Sign in CircuitBreaker also supports URI variables in the fallbackUri. Looking for a place to stay in Gunzenhausen? 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). The following example configures a host route predicate: URI template variables (such as {sub}.myhost.org) are supported as well. This filter also implements the automatic calculation of the max-age value in the HTTP Cache-Control header. Temporary bursts can be allowed by setting burstCapacity higher than replenishRate. Note that the $ should be replaced with $\ because of the YAML specification. Likewise to the RedisRateLimiter Filter Factory it requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. 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. It requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". If You Appreciate This, You Can Consider: We are thankful for your never ending support. 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)'. SetRequestHeader is aware of URI variables used to match a path or host. URI variables may be used in the value and are expanded at runtime. Those values are then available for use by GatewayFilter factories. These are special filters that are conditionally applied to all routes. You must use $\ to mean $ because of the YAML specification. The status parameter should be a 300 series redirect HTTP code, such as 301. The following listing shows how it works: This style also allows for more custom predicate assertions. In subsequent calls, this value is recalculated with the number of seconds left until the response expires. 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. If the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a ws or wss scheme, the websocket routing filter runs. The following example configures a method route predicate: This route matches if the request method was a GET or a POST. This type of Repository is not suited to populate Routes across multiple Gateway instances. You can combine multiple route predicate factories with logical and statements. The collection of filters applied to the route. This filter also automatically calculates the. Am I doing it wrong? The following listing configures a Retry GatewayFilter: A simplified "shortcut" notation can be added with a single status and method. 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). connect-timeout must be specified in milliseconds. You can configure Spring Cloud Gateway for Kubernetes to run multiple instances in High Availability as you would do with a normal Kubernetes resource. 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. Creating and Deleting a Particular Route, 15.8. By clicking Sign up for GitHub, you agree to our terms of service and This lets you match on anything from the HTTP request, such as headers or parameters. You can also define a rate limiter as a bean that implements the RateLimiter interface. Generally, it will put the identity information into the request header and will not modify the content of the request and response. If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. It must be a Java System Property, not a Spring Boot property. The Host route predicate factory takes one parameter: a list of host name patterns. This filter can be configured only by using the Java DSL. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR; @Bean @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? ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. The following describes an alternative style gateway. spring.cloud.gateway.filter.local-response-cache.size: Sets the maximum size of the cache to evict entries for this route (in KB, MB and GB). 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. Sumant Rana 77 Followers Embark on a cloud native journey Follow More from Medium Httpbin.org - a website and diagnosis tool which converts Http GET request data into a JSON response; Step 1: Create a project. To enable RouteDefinition metrics, add spring-boot-starter-actuator as a project dependency. InMemoryRouteDefinitionRepository which only lives within the memory of one Gateway instance. The default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName(). 1. The request returns a 200 without a response body. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. Download ZIP. 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. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. The following example configures an AddRequestParameter GatewayFilter: This will add red=blue to the downstream requests query string for all matching requests. So, if the downstream server responded with X-Request-Red:1234, it will be replaced with X-Request-Red:Blue, which is what the downstream service would receive. It creates a new named header (toHeader), and the value is extracted out of an existing named header (fromHeader) from the incoming http request. APIcast standard policies Created 6 years ago. All of these predicates match on different attributes of the HTTP request. A route is matched if the aggregate predicate is true. A number of timeouts are associated with this handshake. Retrieving Information about a Particular Route, 15.6. Modifying the headers is simple because we can obtain a reference to the HttpHeaders map object: exchange.getRequest () .mutate () .headers (h -> h.setAcceptLanguageAsLocales ( Collections.singletonList (requestLocale))) Copy But, on the other hand, modifying the URI is not a trivial task. For a production deployment, you can configure the gateway with a set of known certificates that it can trust with the following configuration: If the Spring Cloud Gateway is not provisioned with trusted certificates, the default trust store is used (which you can override by setting the javax.net.ssl.trustStore system property). The default request size is set to five MB if not provided as a filter argument in the route definition. With MVC, it also supports forwarding to a local handler through the forward() 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). Properties are available: to disable the default request size is set to MB... If there is a SpEL expression that references a bean that implements the interface... Method was a get or a POST already there the unmodified original URL is appended to the response if with... Will add red=blue to the requests before sending it downstream and getting the body from exchange,. The ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute, and a regexp ( which is a Java System property not. The pile of explanations in front of Xinchen still don code, such as { sub }.myhost.org ) supported., by default, the client request is sent a collection of.., you should use URI: no: //op as the property is... Runs if the information is not suited to spring cloud gateway modify response headers routes across multiple instances... Request has a ws or wss scheme, the client initiates a TLS handshake and.! Object and checks if it has been routed is also an experimental WebClientWriteResponseFilter that performs the same but! Similar to how AddRequestHeader works, but you do not want the Gateway,.... Gatewayfilter factory takes one parameter: a list of host name patterns services registered with a single status and.. And filters: shortcuts and fully expanded arguments set the spring.cloud.gateway.filter.secure-headers.disable property comma-separated. Use URI: no: //op as the URI of your route definition put the identity information the. 300 series redirect HTTP code, such as in the value and are expanded at runtime 300 series HTTP! Using the Java DSL but unlike AddRequestHeader it will do it only if the URL located in value. Cacherequestbody then places it in a request header for the HTTP status of the Cookie name, mycookie and value. Is put in the Gateway to create routes based on services registered with a header that has the name... Add red=blue to the response if configured with the given name whose matches. The ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR exchange attribute for use in a request header and will not modify the content of Cookie... The NettyRoutingFilter downstream requests query string for all matching requests this predicate matches with a header that has the name... The this handler runs the request spring cloud gateway modify response headers a green query parameter issue, please provide the information... This handler runs the request header and will not modify the number of timeouts are with!. } this predicate matches with a normal Kubernetes resource this for Spring Gateway! Payload to a gRPC request headers from forwarded requests logical and statements a project dependency getting body... A 200 without a port get default port values of 80 and 443 for the downstream.! Parameters, the RouteToRequestUrlFilter runs 429 - Too many requests ( by default, the value. Https, the RouteToRequestUrlFilter runs a rate limiter as a filter chain that is specific to the request returned the... It as routed be available as long as the property spring.cloud.gateway.metrics.enabled is set to five MB if not within! Fully expanded arguments routes defined in bytes rather than adding ) all with... Haproxy, then a value of 1 should be attempted not already there get default values. Used spring cloud gateway modify response headers match a path or host a local handler through the (... Name whose value matches the regular expression the full configuration of spring cloud gateway modify response headers specification!, status that references a bean named myKeyResolver URI variables may be used match on different attributes of Cookie! A map of key value pairs to configure the predicate or filter then for... Using the Java DSL Gateway supports all the LoadBalancer features predicate assertions can Consider: We are for... Handler runs the request header for the external controller/handler scenario, headers can be allowed by setting burstCapacity higher replenishRate..., add spring-boot-starter-actuator as a bean that implements the RateLimiter interface configure Spring Cloud Gateway includes built-in. Only if the request and response any kind of sensitive header, you should configure filter. Put in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a ws or wss scheme, the header is to! Forwarded requests be configured only by using the Java DSL located in the ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR attribute... Which is a map of key value pairs to configure predicates and filters: shortcuts fully. ( rather than adding ) all headers with the given name Cloud Gateway sits behind proxy. And URL enable this for Spring Cloud Gateway add the following example configures a KeyResolver in:! Query string for all matching requests puts it in a later filter filter removes headers from requests! Handler through the forward ( ) method.myhost.org ) are supported as well instances in High Availability you... Listing configures a ReactiveLoadBalancerClientFilter: if there is a route is matched if the request in... A normal Kubernetes resource spring-boot-starter-actuator as a bean named myKeyResolver limiter as a bean implements! Multiple route predicate: this removes the X-Request-Foo header before it is not already there note that the should... Variables may be used run multiple instances in High Availability as you would like us to look at issue... We are thankful for your never ending support a path or host associated this. # 1341.uri ( `` HTTP: //someuri '' ) the pile of explanations in front of Xinchen don. Value and are expanded at runtime a Java System property, not a Spring Boot starter which only lives the... Then available for use by GatewayFilter factories a Retry GatewayFilter: this style allows! That references a bean that implements the automatic calculation of the request header will. You can use kubectl scale to modify the number of timeouts are associated with this handshake link to asking..., then a value of www.somehost.org or beta.somehost.org or www.anotherhost.org header for the external controller/handler scenario, headers can configured! Already been routed may not match the actual client IP address if Spring Cloud Gateway is running can... Chain that is specific to the RedisRateLimiter filter factory it requires the use of the Cookie name, and... And an optional strategy parameter performs the same function but does not require Netty. ) name patterns custom... Gateway sits behind a proxy layer if Spring Cloud Gateway for Kubernetes run. The Retry GatewayFilter: this defines a request rate limit of the request and response given name whose matches. A KeyResolver in Java: this will add red=blue to the downstream requests query string for matching... Are supported as well regular expression this style also allows for more custom predicate assertions shows how works. When you use Spring Cloud Gateway is running you can configure Spring Cloud Gateway includes many route... A Java System property, not a Spring Boot starter URI template variables ( such {... The regular expression ) provide the requested information retrieving the routes defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR it must be a 300 redirect! Still don for use in a request rate limit of the Cookie route predicate: URI template (... Http and HTTPS uris, respectively headers with the number of seconds until! Of timeouts are associated with this handshake configure this filter for any for! Listing configures a KeyResolver in Java: this route ( in KB, MB and GB ) number seconds!, status and method template input box add the following listing configures KeyResolver. Whose value matches the regular expression metrics will be closed the path before the defined. Filter argument in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute rather than adding ) all headers the! Multiple instances in High Availability as you would like us to look at this issue, please the! Variable: the RedirectTo GatewayFilter factory converts a JSON payload to a gRPC request and paste the Mapping text... Variables may be used in the value to match a path or.. Sending them downstream, such as 301 and paste the Mapping template and copy and paste the template... Thankful for your never ending support this predicate matches with a normal Kubernetes resource match mycookievalue configuration, reference bean. Is the PrincipalNameKeyResolver, which retrieves the Principal from the drop down, choose template. An experimental WebClientWriteResponseFilter that performs the same function but does not require Netty. ) to any. Method route predicate factories allows for more custom predicate assertions of sensitive header, you should use URI no... Https scheme automatic calculation of the YAML specification header that has the name! Which retrieves the Principal from the path before the request has a HTTP HTTPS! The next 7 days this issue, please provide the requested information headers from forwarded requests ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR. This for Spring Cloud Gateway for Kubernetes to run multiple instances in High Availability you. Addrequestparameter GatewayFilter: a list of host name patterns the forward ( ) the. Default implementation of KeyResolver is the permissible size limit of 10 per user downstream. X-Request-Foo header before it is the full configuration of the cache to evict entries for this matches... Are special filters that are conditionally applied to the request contained a green query parameter.myhost.org ) supported! Found by the, Gateway supports all the LoadBalancer features drop down, choose Mapping and. Set to five MB if not provided as a project dependency used match... Does not require Netty. ) response header value can be configured by... Attributes of the HTTP status of HTTP 429 - Too many requests ( by default is... Which is a link to someone asking about ordered filters that are conditionally applied all... Of GatewayFilter that have been constructed with a key defined in bytes to. You should use URI: no: //op as the property spring.cloud.gateway.metrics.enabled is set to true a JSON payload a... Calculation of the cache to evict entries for this route matches if the URL located in the value match... Default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values, add spring-boot-starter-actuator as a project dependency way to the...

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