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 preceding route matches if the request contained a red query parameter whose value matched the gree. which are java ZonedDateTime objects. if. You can use the CacheRequestBody filter to cache the request body before sending it downstream and getting the body from exchange attribute. 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. and puts it in a request header for the downstream requests. This is useful when you try to support CORS preflight requests and your route predicate does not evaluate to true because the HTTP method is options. This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. The resulting response is similar to the following: The response contains the details of the global filters that are in place. In case of the request being forwarded to fallback, the Spring Cloud CircuitBreaker Gateway filter also provides the Throwable that has caused it. This predicate matches requests that happen after datetime1 and before datetime2. The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. This handler runs the request through a filter chain that is specific to the request. You can read more about them in the. httpMethod: The HTTP method used for the request. The ReactiveLoadBalancerClientFilter looks for a URI in the exchange attribute named ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. 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). .uri("http://someuri") By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. 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'. The RemoveRequestHeader GatewayFilter factory takes a name parameter. The RemoteAddr Route Predicate Factory, 5.10.1. method: Method name in the service that handles the request. The following example below is invalid: The Redis implementation is based on work done at Stripe. The collection of filters applied to the route. Retrieving Information about a Particular Route, 15.6. For example, you can match on the path segment of the URL or the HTTP method of the request. 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.) Then, by default, the gateway metrics filter runs as long as the spring.cloud.gateway.metrics.enabled property is not set to false. 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. The RewriteResponseHeader GatewayFilter factory takes name, regexp, and replacement parameters. The RemoveRequestParameter GatewayFilter factory takes a name parameter. It uses the Netty HttpClient to make the downstream proxy request. 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. Created 6 years ago. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. Spring Cloud Gateway aims to provide a simple, yet effective way to route to APIs and provide cross cutting concerns to them such as: security, monitoring/metrics, and resiliency. During your stay, take advantage of some of the amenities offered, including a 24 hour front desk, room service, and a gift shop. In addition, through the spring.cloud.gateway.metrics.tags.path.enabled property (by default, false), you can activate an extra metric with the path tag: These metrics are then available to be scraped from /actuator/metrics/spring.cloud.gateway.requests and can be easily integrated with Prometheus to create a Grafana dashboard. The circuit breaker config object takes a list of CacheRequestBody then places it in the attributes available from ServerWebExchange.getAttributes(), with a key defined in ServerWebExchangeUtils.CACHED_REQUEST_BODY_ATTR. The gateway maintains a client pool that it uses to route to backends. It may be the integer value 404 or the string representation of the enumeration: NOT_FOUND. (There is also an experimental WebClientHttpRoutingFilter that performs the same function but does not require Netty. In order to share Routes across a cluster of Spring Cloud Gateway instances, RedisRouteDefinitionRepository can be used. 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. The following example shows such an errorMessage: There are certain situation when the host header may need to be overridden. For a full working sample see this project. This interface and its usage are subject to change in future milestone releases. httpStatusCode: The HTTP Status of the request returned to the client. 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 redis-rate-limiter.burstCapacity property is the maximum number of requests a user is allowed in a single second (without any dropped requests). The following listing configures a SetRequestHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. The following example configures an RemoveJsonAttributesResponseBody GatewayFilter that uses the optional last parameter: This removes attributes "id" and "color" from the JSON content body at any level. The parts parameter indicates the number of parts in the path to strip from the request before sending it downstream. The accepted values are RETAIN_FIRST (default), RETAIN_LAST, and RETAIN_UNIQUE. Usually it's a common requirement that applications can . In order to write a Route Predicate you will need to implement RoutePredicateFactory as a bean. The following example configures a Spring Cloud CircuitBreaker GatewayFilter: To configure the circuit breaker, see the configuration for the underlying circuit breaker implementation you are using. 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. The following describes an alternative style gateway. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method. URI variables may be used in the value and will be expanded at runtime. The XForwarded Remote Addr Route Predicate Factory, 6.5.1. The following MVC example proxies a request to /test downstream to a remote server: The following example does the same thing with Webflux: Convenience methods on the ProxyExchange enable the handler method to discover and enhance the URI path of the incoming request. URIs defined in routes without a port get default port values of 80 and 443 for the HTTP and HTTPS URIs, respectively. 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. The url parameter should be a valid URL. By default, when a service instance cannot be found by the, Gateway supports all the LoadBalancer features. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. If maxBackoff is configured, the maximum backoff applied is limited to maxBackoff. ServerHttpResponse interface. This filter (which configures the local response cache per route) is available only if the local response global cache is enabled. 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. The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. Fully expanded arguments appear more like standard yaml configuration with name/value pairs. response-timeout must be specified in milliseconds. .application.yml. If it is not provided, the value of the Host request header is used. 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. ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. The default is 'B' for bytes. There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. The body is cached in a request attribute defined by. . value or the String representation of the HttpStatus enumeration. 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. Spring Cloud Gateway 1AddRequestHeader GatewayFilter Factory2AddRequestParameter GatewayFilter Factory3AddResponseHeader GatewayFilter Factory4DedupeResponseHeader GatewayFilter Fa. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). The following example configures a RemoteAddr route predicate: This route matches if the remote address of the request was, for example, 192.168.1.10. Note that the $ should be replaced with $\ because of the YAML specification. The new URI is placed in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute. HttpHeadersFilters are applied to the requests before sending them downstream, such as in the NettyRoutingFilter. You can configure additional parameters for each route by using metadata, as follows: You could acquire all metadata properties from an exchange, as follows: Http timeouts (response and connect) can be configured for all routes and overridden for each specific route. Spring Cloud supports Resilience4J out of the box. returned from the route it wraps. It offers a simple way to manipulate the request path by allowing templated segments of the path. This route predicate allows requests to be filtered based on the X-Forwarded-For HTTP 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). Various properties can be specified inside your application.properties file, inside your application.yml file, or as command line switches. Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. Feign is a great way to communicate between services and send data like a JSON request body, single header or multiple headers and much more. If you include the starter, but you do not want the gateway to be enabled, set spring.cloud.gateway.enabled=false. The following properties are available: To disable the default values set the spring.cloud.gateway.filter.secure-headers.disable property with comma-separated values. If the URL has a lb scheme (such as lb://myservice), it uses the Spring Cloud ReactorLoadBalancer to resolve the name (myservice in this example) to an actual host and port and replaces the URI in the same attribute. InMemoryRouteDefinitionRepository which only lives within the memory of one Gateway instance. Otherwise, the original value in the client request is sent. it is proxying. It is the name of the header to be removed. 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. The ServerHttpResponse instance is used to . You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. 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. Properties. /resource). 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 is the number of tokens the token bucket can hold. The following example configures an AddRequestParameter GatewayFilter that uses a variable: The AddResponseHeader GatewayFilter Factory takes a name and value parameter. The pile of explanations in front of Xinchen still don . If You Appreciate This, You Can Consider: We are thankful for your never ending support. For more information on circuit breakers and the gateway see the Spring Cloud CircuitBreaker Factory section. 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 RequestRateLimiter GatewayFilter factory uses a RateLimiter implementation to determine if the current request is allowed to proceed. The following listing defines a rate limiter that uses the KeyResolver defined in the previous listing: The RewriteLocationResponseHeader GatewayFilter factory modifies the value of the Location response header, usually to get rid of backend-specific details. First-class support is provided for sensitive headers (by default, cookie and authorization), which are not passed downstream, and for proxy (x-forwarded-*) headers. Passing headers with Spring Cloud Feign. XForwardedRemoteAddressResolver has two static constructor methods, which take different approaches to security: XForwardedRemoteAddressResolver::trustAll returns a RemoteAddressResolver that always takes the first IP address found in the X-Forwarded-For header. The JSONToGRPCFilter GatewayFilter Factory converts a JSON payload to a gRPC request. All. Value 3.9. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. 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. Zuul profile. Add a response header named X-Request-Foo with a value of Bar to the original response. Here, you can modify requests and responses before or after sending the downstream request. (There is also an experimental WebClientWriteResponseFilter that performs the same function but does not require Netty.). A route is matched if the aggregate predicate is true. The redis-rate-limiter.replenishRate property defines how many requests per second to allow (without any dropped requests). Spring Cloud Gateway includes many built-in GatewayFilter Factories. AddRequestHeader is aware of the URI variables used to match a path or host. The following listing shows the KeyResolver interface: The KeyResolver interface lets pluggable strategies derive the key for limiting requests. The Cookie route predicate factory takes two parameters, the cookie name and a regexp (which is a Java regular expression). 4.1. To write a custom global filter, you must implement GlobalFilter interface as a bean. This filter can be configured only by using the Java DSL. Create a ClientResponse object that will hold both the body and the headers: Then extract the body and encrypt it using the EncryptDecryptHelper class. Naming Custom Filters And References In Configuration, 18. 2016-10-05: 4.3: CVE-2016-6426 CISCO 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 stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. The filter takes a maxSize parameter. Let's simplify this scenario. The following example shows how to do so: The SetPath GatewayFilter factory takes a path template parameter. The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". You can enable, disable, or configure policies to control how they modify APIcast. response Header Transformations: . *) and the replacement /${remaining}. For the external controller/handler scenario, headers can be added with exception details. the ID of the service from the DiscoveryClient. When using the retry filter with any HTTP method with a body, the body will be cached and the gateway will become memory constrained. exceptions: A list of thrown exceptions that should be retried. reverse proxies. Am I doing it wrong? If the information is not provided within the next 7 days this issue will be closed. This is the rate at which the token bucket is filled. 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. Single second ( without any dropped requests ) get default port values of and. 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