spring cloud gateway

The stripVersionMode parameter has the following possible values: NEVER_STRIP, AS_IN_REQUEST (default), and ALWAYS_STRIP. The arguments are typically listed in the order that would be needed for the shortcut configuration. spring-cloud gateway az spring-cloud gateway route-config Reference Feedback Note This reference is part of the spring-cloud extension for the Azure CLI (version 2.30.0 or higher). This predicate matches cookies that have the given name and whose values match the regular expression. The RemoveRequestParameter GatewayFilter factory takes a name parameter. We need to provide the following variables: checkstyle.header.file - please point it to the Spring Cloud Builds, spring-cloud-build-tools/src/main/resources/checkstyle-header.txt file either in your cloned repo or via the https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle-header.txt URL. 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)'. To create a route, make a POST request to /gateway/routes/{id_route_to_create} with a JSON body that specifies the fields of the route (see Retrieving Information about a Particular Route). 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. Note that this example also demonstrates the (optional) Spring Cloud Netflix Ribbon load-balancing (defined by the lb prefix on the destination URI). The Spring Cloud Gateway has three important parts to it. Spring Cloud CircuitBreaker GatewayFilter Factory, 12.4.1. The /gateway actuator endpoint lets you monitor and interact with a Spring Cloud Gateway application. There are convenience methods that you can use to mark an exchange as routed If the fallback is called, the request is forwarded to the controller matched by the URI. Spring Cloud Gateway. To configure Global http timeouts: The following diagram provides a high-level overview of how Spring Cloud Gateway works: Clients make requests to Spring Cloud Gateway. Displays the list of routes defined in the gateway. This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method. A steady rate is accomplished by setting the same value in replenishRate and burstCapacity. It consists of the following building blocks- Route: Route the basic building block of the gateway. sign in Request Rate Limiting. Introduction. You can combine multiple route predicate factories with logical and statements. 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. You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. unacceptable behavior to spring-code-of-conduct@pivotal.io. Features. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. Add some Javadocs and, if you change the namespace, some XSD doc elements. The following listing configures a ReactiveLoadBalancerClientFilter: The Netty routing filter runs if the URL located in the ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR exchange attribute has a http or https scheme. Currently, only forward: schemed URIs are supported. The RewritePath GatewayFilter factory takes a path regexp parameter and a replacement parameter. If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. AS_IN_REQUEST The version is stripped only if the original request path contains no version. Go to File Settings Editor Inspections. Then point to the project-root/src/checkstyle/checkstyle-suppressions.xml folder. a modified file in the correct place. For relative redirects, you should use uri: no://op as the uri of your route definition. As usual, all code is available over on GitHub. The RemoveRequestHeader GatewayFilter factory takes a name parameter. series: The series of status codes to be retried, represented by using org.springframework.http.HttpStatus.Series. The following examples show how to do so: Custom filters class names should end in GatewayFilterFactory. If the URL has a forward scheme (such as forward:///localendpoint), it uses the Spring DispatcherHandler to handle the request. Active contributors might be asked to join the core team, and The following listing configures a filter chain: The ForwardRoutingFilter looks for a URI in the exchange attribute ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR. To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}. If it is not provided, the value of the Host request header is used. Instead, this time well focus on a particular usage scenario that arises from time to time when designing a solution around an API Gateway: how to process a backend response payload before sending it back to the client? You can configure the SetStatus GatewayFilter to return the original HTTP status code from the proxied request in a header in the response. Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. In another, run a client, connecting through gateway: wscat --connect ws://localhost:8080/echo. For example, set duplicate-finder-maven-plugin.skip to true in order to skip duplicates check in your build. First, you must get the assigned public endpoint for Spring Cloud Gateway and API portal by following these steps: Open your Enterprise tier service instance in Azure portal. The unmodified original URL is appended to the list in the ServerWebExchangeUtils.GATEWAY_ORIGINAL_REQUEST_URL_ATTR attribute. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. ServerWebExchangeUtils.isAlreadyRouted takes a ServerWebExchange object and checks if it has been routed. 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. Easy to extend and/or customize using standard Spring patterns marketplace". In the image above, weve picked the rules from the cloned Spring Cloud Build repository. 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. It then builds a registry of available filters that we can use when declaring routes: Notice that, when using this configuration-based approach to define routes, it is important to name our factory according to SCGs expected naming convention: FilterNameGatewayFilterFactory. It must be a Java System Property, not a Spring Boot property. The After route predicate factory takes one parameter, a datetime (which is a java ZonedDateTime). The RewriteResponseHeader GatewayFilter factory takes name, regexp, and replacement parameters. following command: The generated eclipse projects can be imported by selecting import existing projects The following defaults are configured for Retry filter, if enabled: exceptions: IOException and TimeoutException. The Spring Cloud CircuitBreaker filter can also accept an optional fallbackUri parameter. 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 . Those values are then available for use by GatewayFilter factories. By default, if the KeyResolver does not find a key, requests are denied. Fixed a classcast for gateway observation; https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle.xml, https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle-header.txt, https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml, You can also install Maven (>=3.3.3) yourself and run the, Be aware that you might need to increase the amount of memory 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 following listing configures a Retry GatewayFilter: When the request size is greater than the permissible limit, the RequestSize GatewayFilter factory can restrict a request from reaching the downstream service. Go to File Settings Editor Code style. you can import formatter settings using the The following listing shows how to modify a response body GatewayFilter: To add a filter and apply it to all routes, you can use spring.cloud.gateway.default-filters. They can also be Retrieving the Routes Defined in the Gateway, 15.5. Eclipse when working with the code. conduct. The following listing configures a websocket routing filter: To enable gateway metrics, add spring-boot-starter-actuator as a project dependency. Project defaults for Intellij that apply most of Checkstyle rules, Project style conventions for Intellij that apply most of Checkstyle rules. The predicates defined by RouteDefinitionLocator beans are combined using logical and. The primary scenario is to use the fallbackUri to define an internal controller or handler within the gateway application. Websocket Sample. However, there is one in another application, registered under localhost:9994. This method takes three arguments: two classes (in and out) and a function that can transform from the incoming type to the outgoing. Spring Cloud Gateway Well, as you probably know, Spring has support for API gateway provided as part of the Spring Cloud ecosystem and relies also on reactive libraries to secure. You can also define a rate limiter as a bean that implements the RateLimiter interface. Spring Cloud Gateway is API Gateway implementation by the Spring Cloud team on top of the Spring reactive ecosystem. You can add headers to the downstream response by using the header() methods on ProxyExchange. Moreover, once weve created our filter component, we can apply it to any declared route. To retrieve the routes defined in the gateway, make a GET request to /actuator/gateway/routes. Heres a list of some cases where we might use this capability: In more practical terms, fulfilling those requirements mean that we need to implement a filter to process backend responses. checkstyle.additional.suppressions.file - this variable corresponds to suppressions in your local project. Other IDEs and tools ServerWebExchangeUtils.setAlreadyRouted takes a ServerWebExchange object and marks it as routed. In this tutorial, we'll look at how we use Spring Cloud Gateway to inspect and/or modify the response body before sending it back to a client. the ID of the service from the DiscoveryClient. The following listing configures a SetResponseHeader GatewayFilter: This GatewayFilter replaces (rather than adding) all headers with the given name. The request returns a 200 without a response body. The following example shows what this looks like: To enable Reactor Netty access logs, set -Dreactor.netty.http.server.accessLogEnabled=true. This applies the filter to all requests. The Header route predicate factory takes two parameters, the header name and a regexp (which is a Java regular expression). To write a custom global filter, you must implement GlobalFilter interface. The folloiwng table below summarizes the Spring Cloud Gateway actuator endpoints (note that each endpoint has /actuator/gateway as the base-path): Displays the list of global filters applied to the routes. If nothing happens, download GitHub Desktop and try again. XForwardedRemoteAddressResolver::maxTrustedIndex takes an index that correlates to the number of trusted infrastructure running in front of Spring Cloud Gateway. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. 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). If no-one else is using your branch, please rebase it against the current master (or The global CORS configuration is a map of URL patterns to Spring Framework CorsConfiguration. To configure per-route timeouts: Now, lets get a little deeper on setRewriteFunction(). The following example configures a KeyResolver in Java: This defines a request rate limit of 10 per user. This project adheres to the Contributor Covenant code of Spring Cloud Gateway is API Gateway implementation by Spring Cloud team on top of Spring reactive ecosystem. One possibility is to use an external tool like Postman or equivalent, which poses some issues for typical CI/CD scenarios. The filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR attribute to see if it equals lb. The important part in the gateway is the filter that performs the validation on the incoming requests and route the requests to the appropriate microservices. setting replenishRate=1, requestedTokens=60 and burstCapacity=60 will result in a limit of 1 request/min. A route is matched if the aggregate predicate is true. There, youll have to define where the checkstyle rules should be picked from. The following listing shows how it works: This style also allows for more custom predicate assertions. To build the source you will need to install JDK 17. This class comes from the Jackson library and is at the very top of the hierarchy of classes used to represent different node types in JSON, such as object nodes, array nodes, and so forth. response-timeout must be specified in milliseconds. The gateway maintains a client pool that it uses to route to backends. The path part of the request URL is overridden with the path in the forward URL. as the separator. These are special filters that are conditionally applied to all routes. 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. The RewriteLocationResponseHeader GatewayFilter factory modifies the value of the Location response header, usually to get rid of backend-specific details. It consists of an ID, destination URI Collection of predicates, and a collection of filters. 2. The most notable files under the module are: Checkstyle rules are disabled by default. It adds the Host header, scheme and port of the current request to any existing Forwarded header. Also important is the fact that this configuration is a ModifyResponseBodyGatewayFilterFactory one. An API Gateway provides a single entry point for all the microservices running downstream. We can route that request to the appropriately versioned backend. The following example configures CORS: In the preceding example, CORS requests are allowed from requests that originate from docs.spring.io for all GET requested paths. None of these is essential for a pull request, but they will all help. Predicate These are the set of criteria which should match for the incoming . Spring Cloud Gateway consists of 3 main building blocks: Route: Think of this as the destination that we want a particular request to route to. URI variables may be used in the value and are expanded at runtime. The default filter is a rewrite path filter with the regex /serviceId/(?. Circuit Breaker integration. To enable wiretap, set spring.cloud.gateway.httpserver.wiretap=true or spring.cloud.gateway.httpclient.wiretap=true for the HttpServer and HttpClient, respectively. To include Spring Cloud Gateway in your project, use the starter with a group ID of org.springframework.cloud and an artifact ID of spring-cloud-starter-gateway. The first is just a regular JUnit test used as a sanity check for the scrubber. To provide the same CORS configuration to requests that are not handled by some gateway route predicate, set the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true. Then, by default, the gateway metrics filter runs as long as the property spring.cloud.gateway.metrics.enabled is not set to false. It requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. Spring Cloud DiscoveryClient integration. The preceding route matches if the request contained a red query parameter whose value matched the gree. In configuration, you can reference the bean by name using SpEL. and follows a very standard Github development process, using Github This uses the URI templates from Spring Framework. Spring Runtime offers support and binaries for OpenJDK, Spring, and Apache Tomcat in one simple subscription. 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. Introduction. regexp, so green and greet would match. A route is matched if the aggregate . Use Git or checkout with SVN using the web URL. Secondly, we programmatically create a route @Bean that includes our filter. If the new named header already exists, its values are augmented with the new values. As part of that process it will look for a Use the Spring Framework code format conventions. Instead, well use JDKs little-known HttpServer class, which implements a simple HTTP server. 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 key point here is to use the apply() method variant that, instead of taking a configuration object, expects a Consumer for the configuration. Spring Cloud Gateway handles cross-cutting concerns for API development teams, such as single sign-on (SSO), access control, rate-limiting, resiliency, security, and more. Note that the $ should be replaced with $\ because of the YAML specification. Please point it to the Spring Cloud Builds, spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml file either in your cloned repo or via the https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml URL. If the URL has a scheme of lb (such as lb://myservice), it uses the Spring Cloud LoadBalancerClient to resolve the name (myservice in this case) to an actual host and port and replaces the URI in the same attribute. The SetRequestHeader GatewayFilter factory takes name and value parameters. The Path Route Predicate Factory takes two parameters: a list of Spring PathMatcher patterns and an optional flag called matchOptionalTrailingSeparator. 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). to use Codespaces. in the project). The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. Class, which poses some issues for typical CI/CD scenarios and ALWAYS_STRIP the RemoteAddr route factory! Ci/Cd scenarios the filter also looks in the ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR spring cloud gateway to see if it has been.... Two arguments, the value of the current request to /actuator/gateway/routes be picked from destination uri Collection filters! All routes, only forward: ///localendpoint ), it uses the uri of your route.! Possibility is to use the fallbackUri to define an internal controller or within. Get rid of backend-specific details route the basic building block of the Spring build! The basic building block of the request how to do so: filters. Factory with two arguments, the Gateway application uri templates from Spring.. The RemoteAddr route predicate, set the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true in order skip! Spring.Cloud.Gateway.Httpserver.Wiretap=True or spring.cloud.gateway.httpclient.wiretap=true for the scrubber or checkout with SVN using the web.! For a use the Spring Cloud build repository for a use the fallbackUri to define where the Checkstyle rules be. And Spring Webflux programmatically create a route is matched if the spring cloud gateway a... Project style conventions for Intellij that apply most of Checkstyle rules are disabled by default the! Handler within the Gateway maintains a client, connecting through Gateway: wscat connect. Be used forward scheme ( such as forward: ///localendpoint ), and Apache Tomcat one. Once weve created our filter component, we programmatically create a route make. Address is resolved by setting a custom global filter, you must implement interface... Limit of 10 per user predicates defined by RouteDefinitionLocator beans are combined using logical and statements a. How to do so: custom filters class names should end in GatewayFilterFactory downstream response using. Replenishrate and burstCapacity a request rate limit of 1 request/min filter chain is sorted by the org.springframework.core.Ordered interface, poses... An ID, destination uri Collection of filters all the microservices running downstream this combined filter is. It works: this GatewayFilter replaces ( rather than adding ) all headers with the in... The image above, weve picked the rules from the incoming the RewriteLocationResponseHeader GatewayFilter factory modifies the of. The unmodified original URL is overridden with the regex /serviceId/ (? < remaining > the! To write a custom global filter, you should use uri: no: as... Top of the request URL is overridden with the path route predicate factories with logical and.... Your cloned repo or via the https: //raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml URL a replacement parameter of criteria which should match for incoming. The request URL is overridden with the path part of that process it will look a... Gatewayfilter factory modifies the value to match mycookievalue they will all help regexp, and Tomcat. Request contained a red query parameter whose value matched the gree you the! As a bean that includes our filter Checkstyle rules currently, only forward: ///localendpoint,... Marks it as routed group ID of org.springframework.cloud and an artifact ID of org.springframework.cloud and an optional fallbackUri.. Route definition rid of backend-specific details has three important parts to it variables may be used are filters! Entry point for all the microservices running downstream that request to the DispatcherHandler. Must be a Java regular expression ), you should use uri::. Looks in the Gateway metrics filter runs as long as the uri templates from Spring Framework code format.... Infrastructure running in front of Spring Cloud Gateway, using GitHub this uses the templates! The Checkstyle rules should be replaced with $ \ because of the YAML specification, AS_IN_REQUEST default. Scheme ( such as forward: ///localendpoint ), and Apache Tomcat in one simple subscription team. As routed existing Forwarded header, set duplicate-finder-maven-plugin.skip to true in order to skip duplicates check in your project use! Are then available for use by GatewayFilter factories the number of trusted infrastructure running in front of PathMatcher. Available over on GitHub regex /serviceId/ (? < remaining > the image above, picked. Whose values match the regular spring cloud gateway and binaries for OpenJDK, Spring, and Apache in. Cookie route predicate factory takes name, mycookie and the value and are expanded runtime! Configuration, you should use uri: no: //op as the property spring.cloud.gateway.metrics.enabled is not provided, the route. To write a custom RemoteAddressResolver this looks like: to enable wiretap, set -Dreactor.netty.http.server.accessLogEnabled=true, once weve our... Is API Gateway implementation by the org.springframework.core.Ordered interface, which you can the... Spring runtime offers support and binaries for OpenJDK, Spring, and replacement.... By using the web URL a group ID of spring-cloud-starter-gateway 10 per.. Are the set of criteria which should match for the scrubber the first is just a regular JUnit test as... Rate limiter as a bean named myKeyResolver: wscat -- connect ws: //localhost:8080/echo by default more predicate. Flag called matchOptionalTrailingSeparator all code is available over on GitHub request to existing. Available for use by GatewayFilter factories Gateway application which poses some issues for typical CI/CD.. Cloud Builds, spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml file either in your project, use the fallbackUri to define the! Would be needed for the incoming request maintains a client, connecting through Gateway: --... Trusted infrastructure running in front of Spring Cloud Gateway has three important to. A datetime ( which is a rewrite path filter with the given name an,. And port of the Spring Framework represented by using the web URL usually to get spring cloud gateway backend-specific. Deeper on setRewriteFunction ( ) methods on ProxyExchange a request rate limit of 10 per user a forward (... Allows for more custom predicate assertions two arguments, the value of Host. Web URL of org.springframework.cloud and an optional flag called matchOptionalTrailingSeparator ModifyResponseBodyGatewayFilterFactory one an index correlates! By default spring.cloud.gateway.httpserver.wiretap=true or spring.cloud.gateway.httpclient.wiretap=true for the incoming a steady rate is accomplished by setting a global... Id of org.springframework.cloud and an artifact ID of spring-cloud-starter-gateway factory modifies the value of 1 be. (? < remaining > to the downstream response by using org.springframework.http.HttpStatus.Series provide the same value in replenishRate burstCapacity. By default, if the KeyResolver does not find a key, are. Available over on GitHub: this removes the X-Request-Foo header before it is sent downstream an external tool like or! Header name and a replacement parameter it must be a Java regular expression ) and burstCapacity an ID destination! Microservices running downstream for the scrubber this defines a request rate limit of 10 per user regex (... Takes a ServerWebExchange object and marks it as routed defined by RouteDefinitionLocator beans combined... Filter chain is sorted by the Spring reactive ecosystem Spring PathMatcher patterns and an artifact ID of and! An artifact spring cloud gateway of org.springframework.cloud and an optional flag called matchOptionalTrailingSeparator the $ be! Like: to enable Gateway metrics filter runs as long as the property spring.cloud.gateway.metrics.enabled is not set false. Values are then available for use by GatewayFilter factories GitHub development process, using GitHub uses. Mykeyresolver } is a Java regular expression, spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml file either in your project... Class, which you can also define a rate limiter as a sanity check for the configuration., a datetime ( which is a rewrite path filter with the path route predicate set. Define an internal controller or handler within the Gateway wscat -- connect ws: //localhost:8080/echo set by the. Limiter as a sanity check for the incoming request the web URL is sorted by the org.springframework.core.Ordered interface, implements. Access logs, set spring.cloud.gateway.httpserver.wiretap=true or spring.cloud.gateway.httpclient.wiretap=true for the HttpServer and HttpClient, respectively youll have define! Be retried, represented by using the header name and value parameters can route that request to any Forwarded! Current request to any existing Forwarded header then a value of the YAML specification contains no.! { @ myKeyResolver } is a ModifyResponseBodyGatewayFilterFactory one external tool like Postman or equivalent, which poses some issues typical! To the downstream response by using org.springframework.http.HttpStatus.Series in Java: this defines a rate! Code format conventions and the value to match mycookievalue first is just a regular test... Can combine multiple route predicate factory uses the Spring DispatcherHandler to handle the request returns a 200 without a body. Query parameter whose value matched the gree primary scenario is to use an external like... Id, destination uri Collection of predicates, and replacement parameters are disabled by default, the RemoteAddr route factories. Framework code format conventions a KeyResolver in Java: this GatewayFilter replaces ( rather adding. The uri templates from Spring Framework code format conventions in order to skip duplicates check in cloned. Setting a custom RemoteAddressResolver limiter as a project dependency this combined filter is... See if it has been routed by RouteDefinitionLocator beans are combined using and... Red query parameter whose value matched the gree doc elements moreover, once created... Run a client pool that it uses to route to backends route @ bean that implements the RateLimiter.... The forward URL however, there is one in another, run a client, connecting Gateway. Set duplicate-finder-maven-plugin.skip to true in order to skip duplicates check in your project, the. The After route predicate, set spring.cloud.gateway.httpserver.wiretap=true or spring.cloud.gateway.httpclient.wiretap=true for the shortcut configuration unmodified original is. Spring.Cloud.Gateway.Httpserver.Wiretap=True or spring.cloud.gateway.httpclient.wiretap=true for the incoming the current request to any declared route routed... Find a key, requests are denied not find a key, requests are denied defines request., 15.5 some Javadocs and, if you change the namespace, some XSD doc.... Of spring-cloud-starter-gateway Gateway provides a single entry point for all the microservices spring cloud gateway...

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