spring-cloud-gateway | An example of using Spring cloud gateway | Microservice library

I have a scenario that I have some microservices, cloud gateway and eureka server. All microservices and cloud gateway registered on the eureka server. Cloud gateway will securing all the downstream services. When any user want to access the service first it will fill out the username and password for authentication on the cloud gateway. If the user will be authentic then it will access the service by the gateway route that is already set in application.properties file but I want when the user will authentic and access the service then I can also get user authentic credential in downstream services or microservices that are behind the cloud gateway. In other word I want to getting principle values that is set on the gateway in downstream service. So, After searching many days I got a Global Filter Implementation link but this filter code in Kotlin and I am not familiar with Kotlin, So unable to understand of this. I want to implement this in Java. Basically this filter for adding username and user roles to headers of downstream services request. How can I convert this filter into java.

Here is the Workflow

Here is the cloud gateway configuration

I have a React application based on Typescript which is hosted on my PC. I use Spring gateway to forward requests to another microservice. GET requests are working fine but for POST requests I get:

Access to XMLHttpRequest at 'http://1.1.1.1:8080/api/support/tickets/create' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I'm hitting this Spring Cloud Gateway issue: https://github.com/spring-cloud/spring-cloud-gateway/issues/229

Spring cloud configuration:

I'm trying to set up security for Webflux with OAuth2 to use it as a gateway. On the other hand I have my own Authorization Server. We can say that this is the structure I want to achieve:

The configuration is as follows:

WebFluxSecurityConfig.java

I have a React application based on Typescript which is hosted on my PC. I use Spring gateway to forward requests to another microservice. GET requests are working fine but for POST requests I get:

I've deployed an application in Kubernetes with two pods. If I directly invoke its Kubernetes service (http://app:8080) it will balance the requests between those two pods using round robin.

The actual runtime contains a Spring Cloud Gateway pod in front of the application, configured this way:

I am using springboot gateway for load balancing requests between my microservice

I'm trying to build a gateway with load balancer by using spring-cloud-gateway But when I hit gateway, it gives me 404 instead of routing me to the registered service in eureka

I don't want to use auto-discover feature, so I use manual routing instead.

my code is uploaded here : https://github.com/gry77/poc-spring-cloud-gateway

How can I fix it ?

I am using spring gateway implementation "org.springframework.cloud:spring-cloud-starter-gateway" as my project gateway, define the filter in application.properties like this:

I am trying to forward client certificate information from Spring Cloud Gateway to microservices behind it. I modified the Netty config and it is successfully requesting a client cert from the client, but I don't see it forwarding it to the microservice behind it. In Apache we used to use +ExportCertData which populated a handful of headers with the client certificate DN, validity time, etc. Does Spring Cloud Gateway have any out of the box functionality like this?

I found these 2 questions which seem similar, but neither had very explicit answers. spring cloud gateway forward client certificate and Does anyone have a simple example of implementing x509 mutual authentication in Spring Cloud Gateway/Spring WebFlux?