[FIXED] Spring Cloud APIGW, Spring Boot and OpenAPI issue - CORS issue

Issue

I am using Spring Boot and Microservices stack using Spring Cloud APIGW. I am using the same code mentioned here: https://piotrminkowski.com/2020/02/20/microservices-api-documentation-with-springdoc-openapi/

When I hit any endpoint, I dont see response is coming and getting below error.

Access to fetch at 'http://192.168.0.2:49382/' from origin 'http://localhost:8060' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

Source code: https://github.com/piomin/sample-spring-microservices-new

Solution

I was able to fix it by myself looking at suggestion here: Spring Cloud Gateway and Springdoc OpenAPi integration and https://github.com/springdoc/springdoc-openapi/issues/1144

I had to add below in apigw-service in application.properties file

server:
  forward-headers-strategy: framework

Also, in each microservice, you need to add below bean

@Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {

            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").allowedMethods("HEAD", "GET", "PUT", "POST", "DELETE", "PATCH");
            }
        };
    }

Answered By - PAA
Answer Checked By - Robin (JavaFixing Admin)