[FIXED] Use Spring Gateway and getting error: 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed

Issue

I am using Spring Gateway framework and configured as follows.

 gateway:
  default-filters:
    - DedupeResponseHeader=Access-Control-Allow-Origin
  globalcors:
    cors-configurations:
      '[/**]':
        allowedOrigins: "*"
        allowedMethods: "*"
        allowedHeaders: "*"

But when I try to execute a request on the gateway, I get the following error.

has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed.

I do not understand how to configure the configuration to avoid this error

Solution

Try with this configuration:

gateway:
      default-filters:
        - DedupeResponseHeader=Access-Control-Allow-Origin Access-Control-Allow-Credentials, RETAIN_UNIQUE
      globalcors:
          cors-configurations:
             '[/**]':
             allowed-origins: "*"
             allowed-methods: "*"
             allowed-headers: "*"
             allow-credentials: true

Answered By - Pablo Aragonés
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)