fiber: 🤗 [Question]: CORS problems

Question Description

Hello, I’m getting Access to XMLHttRequest at ‘http://localhost:8080/api/v1/auth/login’ 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. Im using Fiber v2.42.0

However, I’m not getting this cors error when I switch to Echo framework. I see this is common in fiber but there isnt a clear answer to this cors issue in fiber and i tried using multiple cors configuration including the default in fiber made by others said to be working but it didnt for me. With Echo it hasnt been a problem at all:

	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
		AllowOrigins:     []string{"http://localhost:3000"},
		AllowHeaders:     []string{echo.HeaderOrigin, echo.HeaderContentType, echo.HeaderAccept},
		AllowMethods:     []string{http.MethodGet, http.MethodPut, http.MethodPost, http.MethodDelete, http.MethodOptions, http.MethodPatch},
		AllowCredentials: true,
	}))

I really appreciate the help. I don’t want to switch to Echo simply because of a cors issue in fiber. I like fiber very much. Thanks.

Code Snippet (optional)

app.Use(cors.New(cors.Config{
		AllowOrigins:     "http://localhost:3000",
		AllowHeaders:     "Accept, Origin, Content-Type",
		AllowMethods:     "GET,POST,HEAD,PUT,DELETE,PATCH,OPTIONS",
		AllowCredentials: true,
	}))

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