gin.Default() didn't allow all origins actually

[Ianwu0812]

If we want to allow all origins on CORS policy, we will find the code block on gin.Default().

func Default() gin.HandlerFunc {
	config := DefaultConfig()
	config.AllowAllOrigins = true
	return New(config)
}

The code block contains config.AllowAllOrigins = true, so we thought we don't have to change anything for allowing all origin, but we found something weird. We have to set AllowWildCard = true or AllowAllOrigin will not work, because AllowAllOrigin passes wildcard(*) on preflight request.

Maybe we should remove config.AllowAllOrigins = true from gin.Default()?