[Go] CORS 支持多个 origin 访问的思路 (Access-Control-Allow-Origin 部分)

var allowOrigin string
allowOrigins := config.AppConf.Get("middleware.cors.allowOrigins").(string)

if strings.Contains(allowOrigins, "*") {
    allowOrigin = "*"
} else {
    origin := c.GetHeader("Origin")
    if strings.Contains(allowOrigins, origin) {
        allowOrigin = origin
    }
}

if allowOrigin != "" {
    c.Writer.Header().Set("Access-Control-Allow-Origin", allowOrigin)
}