* 请求重定向 CustomService 参数 原因: 影像虚拟服务(Image MapService) 不提供"属性信息","几何信息","地理编码"等的功能,所以请求被重定向到其它的虚拟服务。 即: When sending a request other than GET_IMAGE to an image MapService,redirection is required; Redirection is achieved in action attribute of the PostForm: GET_FEATURES CustomService = Query GET_GEOCODE CustomService = Geocode GET_EXTRACT CustomService = Extract