XMLHttpRequest cannot load http://xxx. Response for preflight has invalid HTTP status code 404
緣由1：最簡單的錯誤，路徑或者端口號不對java 緣由2：rest服務，路徑參數java程序雖然經過@PathParam註解更新了相應接口文件，可是忘記更新路徑參數@Path("xx/yy")，致使出現下面錯誤。後端 XMLHttpRequest cannot load http://127.0.0.1:21888/services/searchPromotionRestService/getEc
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