XMLHttpRequest cannot load http://xxx. Response for preflight has invalid HTTP status code 404
缘由1：最简单的错误，路径或者端口号不对java 缘由2：rest服务，路径参数java程序虽然经过@PathParam注解更新了相应接口文件，可是忘记更新路径参数@Path("xx/yy")，致使出现下面错误。后端 XMLHttpRequest cannot load http://127.0.0.1:21888/services/searchPromotionRestService/getEc
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