XMLHttpRequest cannot load http://xxx. Response for preflight has invalid HTTP status code 404
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原因1：最简单的错误，路径或者端口号不对
原因2：rest服务，路径参数java程序虽然通过@PathParam注解更新了相应接口文件，但是忘记更新路径参数@Path("xx/yy")，导致出现下面错误。
XMLHttpRequest cannot load http://127.0.0.1:21888/services/searchPromotionRestService/getEchart. Response for preflight has invalid HTTP status code 404
原因3：rest服务 @Path("/edit/{id}")，但是传给后端的错误却传递了id为空的请求，比如xxxx/edit/
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