過(guò)濾器中已經(jīng)設(shè)置了        httpServletResponse.setHeader("Access-Control-Allow-Origin", httpServletRequest.getHeader("Origin"));        httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, OPTIONS");        httpServletResponse.setHeader("Access-Control-Max-Age", "0");        httpServletResponse.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token, Access-Control-Allow-Origin");        httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");        httpServletResponse.setHeader("XDomainRequestAllowed", "1");前端請(qǐng)求也加上了參數(shù)            xhrFields: {                withCredentials: true            },            crossDomain: true,返回結(jié)果也是200, 但是chrome報(bào)錯(cuò)了錯(cuò)誤The 'Access-Control-Allow-Origin' header has a value 'null' that is not equal to the supplied origin. Origin 'null' is therefore not allowed access.