跨域請求問題出現時往往伴隨以下報錯信息:
...has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
解決問題也很簡單,我是基於Java服務器:
@WebFilter("/*")
public class AccessControlAllowOriginFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletResponse response = (HttpServletResponse) res;
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
response.setHeader("Access-Control-Allow-Credentials", "true");
chain.doFilter(req, response);
}
public void init(FilterConfig filterConfig) {
}
public void destroy() {
}
}
然後將這個過濾器配置到項目中,上面是用註解進行配置