HarmonyOS 离线跨域，测试是否可以导入整个包，只映射一个入口

可以试下这种方式:

let url: string = event.request.getRequestUrl();
let host:string = "https://www.huawei.com/";
let pos: number = url.indexOf(host);
if(pos >= 0) {
  let length: number = host.length;
  let rawfileName: string = url.substring(pos + length);
  let type_index = rawfileName.lastIndexOf(".");
  if(type_index > 0) {
    let mimeType = rawfileName.substring(type_index+1);
    switch (mimeType) {
      case 'html': mimeType = "text/html"; break;
      case 'js': mimeType = "text/javascript"; break;
      case 'css': mimeType = "text/css"; break;
    }
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