HarmonyOS 关于获取userAgent问题

demo如下：

// xxx.ets
import web_webview from '@ohos.web.webview'
import business_error from '@ohos.base'
@Entry
@Component
struct WebComponent {
  controller: web_webview.WebviewController = new web_webview.WebviewController();
  @State customUserAgent: string = 'test'
  build() {
    Column() {
      Button('setCustomUserAgent')
        .onClick(() => {
          try {
            let userAgent = this.controller.getUserAgent() + this.customUserAgent;
            this.controller.setCustomUserAgent(userAgent);
          } catch (error) {
            let e:business_error.BusinessError = error as business_error.BusinessError;
            console.error(`ErrorCode: ${e.code},  Message: ${e.message}`);
          }
        })
      Web({ src: 'XXX', controller: this.controller })
    }
  }
}

参考：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-webview-V5#setcustomuseragent10

目前只能通过web组件才能获取UserAgent，建议可以先获取后userAgent后，写成固定的，放入到请求的head中，再去掉web组件获取。