如何给页面URL附加HTTP请求头

import webview from '@ohos.web.webview' 
@Entry 
@Component 
struct Index { 
  private controller: webview.WebviewController = new webview.WebviewController() 
  private hasCustomHeader: Set<string> = new Set() 
  build() { 
    Column() { 
      Web({ src: 'https://www.baidu.com', controller: this.controller }) 
        .domStorageAccess(true) 
        .onUrlLoadIntercept((event) => { 
          const url = event.data as string 
          if (this.hasCustomHeader.has(url)) { 
            this.hasCustomHeader.delete(url) 
            return false 
          } 
          this.controller.loadUrl(url, [{ 
            headerKey: 'test', 
            headerValue: '123456' 
          }]) 
          this.hasCustomHeader.add((url)) 
          return true 
        }) 
    } 
    .width('100%') 
    .height('100%') 
  } 
}