web组件如何设置请求头

// 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();

build() {
Column() {
Button('loadUrl')
.onClick(() => {
try {
// 带参数headers。
this.controller.loadUrl('www.example.com', [{ headerKey: "headerKey", headerValue: "headerValue" }]);
} catch (error) {
let e: business_error.BusinessError = error as business_error.BusinessError;
console.error(`ErrorCode: ${e.code}, Message: ${e.message}`);
}
})
Web({ src: 'www.example.com', controller: this.controller })
}
}
}