import { webview } from '@kit.ArkWeb';

@Entry
@Component
struct WebComponent {
  controller: webview.WebviewController = new webview.WebviewController();
  responseResource: WebResourceResponse = new WebResourceResponse();
  // 开发者自定义响应数据
  @State webData: string = '<!DOCTYPE html>\n' +
    '<html>\n' +
    '<head>\n' +
    '<title>intercept test</title>\n' +
    '</head>\n' +
    '<body>\n' +
    '<h1>intercept ok</h1>\n' +
    '</body>\n' +
    '</html>'

  build() {
    Column() {
      Web({ src: $rawfile('index1.html'), controller: this.controller })
        .onInterceptRequest((event) => {
          if (event) {
            console.info('url:' + event.request.getRequestUrl());
            // 拦截页面请求
            if (event.request.getRequestUrl() !== 'https://www.example.com/test.html') {
              return null;
            }
          }
          // 构造响应数据
          this.responseResource.setResponseData(this.webData);
          this.responseResource.setResponseEncoding('utf-8');
          this.responseResource.setResponseMimeType('text/html');
          this.responseResource.setResponseCode(200);
          this.responseResource.setReasonMessage('OK');
          return this.responseResource;
        })
    }
  }
}

被拦截后的页面

为自定义的JavaScript请求响应生成CodeCache：自定义请求响应的资源类型如果是JavaScript脚本，可以在响应头中添加“ResponseDataID”字段，Web内核读取到该字段后会为该JS资源生成CodeCache，加速JS执行，并且ResponseData如果有更新时必须更新该字段。不添加“ResponseDataID”字段的情况下默认不生成CodeCache。

在下面的示例中，Web组件通过拦截页面请求https://www.example.com/test.js，应用侧代码构建响应资源，在响应头中添加“ResponseDataID”字段，开启生成CodeCache的功能。

前端页面index2.html代码。

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
</head>
<body>

<div id="div-1">this is a test div</div>
<div id="div-2">this is a test div</div>
<div id="div-3">this is a test div</div>
<div id="div-4">this is a test div</div>
<div id="div-5">this is a test div</div>
<div id="div-6">this is a test div</div>
<div id="div-7">this is a test div</div>
<div id="div-8">this is a test div</div>
<div id="div-9">this is a test div</div>
<div id="div-10">this is a test div</div>
<div id="div-11">this is a test div</div>

<script src="https://www.example.com/test.js"></script>
</body>
</html>

应用侧代码。

import { webview } from '@kit.ArkWeb';

@Entry
@Component
struct WebComponent {
  controller: webview.WebviewController = new webview.WebviewController();
  responseResource: WebResourceResponse = new WebResourceResponse();
  // 开发者自定义响应数据（响应数据长度需大于等于1024才会生成codecache）
  @State jsData: string = 'let text_msg = "the modified content:version 0000000000001";\n' +
    'let element1 = window.document.getElementById("div-1");\n' +
    'let element2 = window.document.getElementById("div-2");\n' +
    'let element3 = window.document.getElementById("div-3");\n' +
    'let element4 = window.document.getElementById("div-4");\n' +
    'let element5 = window.document.getElementById("div-5");\n' +
    'let element6 = window.document.getElementById("div-6");\n' +
    'let element7 = window.document.getElementById("div-7");\n' +
    'let element8 = window.document.getElementById("div-8");\n' +
    'let element9 = window.document.getElementById("div-9");\n' +
    'let element10 = window.document.getElementById("div-10");\n' +
    'let element11 = window.document.getElementById("div-11");\n' +
    'element1.innerHTML = text_msg;\n' +
    'element2.innerHTML = text_msg;\n' +
    'element3.innerHTML = text_msg;\n' +
    'element4.innerHTML = text_msg;\n' +
    'element5.innerHTML = text_msg;\n' +
    'element6.innerHTML = text_msg;\n' +
    'element7.innerHTML = text_msg;\n' +
    'element8.innerHTML = text_msg;\n' +
    'element9.innerHTML = text_msg;\n' +
    'element10.innerHTML = text_msg;\n' +
    'element11.innerHTML = text_msg;\n';
  build() {
    Column() {
      Web({ src: $rawfile('index2.html'), controller: this.controller })
        .onInterceptRequest((event) => {
          // 拦截页面请求
          if (event?.request.getRequestUrl() == 'https://www.example.com/test.js') {
            // 构造响应数据
            this.responseResource.setResponseHeader([
              {
                // 格式：不超过13位纯数字。js识别码，Js有更新时必须更新该字段
                headerKey: 'ResponseDataID',
                headerValue: '0000000000001'
              }]);
            this.responseResource.setResponseData(this.jsData);
            this.responseResource.setResponseEncoding('utf-8');
            this.responseResource.setResponseMimeType('application/javascript');
            this.responseResource.setResponseCode(200);
            this.responseResource.setReasonMessage('OK');
            return this.responseResource;
          }
          return null;
        })
    }
  }
}

被拦截后的页面

目录

自定义页面请求响应