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我有以下 Typescript 函数，假设 Chrome 浏览器已经使用 Puppeteer 启动。下面使用的 Fetch 函数的文档可以在这里找到。

async function modify(client: CDPSession) {
    client.on('Fetch.requestPaused', async ({ requestId, request, frameId, resourceType, responseErrorReason, responseStatusCode, responseHeaders, networkId }) => {
        // Correctly prints out the User-Agent header's value
        console.log(request.headers["User-Agent"]);

        // After this line is run, I can inspect the request.headers object and see that User-Agent was successfully edited
        request.headers['User-Agent'] = 'trying to edit this header';

        // Continuing the request gives an error
        await client.send('Fetch.continueRequest', {
            requestId: requestId,
            headers: request.headers,
        });
    });
}

这是我看到的具体错误：

错误：协议错误（Fetch.continueRequest）：无效参数标头：预期数组

如何解决此错误并成功修改request.headers？这是我无法弄清楚的愚蠢的 Javascript/Typescript 语法问题吗？

4

1 回答 1

3

Fetch.requestPaused将标头作为对象返回。例如：

{
    "Upgrade-Insecure-Requests":"1",
    "Accept": "text/html,application/xhtml+xml"}
}

Fetch.continueRequest期望一个Array<{name: string, value: string}>. 例如

[
    {"name": "Accept", value: "text/html,application/xhtml+xml"}
]

您可以使用 Puppeteer 正在使用的代码：

function headersArray(headers) {
  const result = [];
  for (const name in headers) {
    if (!Object.is(headers[name], undefined))
      result.push({name, value: headers[name] + ''});
  }
  return result;
}
于 2019-08-21T18:11:19.720 回答