如何使用Puppeteer和Chrome DevTools协议修改请求标头? (可能是JS语法问题)

时间:2019-08-21 17:57:39

标签: javascript node.js typescript puppeteer chrome-devtools-protocol

我具有以下Typescript函数,假定已经使用Puppeteer启动了Chrome浏览器。可以在here中找到下面使用的Fetch函数的文档。

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):无效的参数标头:需要数组

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?

1 个答案:

答案 0 :(得分:1)

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需要一个Array<{name: string, value: string}>。例如

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

您可以使用Puppeteer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;
}