[英]How can I get the raw download size of a request using Puppeteer?
也就是說,跨所有資源(包括視頻/媒體)下載的數據總量,類似於 Chrome DevTools 的“網絡”選項卡返回的數據量。
截至 2018 年 1 月,似乎沒有任何方法可以使用所有資源類型(偵聽視頻的response
事件失敗),並且可以正確計算壓縮資源。
最好的解決方法似乎是監聽Network.dataReceived
事件,並手動處理該事件:
const resources = {};
page._client.on('Network.dataReceived', (event) => {
const request = page._networkManager._requestIdToRequest.get(
event.requestId
);
if (request && request.url().startsWith('data:')) {
return;
}
const url = request.url();
// encodedDataLength is supposed to be the amount of data received
// over the wire, but it's often 0, so just use dataLength for consistency.
// https://chromedevtools.github.io/devtools-protocol/tot/Network/#event-dataReceived
// const length = event.encodedDataLength > 0 ?
// event.encodedDataLength : event.dataLength;
const length = event.dataLength;
if (url in resources) {
resources[url] += length;
} else {
resources[url] = length;
}
});
// page.goto(...), etc.
// totalCompressedBytes is unavailable; see comment above
const totalUncompressedBytes = Object.values(resources).reduce((a, n) => a + n, 0);
如果您使用的是 puppeteer,那么您有服務器端節點...為什么不通過流或流來管道請求,然后計算內容大小?
還有https://github.com/watson/request-stats
您也可能想調用 page.waitForNavigation 因為您可能正在處理異步時間問題
@mjs的解決方案即使在2021年也能完美運行。只需要替換:
page._networkManager -> 頁面。 _frameManager ._networkManager
對我有用的完整示例:
const resources = {};
page._client.on('Network.dataReceived', (event) => {
const request = page._frameManager._networkManager._requestIdToRequest.get(
event.requestId
);
if (request && request.url().startsWith('data:')) {
return;
}
const url = request.url();
const length = event.dataLength;
if (url in resources) {
resources[url] += length;
} else {
resources[url] = length;
}
});
await page.goto('https://stackoverflow.com/questions/48263345/how-can-i-get-the-raw-download-size-of-a-request-using-puppeteer');
const totalUncompressedBytes = Object.values(resources).reduce((a, n) => a + n, 0);
console.log(totalUncompressedBytes);
const imgaes_width = await page.$$eval('img', anchors => [].map.call(anchors, img => img.width));
const imgaes_height = await page.$$eval('img', anchors => [].map.call(anchors, img => img.height));
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