tHSIS code will not work because the path option in the pdf() method is only used to specify the temporary file created during the PDF generation process. The actual PDF file will be saved in the default download directory. To set a fixed PDF name, you need to intercept the server's response and modify the Content-Disposition header. The following code shows how to do this:

const puppeteer = require('puppeteer'); (async () => { const browser = await puppeteer.launch(); const page = await browser.newPage(); await page.goto('https://example.com/pdf'); // 拦截服务器的响应。 page.on('response', response => { if (response.headers['content-type'] === 'application/pdf') { // 修改Content-Disposition头以设置固定的文件名。 response.headers['content-disposition'] = 'attachment; filename="custom.pdf"'; } }); // 下载PDF文件。 await page.pdf(); await browser.close(); })();