从Node.js Stream写入多个文件

Question

我正在写一个简短的Node.js片段，它解析RSS提要，提取链接，将它们重新配置为我想要的PDF链接，然后写入这些文件。代码如下所示：

var https = require('https');
var fs = require('fs');
const Parser = require("rss-parser");
let parser = new Parser();

parser.parseURL("https://regulations.justia.com/regulations/fedreg?limit=20&mode=atom")
  .then((feed) => {
    const base = "https://docs.regulations.justia.com/entries"
    feed.items.forEach((item, i) => {

      // Parsing to create PDF link...
      const str = item.link;
      let dates = str.substring(50, 60);
      let newDates = dates.replace(/\//, "-").replace(/\//, "-");
      let ending = str.substring(61).replace(".html",".pdf");
      let fullString = `${base}/${newDates}/${ending}`;

      // Fetching and saving the PDF file....
      const file = fs.createWriteStream(`${item.title}.pdf`);
      const request = https.get(fullString, (res) => {
        res.pipe(file);
      });
    });
  })
  .catch((err) => console.log(err));

我现在遇到两个错误。

1）与我的可写流有关。当我尝试根据RSS提要中的item.title创建文件时，我每次都会收到此错误：

Error: ENOENT: no such file or directory, open 'Notice - Solicitation of Nominations for Appointment to the World Trade Center Health Program Scientific/Technical Advisory Committee (STAC).pdf'

这是否与项目标题中的括号或em-dash有关？如果没有，还有什么可能导致这个问题？

2）当我更改代码（将可写流命名为更简单的东西）时，我的代码将抛出以下错误：

Error: socket hang up
    at TLSSocket.onHangUp (_tls_wrap.js:1135:19)
    at Object.onceWrapper (events.js:313:30)
    at emitNone (events.js:111:20)
    at TLSSocket.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1056:12)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)

在我下载了大量PDF之后，通常会抛出此错误，但不是全部。在此示例中我可以更改哪些内容以克服这些错误？谢谢您帮忙！