如果出现错误，您不会发送任何响应，导致请求挂起并且永远不会返回。将其更改为例如：

function (err) {
    if (!err) {
        res.send("Successfully Updated The Data !");
    } else {
      console.log(err);
      res.status(500).send("Update failed due to error " + err.message);
    }  
}

app.route("/articles/:articleTitle")
    .put(async function (req, res) {
        try {
            await Article.updateMany(
                { title: req.params.articleTitle },
                { title: req.body.title, content: req.body.content },
                { overwrite: true },
            )
            res.status(200).send("Successfully Updated The Data !");
        } catch (err) {
            res.status(500).send("Update failed due to error " + err.message);
        }
    });

.put(function (req, res) {
    Article.updateMany(
      { title: req.params.articleTitle },
      { title: req.body.title, content: req.body.content }
    )
      .then(function (articles) {
        res.send(articles);
      })
      .catch(function (err) {
        res.send(err);
      });
  });