Node.js 可写流挂起

Question

当写入次数较少（大约 10 次）时，响应结束。当写入次数超过 1000 时，则未达到 res.end() 并且请求处于挂起状态。有什么问题？

const pgp = require('pg-promise')();

const connection = {
  host: 'localhost',
  port: 5432,
  database: 'mydb',
  user: 'mydb_user',
  password: 'abcdef'
};
const db = pgp(connection);

const handler = async (req, res, next) => {

  res.set('Content-type', 'text/plain');
  res.set('Transfer-Encoding', 'chunked');

  for (let i = 0; i <= 500; i++) {
    for (let j = 0; j <= 500; j++) {
      let db_result = await db.any(`SELECT * FROM foo WHERE foo_id = ${i} AND bar_id = ${j};`);
      res.cork();
      res.write(JSON.stringify(db_result[0]));
      process.nextTick(() => res.uncork());
    }
  }

  res.end();
}

Answer 1

我想我找到了问题所在。在内部 for 循环中，我正在记录 db_result。看看here