在node.js中检索pdf的POST请求

const http = require('http');
const fs = require('fs');
const querystring = require('querystring');

const server = http.createServer((req, res) => {
  if (req.method === 'POST' && req.url === '/retrieve-pdf') {
    let body = '';
    req.on('data', (chunk) => {
      body += chunk;
    });
    req.on('end', () => {
      const params = querystring.parse(body);
      const pdfPath = retrievePDF(params); // 根据参数检索PDF文件路径
      if (pdfPath) {
        fs.readFile(pdfPath, (err, data) => {
          if (err) {
            res.statusCode = 500;
            res.end('Error reading PDF file');
          } else {
            res.setHeader('Content-Type', 'application/pdf');
            res.end(data);
          }
        });
      } else {
        res.statusCode = 404;
        res.end('PDF not found');
      }
    });
  } else {
    res.statusCode = 404;
    res.end('Not found');
  }
});

server.listen(3000, () => {
  console.log('Server listening on port 3000');
});

function retrievePDF(params) {
  // 根据参数检索PDF文件路径的具体实现
  // 可以使用文件系统操作、数据库查询等方法
  // 返回检索到的PDF文件路径或null
}