使用Koa将远程图像流式传输到缓冲区

npm install request

const Koa = require('koa');
const request = require('request');

const app = new Koa();

app.use(async (ctx) => {
  const imageUrl = 'http://example.com/image.jpg'; // 远程图像URL
  const imageBuffer = await getImageBuffer(imageUrl); // 获取远程图像数据
  ctx.body = imageBuffer; // 将图像数据作为响应返回
});

function getImageBuffer(url) {
  return new Promise((resolve, reject) => {
    request.get(url, { encoding: null }, (error, response, body) => {
      if (error) {
        reject(error);
      } else {
        resolve(body);
      }
    });
  });
}

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});