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| const express = require('express'); | |
| const app = express(); | |
| app.post('/file', (req, res, next) => { | |
| let first = true; | |
| req.on('data', chunk => { | |
| if (!first) { | |
| return; | |
| } | |
| console.log('file extension is', chunk.slice(1, 4).toString()); | |
| console.log('PNG width is', chunk.readUIntBE(16, 4)); | |
| console.log('PNG height is', chunk.readUIntBE(20, 4)); | |
| first = false; | |
| }); | |
| req.on('end', () => { | |
| res.send('done'); | |
| }) | |
| req.on('error', next); | |
| }); | |
| app.use((err, req, res, next) => { | |
| res.send('error' + JSON.stringify(err)); | |
| }); | |
| app.listen('3000'); |
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