2 const PassThrough = require('stream').PassThrough;
3 const zlib = require('zlib');
5 module.exports = res => {
6 // TODO: use Array#includes when targeting Node.js 6
7 if (['gzip', 'deflate'].indexOf(res.headers['content-encoding']) === -1) {
11 const unzip = zlib.createUnzip();
12 const stream = new PassThrough();
14 stream.httpVersion = res.httpVersion;
15 stream.headers = res.headers;
16 stream.rawHeaders = res.rawHeaders;
17 stream.trailers = res.trailers;
18 stream.rawTrailers = res.rawTrailers;
19 stream.setTimeout = res.setTimeout.bind(res);
20 stream.statusCode = res.statusCode;
21 stream.statusMessage = res.statusMessage;
22 stream.socket = res.socket;
24 unzip.on('error', err => {
25 if (err.code === 'Z_BUF_ERROR') {
30 stream.emit('error', err);
33 res.pipe(unzip).pipe(stream);