/
xz.js
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/
xz.js
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'use strict';
var CONFIG = require('config');
var lzma = require('lzma-native');
var util = require('./util');
var NAME = exports.name = 'xz';
var metrics = require('../metrics').session(NAME);
// Adds lzma compression for text/* if the agent accepts it
exports.handleResponse = function(request, source, dest) {
var headerMatch = {
'content-type': /(text\/|\/json|\/javascript|\/x-javascript)/,
'content-encoding': false
};
if (util.matchHeaders(request.headers, { 'accept-encoding': /xz/ }) &&
util.matchHeaders(source.headers, headerMatch)) {
metrics.count('hit');
// We are writing xz content
source.headers['content-encoding'] = 'xz';
// We do not know the length
delete source.headers['content-length'];
dest.writeHead(source.statusCode, source.headers);
source.pipe(lzma.createStream('easyEncoder',
{ preset: CONFIG.xz.level })).pipe(dest);
} else {
// Do nothing
metrics.count('miss');
source.forward(dest);
}
source.resume();
};