Merge pull request webtorrent#179 from zunsthy/feature-add-user-agent

add 'user-agent' in HTTP header

Author: feross

lib/client/http-tracker.js

@@ -89,8 +89,14 @@ HTTPTracker.prototype._request = function (requestUrl, params, cb) {
   var self = this
   var u = requestUrl + (requestUrl.indexOf('?') === -1 ? '?' : '&') +
     common.querystringStringify(params)
+  var opts = {
+    url: u,
+    header: {
+      'user-agent': self.client._userAgent || ''
+    }
+  }
 
-  get.concat(u, function (err, res, data) {
+  get.concat(opts, function (err, res, data) {
     if (self.destroyed) return
     if (err) return self.client.emit('warning', err)
     if (res.statusCode !== 200) {