Allow setting user agent for http tracker client

Author: trym

client.js

@@ -53,6 +53,7 @@ function Client (peerId, port, torrent, opts) {
 
   self._rtcConfig = opts.rtcConfig
   self._wrtc = opts.wrtc
+  self._userAgent = opts.userAgent
 
   debug('new client %s', self._infoHashHex)
 

lib/client/http-tracker.js

@@ -86,10 +86,15 @@ HTTPTracker.prototype.destroy = function (cb) {
 
 HTTPTracker.prototype._request = function (requestUrl, params, cb) {
   var self = this
-  var u = requestUrl + (requestUrl.indexOf('?') === -1 ? '?' : '&') +
+  var headers = {}
+  var url = requestUrl + (requestUrl.indexOf('?') === -1 ? '?' : '&') +
     common.querystringStringify(params)
 
-  get.concat(u, function (err, data, res) {
+  if (self.client._userAgent) {
+    headers['User-Agent'] = self.client._userAgent
+  }
+
+  get.concat({ url: url, headers: headers }, function (err, data, res) {
     if (self.destroyed) return
     if (err) return self.client.emit('warning', err)
     if (res.statusCode !== 200) {