missing self reference

Author: felicienfrancois

lib/proxy.js

@@ -472,7 +472,7 @@ Proxy.prototype._onWebSocketServerConnect = function(isSSL, ws) {
   }
   ctx.proxyToServerWebSocketOptions = {
     url: url,
-    agent: ctx.isSSL ? httpsAgent : httpAgent,
+    agent: ctx.isSSL ? self.httpsAgent : self.httpAgent,
     headers: ptosHeaders
   };
   return self._onWebSocketConnection(ctx, function(err) {
@@ -579,7 +579,7 @@ Proxy.prototype._onHttpServerRequest = function(isSSL, clientToProxyRequest, pro
     host: hostPort.host,
     port: hostPort.port,
     headers: ctx.clientToProxyRequest.headers,
-    agent: ctx.isSSL ? httpsAgent : httpAgent
+    agent: ctx.isSSL ? self.httpsAgent : self.httpAgent
   };
   return self._onRequest(ctx, function(err) {
     if (err) {