don't forward proxy- headers

Author: felicienfrancois

lib/proxy.js

@@ -659,12 +659,19 @@ Proxy.prototype._onHttpServerRequest = function(isSSL, clientToProxyRequest, pro
   ctx.proxyToClientResponse.on('error', self._onError.bind(self, 'PROXY_TO_CLIENT_RESPONSE_ERROR', ctx));
   ctx.clientToProxyRequest.pause();
   var hostPort = Proxy.parseHostAndPort(ctx.clientToProxyRequest, ctx.isSSL ? 443 : 80);
+  var headers = {};
+  for (var h in ctx.clientToProxyRequest.headers) {
+    // don't forward proxy- headers
+    if (/^proxy\-/i.test(h)) {
+      headers[h] = ctx.clientToProxyRequest.headers[h];
+    }
+  }
   ctx.proxyToServerRequestOptions = {
     method: ctx.clientToProxyRequest.method,
     path: ctx.clientToProxyRequest.url,
     host: hostPort.host,
     port: hostPort.port,
-    headers: ctx.clientToProxyRequest.headers,
+    headers: headers,
     agent: ctx.isSSL ? self.httpsAgent : self.httpAgent
   };
   return self._onRequest(ctx, function(err) {