http: use an unref'd timer to fix delay in exit

There was previously up to a second exit delay when exiting node
right after an http request/response, due to the utcDate() function
doing a setTimeout to update the cached date/time.

Fixing this should increase the performance of our http tests.

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/http.js b/lib/http.js
index ab36cd749..2dc1dabb0 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -22,6 +22,7 @@
 var util = require('util');
 var net = require('net');
 var Stream = require('stream');
+var timers = require('timers');
 var url = require('url');
 var EventEmitter = require('events').EventEmitter;
 var FreeList = require('freelist').FreeList;
@@ -274,12 +275,14 @@ function utcDate() {
   if (!dateCache) {
     var d = new Date();
     dateCache = d.toUTCString();
-    setTimeout(function() {
-      dateCache = undefined;
-    }, 1000 - d.getMilliseconds());
+    timers.enroll(utcDate, 1000 - d.getMilliseconds());
+    timers._unrefActive(utcDate);
   }
   return dateCache;
 }
+utcDate._onTimeout = function() {
+  dateCache = undefined;
+};
 
 
 /* Abstract base class for ServerRequest and ClientResponse. */