From 0449e2679f2b251871cf60151c689813aa21bfc9 Mon Sep 17 00:00:00 2001
From: Guillaume Nourry-Marquis <guillaume.nourry.marquis@gmail.com>
Date: Mon, 9 Feb 2015 13:28:18 -0500
Subject: [PATCH] Bypass proxy caching

Add a HTTP Header that prevents HTTP proxy from caching the download file. Tested with Bluecoat ProxySG in between.
---
 speedtest_cli.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/speedtest_cli.py b/speedtest_cli.py
index 105c390..93eb84b 100755
--- a/speedtest_cli.py
+++ b/speedtest_cli.py
@@ -178,7 +178,10 @@ class FileGetter(threading.Thread):
         self.result = [0]
         try:
             if (timeit.default_timer() - self.starttime) <= 10:
-                f = urlopen(self.url)
+                #XLASH 2015-02-09 This is to prevent Proxy Caching in the way
+                req = Request(self.url)
+                req.add_header('Cache-Control' , 'no-cache')
+                f = urlopen(req)
                 while 1 and not shutdown_event.isSet():
                     self.result.append(len(f.read(10240)))
                     if self.result[-1] == 0: