Data is now incompressible

README.md

-# Speedtest in 4k
+# HTML5 Speedtest
 
 No Flash, No Java, No Websocket, No Bullshit.
 
-This is a very small Speedtest implemented in Javascript, using XMLHttpRequest and Web Workers.
+This is a very lightweight Speedtest implemented in Javascript, using XMLHttpRequest and Web Workers.
 
 ## Try it
 [Take a Speedtest](http://speedtest.adolfintel.com)
@@ -13,9 +13,9 @@ Only modern browsers are supported (Edge 12+)
 ## Requirements
  - A reasonably fast web server
  - Some way to generate garbage data using either the included PHP script, a [big file of random data](http://downloads.adolfintel.com/geth.php?r=speedtest-bigfile), or a symlink to /dev/urandom
- - Your server must not compress the data it sends
  - Your server must accept large POST requests (up to 10 Megabytes), otherwise the upload test will fail
  - Client side, there must not be any type of buffering (such as a proxy), or you may get incorrect results
+ - It's also better if your server does not use compression, but it's not mandatory
 
 ## How to use
 See the examples, it's really simple.

garbage.php

 <?php
-// Disable Compression (would be too easy for 000...)
+// Disable Compression
 @ini_set('zlib.output_compression', 'Off');
 @ini_set('output_buffering', 'Off');
 @ini_set('output_handler', '');
@@ -15,8 +15,8 @@ header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
 header("Cache-Control: post-check=0, pre-check=0", false);
 header("Pragma: no-cache");
 // Generate data
-$data=str_repeat("0",1048575)."\n"; 
-// Deliver chunks of 1048576 bytes (or more - depending on encoding!)
+$data=openssl_random_pseudo_bytes(1048576,false);
+// Deliver chunks of 1048576 bytes
 while(1){
     echo $data;
     flush();

speedtest_worker.js

 var testStatus=0,dlStatus="",ulStatus="",pingStatus="";
-var settings={time_ul:15, time_dl:15, count_ping:35, url_dl:"garbage.php",url_ul:"empty.dat",url_ping:"empty.dat"};
+var settings={time_ul:15,time_dl:15,count_ping:35,url_dl:"garbage.php",url_ul:"empty.dat",url_ping:"empty.dat"};
 var xhr=null;
 this.addEventListener('message', function(e){
 	var params=e.data.split(" ");
 	if(params[0]=="status"){
 		postMessage(testStatus+";"+dlStatus+";"+ulStatus+";"+pingStatus);
 	}
-	if(params[0]=="start"){
-		if(testStatus==0){
-			testStatus=1;
-			try{
-				var s=JSON.parse(e.data.substring(5));
-				if(typeof s.url_dl != "undefined") settings.url_dl=s.url_dl;
-				if(typeof s.url_ul != "undefined") settings.url_ul=s.url_ul;
-				if(typeof s.url_ping != "undefined") settings.url_ping=s.url_ping;
-				if(typeof s.time_dl != "undefined") settings.time_dl=s.time_dl;
-				if(typeof s.time_ul != "undefined") settings.time_ul=s.time_ul;
-				if(typeof s.count_ping != "undefined") settings.count_ping=s.count_ping;
-			}catch(e){}
-			dlTest(function(){testStatus=2;ulTest(function(){testStatus=3;pingTest(function(){testStatus=4;});});});
-		}
+	if(params[0]=="start"&&testStatus==0){
+		testStatus=1;
+		try{
+			var s=JSON.parse(e.data.substring(5));
+			if(typeof s.url_dl != "undefined") settings.url_dl=s.url_dl;
+			if(typeof s.url_ul != "undefined") settings.url_ul=s.url_ul;
+			if(typeof s.url_ping != "undefined") settings.url_ping=s.url_ping;
+			if(typeof s.time_dl != "undefined") settings.time_dl=s.time_dl;
+			if(typeof s.time_ul != "undefined") settings.time_ul=s.time_ul;
+			if(typeof s.count_ping != "undefined") settings.count_ping=s.count_ping;
+		}catch(e){}
+		dlTest(function(){testStatus=2;ulTest(function(){testStatus=3;pingTest(function(){testStatus=4;});});});
 	}
 	if(params[0]=="abort"){
 		try{if(xhr)xhr.abort();}catch(e){}
 		testStatus=5;dlStatus="";ulStatus="";pingStatus="";
 	}
 });
-
 function dlTest(done){
     var firstTick=true,startT=new Date().getTime(), prevT=new Date().getTime(),prevLoaded=0,speed=0.0;
     xhr=new XMLHttpRequest();
@@ -54,10 +51,9 @@ function dlTest(done){
         xhr=null;
         done();
     }.bind(this);
-    xhr.open("GET", settings.url_dl+"?r="+Math.random(),true);
+    xhr.open("GET",settings.url_dl+"?r="+Math.random(),true);
     xhr.send();
 }
-
 function ulTest(done){
     var firstTick=true,startT=new Date().getTime(), prevT=new Date().getTime(),prevLoaded=0,speed=0.0;
     xhr=new XMLHttpRequest();
@@ -82,10 +78,12 @@ function ulTest(done){
         ulStatus="Fail";
         done();
     }.bind(this);
-    xhr.open("POST", settings.url_ul+"?r="+Math.random(),true);
-    xhr.send(new ArrayBuffer(10485760));
+    xhr.open("POST",settings.url_ul+"?r="+Math.random(),true);
+	xhr.setRequestHeader('Content-Encoding','identity');
+	var r=new ArrayBuffer(10485760);
+	try{var w=new Float32Array(r);for(var i=0;i<w.length;i++)w[i]=Math.random();}catch(e){}
+    xhr.send(r);
 }
-
 function pingTest(done){
     var prevT=null,ping=0.0,i=0;
     var doPing=function(){
@@ -110,4 +108,4 @@ function pingTest(done){
         xhr.send();
     }.bind(this);
     doPing();
-}
+}
\ No newline at end of file