diff --git a/doc/compile-fixes.md b/doc/compile-fixes.md
index b860d2ec2..cc5a7b81e 100644
--- a/doc/compile-fixes.md
+++ b/doc/compile-fixes.md
@@ -65,24 +65,3 @@ and change to
 ```
 eventHandler.target.addEventListener(eventHandler.eventTypeString, jsEventHandler, { useCapture: eventHandler.useCapture, passive: false });
 ```
-
-#### Texture pack confirm dialog always shows *Download size: Determining*..
-Unfortunately emscripten doesn't store content-length for HEAD http requests. This can be fixed.
-
-First you need to find at what offset emscripten stores content-length. Look for something like:
-```
-xhr.onprogress = function(e) {
-...
-      Fetch.setu64(fetch + 32, e.total);
-```
-then look for
-```
-xhr.onload = function(e) {
-...
-```
-and finally change that to
-```
-xhr.onload = function(e) { 
-    Fetch.setu64(fetch + 32, e.total);
-...
-```
diff --git a/readme.md b/readme.md
index f13521f72..f2cfb63a4 100644
--- a/readme.md
+++ b/readme.md
@@ -124,7 +124,7 @@ NOTE: You have to change entry->d_type == DT_DIR to Directory_Exists(&path) (TOD
 
 #### Web
 
-```emcc *.c -s FETCH=1 -s ALLOW_MEMORY_GROWTH=1 --preload-file texpacks/default.zip```
+```emcc *.c -s ALLOW_MEMORY_GROWTH=1 --preload-file texpacks/default.zip```
 
 The generated javascript file has some issues. [See here for how to fix](doc/compile-fixes.md#webclient-patches)
 
diff --git a/src/Http.c b/src/Http.c
index e07363499..e626cf2be 100644
--- a/src/Http.c
+++ b/src/Http.c
@@ -354,17 +354,26 @@ static void Http_DownloadAsync(struct HttpRequest* req) {
 		var xhr = new XMLHttpRequest();
 		xhr.open(reqMethod, url);
 		xhr.responseType = 'arraybuffer';
+
+		var getContentLength = function(e) {
+			if (e.total) return e.total;
+
+			try {
+				var len = xhr.getResponseHeader('Content-Length');
+				return parseInt(len, 10);
+			} catch (ex) { return 0; }
+		};
 		
 		xhr.onload = function(e) {
 			var src  = new Uint8Array(xhr.response);
 			var len  = src.byteLength;
 			var data = _malloc(len);
 			HEAPU8.set(src, data);
-			onFinished(data, len || e.total, xhr.status);
+			onFinished(data, len || getContentLength(e), xhr.status);
 		};
-		xhr.onerror    = function(e) { onFinished(0, 0, xhr.status); };
-		xhr.ontimeout  = function(e) { onFinished(0, 0, xhr.status); };
-		xhr.onprogress = function(e) { onProgress(e.loaded, e.total);   };
+		xhr.onerror    = function(e) { onFinished(0, 0, xhr.status);  };
+		xhr.ontimeout  = function(e) { onFinished(0, 0, xhr.status);  };
+		xhr.onprogress = function(e) { onProgress(e.loaded, e.total); };
 
 		try { xhr.send(); } catch (e) { onFinished(0, 0, 0); }
 	}, urlStr, req->requestType, OnFinishedAsync, OnUpdateProgress);