Handles redirects to relative path (#11)

* Handles redirects to relative path

If url redirects to a relative url e.g. `/another_path` parse the url with previous protocol, host and port

* if no srcUrl.protocol, emit error

lib/wget.js

@@ -34,6 +34,10 @@ function download(src, output, options, _parentEvent, redirects) {
         };
     }
     srcUrl = url.parse(src);
+    if(!srcUrl.protocol) {
+        downloader.emit('error', 'Cannot parse url protocol for '+src);
+        return;
+    }
     srcUrl.protocol = cleanProtocol(srcUrl.protocol);
 
     req = request({
@@ -50,11 +54,17 @@ function download(src, output, options, _parentEvent, redirects) {
 
         // Handle 302 redirects
         if(res.statusCode === 301 || res.statusCode === 302 || res.statusCode === 307) {
+
+            var new_location=res.headers.location;
+            if(res.headers.location.indexOf('/')===0) {
+                new_location = srcUrl.protocol+'://'+srcUrl.hostname+(srcUrl.port? ':'+srcUrl.port:'')+res.headers.location;
+            }
+
             redirects++;
             if(redirects >= 10) {
                 downloader.emit('error', 'Infinite redirect loop detected');
             }
-            download(res.headers.location, output, options, downloader, redirects);
+            download(new_location, output, options, downloader, redirects);
         }
 
         if (res.statusCode === 200) {