Resolve "use multi curl to improve performance"

Closes #19 (closed)

app/Http/Controllers/ProxyController.php

@@ -205,6 +205,7 @@ class ProxyController extends Controller
                     # It's an html document
                     $htmlDocument = new HtmlDocument($password, $targetUrl, $result["data"], $contentEncoding);
                     $htmlDocument->proxifyContent();
+                    $result['header']['content-type'] = $contentType . "; charset=" . $htmlDocument->getEncoding();
                     $result["data"] = $htmlDocument->getResult();
                     break;
                 case 'application/pdf':