add remote page loading

src/asset.cpp

@@ -186,6 +186,7 @@ bool Asset::open_url(const std::string& url, std::function<bool(float)> progress
         curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &tmp_data);
         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_data_handler_asset);
+        curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1L);
 #ifdef __ANDROID__
         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
 #endif
@@ -221,7 +222,7 @@ std::future<bool>& Asset::open_url_async(const std::string& url,
     m_stop_async = false;
     remote_future = std::async([this, url, progress, complete] {
         bool ok = open_url(url, progress);
-        if (ok && complete)
+        if (complete)
             complete(ok);
         return ok;
     });