implement the Http method in publicapiinstance

Author: taooceros

Flow.Launcher/PublicAPIInstance.cs

@@ -17,6 +17,7 @@
 using Flow.Launcher.Plugin.SharedModel;
 using System.Threading;
 using System.IO;
+using Flow.Launcher.Infrastructure.Http;
 
 namespace Flow.Launcher
 {
@@ -134,12 +135,12 @@ public List<PluginPair> GetAllPlugins()
 
         public Task<string> HttpGetStringAsync(string url, CancellationToken token = default)
         {
-            return null;
+            return Http.GetAsync(url);
         }
 
         public Task<Stream> HttpGetStreamAsync(string url, CancellationToken token = default)
         {
-            return null;
+            return Http.GetStreamAsync(url);
         }
 
         #endregion