Use multipart HTTP request

HttpApiUploadPlugin/HttpApiUploadStorage.cs

@@ -30,16 +30,15 @@ public override async Task<StorageSaveResult> SaveImage(byte[] data, string shot
         return new StorageSaveResult(SavingResultCode.RequiresOptionsSetup, "API URL has to be set");
       }
 
-      var values = new Dictionary<string, string>
-      {
-        {"dataurl", GetDataURL(data, shotName)}
-      };
-
       try
       {
         using (var client = new HttpClient())
         {
-          var content = new FormUrlEncodedContent(values);
+          var content = new MultipartFormDataContent()
+          {
+            { new StringContent(GetDataURL(data, shotName)), "dataurl" }
+          };
+
           client.DefaultRequestHeaders.Accept.Clear();
           client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));
 

HttpApiUploadPlugin/SettingsControl.resx

@@ -121,7 +121,7 @@
     <value>17, 22</value>
   </metadata>
   <data name="helpTextLabel.Text" xml:space="preserve">
-    <value>This plugin sends HTTP POST request to the specified URL. 
+    <value>This plugin sends HTTP multipart POST request to the specified URL. 
 The only field is "dataurl" with Base64 encoded image contents.
 Accept of the request is "text/plain".
 

README.md

@@ -14,7 +14,7 @@ Built on [example plugin](https://github.com/name1ess0ne/CloudShot.Plugins/tree/
 
 ## API expectations
 
-This plugin sends a simple form-data HTTP POST request to the URL specified in plugin settings.
+This plugin sends a simple multipart HTTP POST request to the URL specified in plugin settings.
 The only field in the request is `dataurl` with Base64-encoded image contents.
 Accept header of the request is `text/plain`.