Fix incorrect manipulation with streams resulting in exceptions.

Author: akacdev

AbuseIPDB/API.cs

@@ -51,6 +51,7 @@ public static async Task<HttpResponseMessage> Request
             else req.Content = content;
 
             HttpResponseMessage res = await cl.SendAsync(req);
+            content?.Dispose();
 
             MediaTypeHeaderValue contentType = res.Content.Headers.ContentType;
             if (!absoluteUrl && contentType.MediaType != "application/json")

AbuseIPDB/Extensions.cs

@@ -39,11 +39,12 @@ public static async Task<T> Deseralize<T>(this HttpResponseMessage res, JsonSeri
         /// <param name="options">Optional JSON serialization options object.</param>
         public static async Task<StreamContent> Serialize(this object obj, JsonSerializerOptions options = null)
         {
-            using MemoryStream ms = new();
+            MemoryStream ms = new();
             await JsonSerializer.SerializeAsync(ms, obj, options);
+            ms.Position = 0;
 
             StreamContent sc = new(ms);
-            sc.Headers.ContentType = new("application/json; charset=utf-8");
+            sc.Headers.ContentType = new("application/json");
 
             return sc;
         }