Update Json Deserialization

src/FluentHttpClient.Tests/IntegrationTests.cs

@@ -0,0 +1,31 @@
+namespace FluentHttpClient.Tests;
+
+public class IntegrationTests
+{
+    [Fact]
+    public async Task ReadJsonAsync_ShouldReturnDeserializedObjectMultipleTimes()
+    {
+        var client = new HttpClient
+        {
+            BaseAddress = new Uri("https://jsonplaceholder.typicode.com")
+        };
+
+        var response = await client
+            .UsingRoute("posts/1")
+            .GetAsync();
+
+        var post1 = await response.ReadJsonAsync<Post>();
+        var post2 = await response.ReadJsonAsync<Post>();
+
+        post1.ShouldNotBeNull();
+        post2.ShouldNotBeNull();
+    }
+}
+
+public sealed class Post
+{
+    public int Id { get; set; }
+    public int UserId { get; set; }
+    public string? Title { get; set; }
+    public string? Body { get; set; }
+}

src/FluentHttpClient/FluentJsonDeserialization.cs

@@ -89,16 +89,16 @@ public static class FluentJsonDeserialization
         }
 
 #if NET5_0_OR_GREATER
-        var stream = await response.Content
-            .ReadAsStreamAsync(cancellationToken)
+        var json = await response.Content
+            .ReadAsStringAsync(cancellationToken)
             .ConfigureAwait(false);
 #else
-        var stream = await response.Content
-            .ReadAsStreamAsync()
+        var json = await response.Content
+            .ReadAsStringAsync()
             .ConfigureAwait(false);
 #endif
 
-        return JsonDocument.Parse(stream, documentOptions);
+        return JsonDocument.Parse(json, documentOptions);
     }
 
     /// <summary>

src/FluentHttpClient/FluentJsonTypedDeserialization.cs

@@ -84,25 +84,23 @@ public static partial class FluentJsonTypedDeserialization
         // NOTE: HttpResponseMessage.Content is never null on modern TFMs, but can be on older platforms.
         // These checks exist for cross-target safety and are not hit in current test runs.
         if (response.Content is null)
-        {
             return default;
-        }
 
         options ??= FluentJsonSerializer.DefaultJsonSerializerOptions;
 
 #if NET5_0_OR_GREATER
-        var stream = await response.Content
-            .ReadAsStreamAsync(cancellationToken)
+        var json = await response.Content
+            .ReadAsStringAsync(cancellationToken)
             .ConfigureAwait(false);
 #else
-        var stream = await response.Content
-            .ReadAsStreamAsync()
+        var json = await response.Content
+            .ReadAsStringAsync()
             .ConfigureAwait(false);
 #endif
 
-        return await JsonSerializer
-            .DeserializeAsync<T>(stream, options, cancellationToken)
-            .ConfigureAwait(false);
+        return cancellationToken.IsCancellationRequested
+            ? throw new OperationCanceledException(cancellationToken)
+            : JsonSerializer.Deserialize<T>(json, options);
     }
 
     /// <summary>