Use Error property when throwing exception

Refit.Tests/ResponseTests.cs

@@ -116,6 +116,44 @@ public async Task ThrowsValidationException()
             Assert.Equal("title", actualException.Content.Title);
             Assert.Equal("type", actualException.Content.Type);
         }
+
+        /// <summary>
+        /// Test to verify if EnsureSuccessStatusCodeAsync throws a ValidationApiException for a Bad Request in terms of RFC 7807
+        /// </summary>
+        [Fact]
+        public async Task When_BadRequest_EnsureSuccessStatusCodeAsync_ThrowsValidationException()
+        {
+            var expectedContent = new ProblemDetails
+            {
+                Detail = "detail",
+                Errors = { { "Field1", new string[] { "Problem1" } }, { "Field2", new string[] { "Problem2" } } },
+                Instance = "instance",
+                Status = 1,
+                Title = "title",
+                Type = "type"
+            };
+
+            var expectedResponse = new HttpResponseMessage(HttpStatusCode.BadRequest)
+            {
+                Content = new StringContent(JsonConvert.SerializeObject(expectedContent))
+            };
+
+            expectedResponse.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/problem+json");
+            mockHandler.Expect(HttpMethod.Get, "http://api/GetApiResponseTestObject")
+                .Respond(req => expectedResponse);
+
+            using var response = await fixture.GetApiResponseTestObject();
+            var actualException = await Assert.ThrowsAsync<ValidationApiException>(() => response.EnsureSuccessStatusCodeAsync());
+
+            Assert.NotNull(actualException.Content);
+            Assert.Equal("detail", actualException.Content.Detail);
+            Assert.Equal("Problem1", actualException.Content.Errors["Field1"][0]);
+            Assert.Equal("Problem2", actualException.Content.Errors["Field2"][0]);
+            Assert.Equal("instance", actualException.Content.Instance);
+            Assert.Equal(1, actualException.Content.Status);
+            Assert.Equal("title", actualException.Content.Title);
+            Assert.Equal("type", actualException.Content.Type);
+        }
 
         [Fact]
         public async Task WhenProblemDetailsResponseContainsExtensions_ShouldHydrateExtensions()

Refit/ApiResponse.cs

@@ -86,7 +86,7 @@ public async Task<ApiResponse<T>> EnsureSuccessStatusCodeAsync()
         {
             if (!IsSuccessStatusCode)
             {
-                var exception = await ApiException.Create(response.RequestMessage!, response.RequestMessage!.Method, response, Settings).ConfigureAwait(false);
+                var exception = Error ?? await ApiException.Create(response.RequestMessage!, response.RequestMessage!.Method, response, Settings).ConfigureAwait(false);
 
                 Dispose();