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Sometimes CORS works with WebAPI, sometimes

I used the following:

http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api

As suggested here:

Enabling CORS with PUT / POST requests in WebAPI?

to enable cross-contour AJAX requests in my project. Everything (POST / PUT / DELETE / GET) worked yesterday. Then I decided to add a new endpoint to my webAPI project, and this one does not work with:

> XMLHttpRequest cannot load http://localhost:24144/api/card. Origin > http://localhost:11089 is not allowed by Access-Control-Allow-Origin.

In my WebApiConfig, I did this:

  var cors = new EnableCorsAttribute("http://localhost:11089", "*", "*"); config.EnableCors(cors);

And my AJAX request, identical to the other working ones, looks like this:

  var updateCard = function (data) { var options = { url: apiEndpoint + 'card', type: 'PUT', async: true, dataType: 'json', data: data, xhrFields: { withCredentials: true } }; return $.ajax(options) .done(function (response) { toastr.success("Card Updated", "Success"); }) .fail(function (msg) { toastr.error("Could not update card.", "Error"); }); } };

Even if you use the attribute directly on a method or controller that does not work, I get the same error:

  [EnableCors(origins: "http://localhost:11089", headers: "*", methods: "*")]

Why is this happening? I noticed that if I kill the solution for the web application during debugging, I get the same error in the client, but usually this happens only once, and the expected behavior is resumed using the WebAPI project. This is not a problem, but perhaps it is relevant.

If anything else you think I should provide here, let me know.

Update: Stack:

  iisexpress.exe Information: 0 : Request, Method=OPTIONS, Url=http://localhost:24144/api/card, Message='http://localhost:24144/api/card' iisexpress.exe Information: 0 : Message='Card', Operation=DefaultHttpControllerSelector.SelectController iisexpress.exe Information: 0 : Message='Selected action 'UpdateCard(CardDto card)'', Operation=ApiControllerActionSelector.SelectAction iisexpress.exe Information: 0 : Message='CorsPolicyProvider selected: 'System.Web.Http.Cors.EnableCorsAttribute'', Operation=AttributeBasedPolicyProviderFactory.GetCorsPolicyProvider iisexpress.exe Information: 0 : Message='CorsPolicy selected: 'AllowAnyHeader: True, AllowAnyMethod: True, AllowAnyOrigin: False, PreflightMaxAge: null, SupportsCredentials: False, Origins: {http://localhost:11089}, Methods: {}, Headers: {}, ExposedHeaders: {}'', Operation=EnableCorsAttribute.GetCorsPolicyAsync iisexpress.exe Information: 0 : Message='CorsResult returned: 'IsValid: True, AllowCredentials: False, PreflightMaxAge: null, AllowOrigin: http://localhost:11089, AllowExposedHeaders: {}, AllowHeaders: {accept,origin,content-type}, AllowMethods: {PUT}, ErrorMessages: {}'', Operation=CorsEngine.EvaluatePolicy iisexpress.exe Information: 0 : Operation=CorsMessageHandler.SendAsync, Status=200 (OK) iisexpress.exe Information: 0 : Response, Status=200 (OK), Method=OPTIONS, Url=http://localhost:24144/api/card, Message='Content-type='none', content-length=unknown' iisexpress.exe Information: 0 : Request, Method=PUT, Url=http://localhost:24144/api/card, Message='http://localhost:24144/api/card' iisexpress.exe Information: 0 : Message='Card', Operation=DefaultHttpControllerSelector.SelectController iisexpress.exe Information: 0 : Message='App.Service.Controllers.CardController', Operation=DefaultHttpControllerActivator.Create iisexpress.exe Information: 0 : Message='App.Service.Controllers.CardController', Operation=HttpControllerDescriptor.CreateController iisexpress.exe Information: 0 : Message='Selected action 'UpdateCard(CardDto card)'', Operation=ApiControllerActionSelector.SelectAction iisexpress.exe Information: 0 : Operation=AuthorizeAttribute.OnAuthorization iisexpress.exe Information: 0 : Message='Value read='App.Repository.Models.Dtos.CardDto'', Operation=JQueryMvcFormUrlEncodedFormatter.ReadFromStreamAsync iisexpress.exe Information: 0 : Message='Parameter 'card' bound to the value 'App.Repository.Models.Dtos.CardDto'', Operation=FormatterParameterBinding.ExecuteBindingAsync iisexpress.exe Information: 0 : Message='Model state is valid. Values: card=App.Repository.Models.Dtos.CardDto', Operation=HttpActionBinding.ExecuteBindingAsync A first chance exception of type 'System.Data.Entity.Validation.DbEntityValidationException' occurred in EntityFramework.dll iisexpress.exe Information: 0 : Message='Will use same 'JsonMediaTypeFormatter' formatter', Operation=JsonMediaTypeFormatter.GetPerRequestFormatterInstance iisexpress.exe Information: 0 : Message='Selected formatter='JsonMediaTypeFormatter', content-type='application/json; charset=utf-8'', Operation=DefaultContentNegotiator.Negotiate iisexpress.exe Information: 0 : Message='Action returned 'StatusCode: 500, ReasonPhrase: 'Internal Server Error', Version: 1.1, Content: System.Net.Http.ObjectContent`1[[System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], Headers: { Content-Type: application/json; charset=utf-8 }'', Operation=ReflectedHttpActionDescriptor.ExecuteAsync iisexpress.exe Information: 0 : Operation=ApiControllerActionInvoker.InvokeActionAsync, Status=500 (InternalServerError) iisexpress.exe Information: 0 : Operation=CardController.ExecuteAsync, Status=500 (InternalServerError) iisexpress.exe Information: 0 : Message='CorsPolicyProvider selected: 'System.Web.Http.Cors.EnableCorsAttribute'', Operation=AttributeBasedPolicyProviderFactory.GetCorsPolicyProvider iisexpress.exe Information: 0 : Message='CorsPolicy selected: 'AllowAnyHeader: True, AllowAnyMethod: True, AllowAnyOrigin: False, PreflightMaxAge: null, SupportsCredentials: False, Origins: {http://localhost:11089}, Methods: {}, Headers: {}, ExposedHeaders: {}'', Operation=EnableCorsAttribute.GetCorsPolicyAsync iisexpress.exe Information: 0 : Message='CorsResult returned: 'IsValid: True, AllowCredentials: False, PreflightMaxAge: null, AllowOrigin: http://localhost:11089, AllowExposedHeaders: {}, AllowHeaders: {}, AllowMethods: {}, ErrorMessages: {}'', Operation=CorsEngine.EvaluatePolicy iisexpress.exe Information: 0 : Operation=CorsMessageHandler.SendAsync, Status=500 (InternalServerError) iisexpress.exe Information: 0 : Response, Status=500 (InternalServerError), Method=PUT, Url=http://localhost:24144/api/card, Message='Content-type='application/json; charset=utf-8', content-length=unknown' iisexpress.exe Error: 0 : Operation=JsonMediaTypeFormatter.WriteToStreamAsync, Exception=Newtonsoft.Json.JsonSerializationException: Error getting value from 'Stage' on 'System.Data.Entity.DynamicProxies.Side_F7B85DBC8AA69F5AAA5ACCA92A66F2763E57D4D2046F02AC7EE6064A3409DE42'. ---> System.ObjectDisposedException: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. at System.Data.Objects.ObjectContext.EnsureConnection() at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) at System.Data.Objects.ObjectQuery`1.Execute(MergeOption mergeOption) at System.Data.Objects.DataClasses.EntityReference`1.Load(MergeOption mergeOption) at System.Data.Objects.DataClasses.RelatedEnd.Load() at System.Data.Objects.DataClasses.RelatedEnd.DeferredLoad() at System.Data.Objects.Internal.LazyLoadBehavior.LoadProperty[TItem](TItem propertyValue, String relationshipName, String targetRoleName, Boolean mustBeNull, Object wrapperObject) at System.Data.Objects.Internal.LazyLoadBehavior.<>c__DisplayClass7`2.<GetInterceptorDelegate>b__2(TProxy proxy, TItem item) at System.Data.Entity.DynamicProxies.Side_F7B85DBC8AA69F5AAA5ACCA92A66F2763E57D4D2046F02AC7EE6064A3409DE42.get_Stage() at GetStage(Object ) at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target) --- End of inner exception stack trace --- at Newtonsoft.Json.Serialization.DynamicValueProvider.GetValue(Object target) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IWrappedCollection values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IWrappedCollection values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeISerializable(JsonWriter writer, ISerializable value, JsonISerializableContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeISerializable(JsonWriter writer, ISerializable value, JsonISerializableContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value) at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value) at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value) at System.Net.Http.Formatting.JsonMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content) at System.Net.Http.Formatting.JsonMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext) --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at System.Web.Http.Tracing.ITraceWriterExtensions.<TraceBeginEndAsyncCore>d__33.MoveNext() iisexpress.exe Information: 0 : Message='Will use same 'JsonMediaTypeFormatter' formatter', Operation=JsonMediaTypeFormatter.GetPerRequestFormatterInstance iisexpress.exe Information: 0 : Message='Selected formatter='JsonMediaTypeFormatter', content-type='application/json; charset=utf-8'', Operation=DefaultContentNegotiator.Negotiate iisexpress.exe Information: 0 : Operation=JsonMediaTypeFormatter.WriteToStreamAsync iisexpress.exe Information: 0 : Operation=CardController.Dispose
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2 answers

In case someone else comes across this and happens to use Unit Of Work and CORS from WebAPI2 with EF (ha) -

I had a lazily loaded property that was not available when the Update method was running. I don’t know why the error was chosen incorrectly, but the stack trace pointed me in the right direction:

Error getting value from 'Stage' on 'System.Data.Entity.DynamicProxies.Side_F7B85DBC8AA69F5AAA5ACCA92A66F2763E57D4D2046F02AC7EE6064A3409DE42. ---> System.ObjectDisposedException: The ObjectContext instance has been deleted and can no longer be used for operations that require a connection.

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If you are using IIS 7.5 or lower, use this configuration.

 <system.webServer> <handlers> <remove name="OPTIONSVerbHandler"/> </handlers> </system.webServer>

Or if you are using IIS 8 or higher

 <system.webServer> <handlers> <remove name="OPTIONS"/> </handlers> </system.webServer>

Hope for this help

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Source: https://habr.com/ru/post/1490383/

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