Web API Object From Body is Null in IE - asp.net

Question

I have an asp.net web forms app where I'm trying to call ValidateRegistration1 method fro web api controller. It's doing fine in Firefox and Chrome but the object is null when I use IE. Content type and others seem almost the same. I couldn't find the problem.
Firefox POST in fiddler:
{Method: POST, RequestUri: 'http://localhost:5555/api/accounts/registervalidate1', Version: 1.1, Content: System.Web.Http.WebHost.HttpControllerHandler+LazyStreamContent, Headers:
{
Cache-Control: no-cache
Connection: keep-alive
Pragma: no-cache
Accept: */*
Accept-Encoding: gzip
Accept-Encoding: deflate
Accept-Language: en-US
Accept-Language: en; q=0.5
Cookie: __AntiXsrfToken=0871e412cceb47faa968c5563d19f8e1; ASP.NET_SessionId=glwlyn2mdihne0ev4uhc5fnv
Host: localhost:5555
Referer: http://localhost:5555/
User-Agent: Mozilla/5.0
User-Agent: (Windows NT 6.3; WOW64; rv:25.0)
User-Agent: Gecko/20100101
User-Agent: Firefox/25.0
X-Requested-With: XMLHttpRequest
Content-Length: 207
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
}}
IE POST in fiddler:
{Method: POST, RequestUri: 'http://localhost:5555/api/accounts/registervalidate1', Version: 1.1, Content: System.Web.Http.WebHost.HttpControllerHandler+LazyStreamContent, Headers:
{
Connection: Keep-Alive
Pragma: no-cache
Accept: */*
Accept-Encoding: gzip
Accept-Encoding: deflate
Accept-Language: en-US
Accept-Language: en; q=0.7
Accept-Language: tr; q=0.3
Cookie: __AntiXsrfToken=4772bed0c8e243f4a7893794ed176f47
Host: localhost:5555
Referer: http://localhost:5555/
User-Agent: Mozilla/5.0
User-Agent: (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0)
User-Agent: like
User-Agent: Gecko
X-Requested-With: XMLHttpRequest
Content-Length: 0
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
}}
web api method
[Route("registervalidate1")]
//[ResponseType(typeof(Account))]
[HttpPost]
public HttpResponseMessage ValidateRegistrationStep1(HttpRequestMessage request,
[FromBody]AccountRegisterModel a)
{
HttpResponseMessage response = null;
List<string> errors = new List<string>();
bool isEmailFree = _accountService.EmailInUse(a.LoginEmail);
if (isEmailFree)
errors.Add("jj.");
if (errors.Count == 0)
response = request.CreateResponse(HttpStatusCode.OK);
else
response = request.CreateResponse<string[]>(HttpStatusCode.BadRequest, errors.ToArray());
return response;
}

Answer 1

I just ran into the same issue. The fix for me was to manually add the content type of "application/json" (contentType: 'application/json') to my jQuery ajax call. I'm sure you've found a solution to this by now but I'm posting this for others out there with the same problem.