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POError :Request header field Content-Type is not allowed by Access-Control-Allow-Headers
 

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  1. POError :Request header field Content-Type is not allowed by Access-Control-Allow-Headers
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    <p>I created an mvc4 web api project using vS2012. I used following tutorial to solve the Cross-Origin Resource Sharing, "http://blogs.msdn.com/b/carlosfigueira/archive/2012/07/02/cors-support-in-asp-net-web-api-rc-version.aspx". It is working successfully, and i post data from client side to server successfully.</p> <p>After that for implementing Autherization in my project, I used the following tutorial to implement OAuth2, "http://community.codesmithtools.com/CodeSmith_Community/b/tdupont/archive/2011/03/18/oauth-2-0-for-mvc-two-legged-implementation.aspx". This is help me for getting RequestToken on client side.</p> <p>But when i post data from client side, i got the error, <strong>"XMLHttpRequest cannot load http://. Request header field Content-Type is not allowed by Access-Control-Allow-Headers."</strong></p> <p>My <strong>client side</strong> code look like,</p> <pre><code> function PostLogin() { var Emp = {}; Emp.UserName = $("#txtUserName").val(); var pass = $("#txtPassword").val(); var hash = $.sha1(RequestToken + pass); $('#txtPassword').val(hash); Emp.Password= hash; Emp.RequestToken=RequestToken; var createurl = "http://localhost:54/api/Login"; $.ajax({ type: "POST", url: createurl, contentType: "application/json; charset=utf-8", data: JSON.stringify(Emp), statusCode: { 200: function () { $("#txtmsg").val("done"); toastr.success('Success.', ''); } }, error: function (res) { toastr.error('Error.', 'sorry either your username of password was incorrect.'); } }); }; </code></pre> <p>My <strong>api controller</strong> look like,</p> <pre><code> [AllowAnonymous] [HttpPost] public LoginModelOAuth PostLogin([FromBody]LoginModelOAuth model) { var accessResponse = OAuthServiceBase.Instance.AccessToken(model.RequestToken, "User", model.Username, model.Password, model.RememberMe); if (!accessResponse.Success) { OAuthServiceBase.Instance.UnauthorizeToken(model.RequestToken); var requestResponse = OAuthServiceBase.Instance.RequestToken(); model.ErrorMessage = "Invalid Credentials"; return model; } else { // to do return accessResponse return model; } } </code></pre> <p>My <strong>webconfig</strong> file look like,</p> <pre><code> &lt;configuration&gt; &lt;configSections&gt; &lt;section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt; &lt;section name="oauth" type="MillionNodes.Configuration.OAuthSection, MillionNodes, Version=1.0.0.0, Culture=neutral"/&gt; &lt;sectionGroup name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection, DotNetOpenAuth.Core"&gt; &lt;section name="messaging" type="DotNetOpenAuth.Configuration.MessagingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" /&gt; &lt;section name="reporting" type="DotNetOpenAuth.Configuration.ReportingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" /&gt; &lt;/sectionGroup&gt; &lt;/configSections&gt; &lt;oauth defaultProvider="DemoProvider" defaultService="DemoService"&gt; &lt;providers&gt; &lt;add name="DemoProvider" type="MillionNodes.OAuth.DemoProvider, MillionNodes" /&gt; &lt;/providers&gt; &lt;services&gt; &lt;add name="DemoService" type="MillionNodes.OAuth.DemoService, MillionNodes" /&gt; &lt;/services&gt; &lt;/oauth&gt; &lt;system.web&gt; &lt;httpModules&gt; &lt;add name="OAuthAuthentication" type="MillionNodes.Module.OAuthAuthenticationModule, MillionNodes, Version=1.0.0.0, Culture=neutral"/&gt; &lt;/httpModules&gt; &lt;compilation debug="true" targetFramework="4.0" /&gt; &lt;authentication mode="Forms"&gt; &lt;forms loginUrl="~/Account/Login" timeout="2880" /&gt; &lt;/authentication&gt; &lt;pages&gt; &lt;namespaces&gt; &lt;add namespace="System.Web.Helpers" /&gt; &lt;add namespace="System.Web.Mvc" /&gt; &lt;add namespace="System.Web.Mvc.Ajax" /&gt; &lt;add namespace="System.Web.Mvc.Html" /&gt; &lt;add namespace="System.Web.Optimization" /&gt; &lt;add namespace="System.Web.Routing" /&gt; &lt;add namespace="System.Web.WebPages" /&gt; &lt;/namespaces&gt; &lt;/pages&gt; &lt;/system.web&gt; &lt;system.webServer&gt; &lt;validation validateIntegratedModeConfiguration="false" /&gt; &lt;modules&gt; &lt;add name="OAuthAuthentication" type="MillionNodes.Module.OAuthAuthenticationModule, MillionNodes, Version=1.0.0.0, Culture=neutral" preCondition="" /&gt; &lt;/modules&gt; &lt;httpProtocol&gt; &lt;customHeaders&gt; &lt;add name="Access-Control-Allow-Origin" value="*" /&gt; &lt;/customHeaders&gt; &lt;/httpProtocol&gt; &lt;/system.webServer&gt; &lt;dotNetOpenAuth&gt; &lt;messaging&gt; &lt;untrustedWebRequest&gt; &lt;whitelistHosts&gt; &lt;!-- Uncomment to enable communication with localhost (should generally not activate in production!) --&gt; &lt;!--&lt;add name="localhost" /&gt;--&gt; &lt;/whitelistHosts&gt; &lt;/untrustedWebRequest&gt; &lt;/messaging&gt; &lt;!-- Allow DotNetOpenAuth to publish usage statistics to library authors to improve the library. --&gt; &lt;reporting enabled="true" /&gt; </code></pre> <p> </p>
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    1. COTake a look at this http://stackoverflow.com/questions/5027705/error-in-chrome-content-type-is-not-allowed-by-access-control-allow-headers and add another rule in your web config
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    2. COHi are you testing this js directly from your browser and local file system e.g. file:// URL.?? And from which browser?
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