Encountering a Issue with POST Method in AngularJS Calling .NET WebAPI

Question

Encountering a Issue with POST Method in AngularJS Calling .NET WebAPI

I am currently facing a challenge with my AngularJS and .NET WebAPI integration. While I can retrieve content or objects successfully through the WebAPI, I am encountering difficulties when attempting to POST data.

When trying to post the content, I receive the following errors:

OPTIONS http://localhost:18130/api/Products XMLHttpRequest cannot load

http://localhost:18130/api/Products. Response for preflight has invalid HTTP status code 405

It's worth noting that when using Fiddler to post, everything works perfectly without any issues.

Below is the AngularJS code snippet I'm utilizing for posting:

var data = { "Title": $scope.title, "Description": $scope.description };

$http.post(
    'http://localhost:18130/api/Products',
     JSON.stringify(data), {
         headers: {
             'Content-Type': 'application/json; charset=UTF-8'
          }
      }).success(function (data) {
          console.log(data);
      });

Could someone kindly point me in the right direction? The WebAPI and AngularJS app reside on separate domains—is this a CORS issue? How can I resolve this problem when performing posts?

Thank you in advance.

javascript c#angularjs asp.net-web-api cors

Answer 1

Answer №1

When creating your web API project, the template used will determine whether OWIN is used or not. If OWIN is being used (if not, refer to scniro's answer for an alternative starting point):

I encountered a similar issue while posting to my web API from a JavaScript application. To resolve this, I installed Microsoft.Owin.Cors from NuGet and added the following code to my Startup.cs:

    public void Configuration(IAppBuilder app) {
        app.UseCors(new CorsOptions {
            PolicyProvider = new CorsPolicyProvider {
                PolicyResolver = context => {
                    CorsPolicy result = new CorsPolicy {
                        AllowAnyHeader = true,
                        AllowAnyMethod = true,
                        AllowAnyOrigin = true,
                        SupportsCredentials = true
                    };                        
                    return Task.FromResult(result);
                }
            }
        });
    }

This configuration allows all requests. For production, you can restrict requests to specific origins like this:

    public void Configuration(IAppBuilder app) {
        app.UseCors(new CorsOptions {
            PolicyProvider = new CorsPolicyProvider {
                PolicyResolver = context => {
                    CorsPolicy result = new CorsPolicy {
                        AllowAnyHeader = true,
                        AllowAnyMethod = true,
                        AllowAnyOrigin = false,
                        SupportsCredentials = true
                    };
                    result.Origins.Add(ConfigurationManager.AppSettings.Get("YourAllowedUrl"));
                    return Task.FromResult(result);
                }
            }
        });
    }

Hopefully, this solution helps.

Answer 2

When creating your web API project, the template used will determine whether OWIN is used or not. If OWIN is being used (if not, refer to scniro's answer for an alternative starting point):

I encountered a similar issue while posting to my web API from a JavaScript application. To resolve this, I installed Microsoft.Owin.Cors from NuGet and added the following code to my Startup.cs:

    public void Configuration(IAppBuilder app) {
        app.UseCors(new CorsOptions {
            PolicyProvider = new CorsPolicyProvider {
                PolicyResolver = context => {
                    CorsPolicy result = new CorsPolicy {
                        AllowAnyHeader = true,
                        AllowAnyMethod = true,
                        AllowAnyOrigin = true,
                        SupportsCredentials = true
                    };                        
                    return Task.FromResult(result);
                }
            }
        });
    }

This configuration allows all requests. For production, you can restrict requests to specific origins like this:

    public void Configuration(IAppBuilder app) {
        app.UseCors(new CorsOptions {
            PolicyProvider = new CorsPolicyProvider {
                PolicyResolver = context => {
                    CorsPolicy result = new CorsPolicy {
                        AllowAnyHeader = true,
                        AllowAnyMethod = true,
                        AllowAnyOrigin = false,
                        SupportsCredentials = true
                    };
                    result.Origins.Add(ConfigurationManager.AppSettings.Get("YourAllowedUrl"));
                    return Task.FromResult(result);
                }
            }
        });
    }

Hopefully, this solution helps.

Answer 3

Answer №2

@Jordan, I suggest you disable all handlers in the web.config file and then readd them:

<modules>
  <remove name="FormsAuthenticationModule" />
  <remove name="WebDAVModule" />
</modules>
<handlers>
  <remove name="WebDAV" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>

Answer 4

@Jordan, I suggest you disable all handlers in the web.config file and then readd them:

<modules>
  <remove name="FormsAuthenticationModule" />
  <remove name="WebDAVModule" />
</modules>
<handlers>
  <remove name="WebDAV" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>

Encountering a Issue with POST Method in AngularJS Calling .NET WebAPI

Answer №1

Answer №2

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