CORS credentials mode is include

Question

Yes  I know what you are thinking - yet another CORS question  but this time I m stumped   So to start off  the actual error message      XMLHttpRequest cannot load http   localhost Foo API token  The   value of the  Access-Control-Allow-Origin  header in the response must   not be the wildcard     when the request s credentials mode is    include   Origin  http   localhost 5000  is therefore not allowed   access  The credentials mode of requests initiated by the   XMLHttpRequest is controlled by the withCredentials attribute    I m not sure what is meant by credentials mode is  include    So when I perform the request in postman  I experience no such error     But when I access the same request through my angularjs web app  I am stumped by this error  Here is my angualrjs request response  As you ll see the response is OK 200  but I still receive the CORS error   Fiddler Request and Response   The following image demonstrates the request and response from web front-end to API    So based on all the other posts I ve read online  it seems like I m doing the right thing  that s why I cannot understand the error  Lastly  here is the code I use within angualrjs  login factory      CORS Implementation in API - Reference purposes   Method 1 used   public static class WebApiConfig       public static void Register HttpConfiguration config                EnableCrossSiteRequests config              private static void EnableCrossSiteRequests HttpConfiguration config                var cors   new EnableCorsAttribute                                      SupportsCredentials   true                    config EnableCors cors             Method 2 used   public void Configuration IAppBuilder app        HttpConfiguration config   new HttpConfiguration         ConfigureOAuth app        WebApiConfig Register config       app UseCors Microsoft Owin Cors CorsOptions AllowAll       app UseWebApi config        Many thanks in advance

User · Answer

If you are using CORS middleware and you want to send withCredentials boolean true, you can configure CORS like this:

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var cors = require('cors');    _x000D_
app.use(cors({credentials: true, origin: 'http://localhost:5000'}));

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`

User · Answer

Customizing CORS for Angular 5 and Spring Security  Cookie base solution   On the Angular side required adding option flag withCredentials  true for Cookie transport   constructor public http  HttpClient       public get url  string        Observable lt any gt        return this http get url    withCredentials  true         On Java server-side required adding CorsConfigurationSource for configuration CORS policy    Configuration  EnableWebSecurity public class WebSecurityConfig extends WebSecurityConfigurerAdapter         Bean     CorsConfigurationSource corsConfigurationSource             CorsConfiguration configuration   new CorsConfiguration               This Origin header you can see that in Network tab         configuration setAllowedOrigins Arrays asList  http  url 1    http  url 2              configuration setAllowedMethods Arrays asList  GET   POST             configuration setAllowedHeaders Arrays asList  content-type             configuration setAllowCredentials true           UrlBasedCorsConfigurationSource source   new UrlBasedCorsConfigurationSource            source registerCorsConfiguration        configuration           return source              Override     protected void configure HttpSecurity http  throws Exception           http cors   and                Method configure HttpSecurity http  by default will use corsConfigurationSource for http cors

User · Answer

If you re using  NET Core  you will have to  AllowCredentials   when configuring CORS in Startup CS   Inside of ConfigureServices   services AddCors o   gt        o AddPolicy  AllowSetOrigins   options   gt                options WithOrigins  https   localhost xxxx            options AllowAnyHeader            options AllowAnyMethod            options AllowCredentials                 services AddMvc      Then inside of Configure   app UseCors  AllowSetOrigins    app UseMvc routes   gt                   Routing code here           For me  it was specifically just missing options AllowCredentials   that caused the error you mentioned   As a side note in general for others having CORS issues as well  the order matters and AddCors   must be registered before AddMVC   inside of your Startup class

User · Answer

Just add Axios defaults withCredentials true instead of   credentials  true   in client side  and change app use cors    to app use cors     origin    your client side server      methods    GET    POST      credentials true

User · Answer

The issue stems from your Angular code   When withCredentials is set to true  it is trying to send credentials or cookies along with the request  As that means another origin is potentially trying to do authenticated requests  the wildcard       is not permitted as the  Access-Control-Allow-Origin  header   You would have to explicitly respond with the origin that made the request in the  Access-Control-Allow-Origin  header to make this work   I would recommend to explicitly whitelist the origins that you want to allow to make authenticated requests  because simply responding with the origin from the request means that any given website can make authenticated calls to your backend if the user happens to have a valid session   I explain this stuff in this article I wrote a while back   So you can either set withCredentials to false or implement an origin whitelist and respond to CORS requests with a valid origin whenever credentials are involved

User · Answer

If it helps  I was using centrifuge with my reactjs app  and  after checking some comments below  I looked at the centrifuge js library file  which in my version  had the following code snippet   if   withCredentials  in xhr     xhr withCredentials   true      After I removed these three lines  the app worked fine  as expected   Hope it helps

[javascript] CORS: credentials mode is 'include'

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