Hi I am calling an Azure Application Proxy endpoint (myapp.msappproxy.net) through the browser and am running into a CORs issue. How/where can I configure CORs for the Azure Application Proxy endpoint? I've looked in both the old and new Azure portals.
The error I'm getting is on the OPTIONS preflight request.
XMLHttpRequest cannot load https://myapp.msappproxy.net. Response for
preflight is invalid (redirect)
I realize that you set the access-control headers on the API endpoint, in this case the App Proxy, but I can not find where to do so. Additionally, I must set a custom header in my request, because am using bearer token authentication.
Thanks!
Just had the same issue. I have an Azure Application Proxy. So an internal page is available for externals. But normally the Application Body is set to No. With that setting browsers having huge CORS errors. To fix these CORS problems you have to set the Application Body to Yes. Now the body is correctly set and all browsers are able to show the website without CORS issues.
Also good hints you can find in the Enable link translation section.
Related
I have my Express API server as well as the SPA hosted on Heroku. The SPA uses Azure ad authentication using MSAL. The APIs are secured using Passport-azure-ad. Everything was working well in my localhost and the requests made where getting a success response. However on uploading the changes to Heroku I am now getting the CORS error. I have registered the API on Azure AD and exposed the API to my SPA. Any reason why I am still getting the error?
Access to fetch at 'https://myTestApp-server.herokuapp.com/getUsers' from origin 'https://myTestApp.herokuapp.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
To avoid the CORS error, make sure to add the header like below:
While adding the Allowed origins use * to allow all like below:
Otherwise, add particular origins like below:
Make sure to restart the Api after making the above changes.
Check whether you are using correct version of NodeJs that matches the runtime you’re developing and testing.
Try modifying CORS policy by adding .SetIsOriginAllowed((host)=> true)"
If you are adding header via Nodejs code make use of below command:
res.setHeader('Access-Control-Allow-Origin', '*');
Or
res.setHeader('Access-Control-Allow-Origin',
https://myTestApp-server.herokuapp.com:4200');
For more in detail, please refer below link:
Azure App Service No ‘Access-Control-Allow-Origin’ header is present
No 'Access-Control-Allow-Origin' header is present on the requested resource in angular app
3 Ways to Fix the CORS Error and How the Access-Control-Allow-Origin Header Works
I am trying to communicate with an app that is hidden behind an Azure Web Proxy/Active Directory setup.
I have tried the following so far:
Written an app in Ionic (Angular)
Set up Ionic's AuthConnect plugin so I am able to get hold of an access token from AD
Set the access token in an 'Authorization' header which this link appears to suggest
Send POST requests which works fine with any other API, just not the one behind the Web Proxy
Tried to set up IIS CORS module on the server-side. I have attached an image of the current config below.
When I try to send a POST request to the Web Proxy app URL, I get a 403 forbidden error on the preflight request.
I'm getting the error "Access to XMLHttpRequest at 'https://www.testurl.com/test' from origin 'http://localhost:8100' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource."
Is anyone able to point me in the right direction please? Any help would be greatly appreciated.
You might be facing CORS (Cross-Origin Resource Sharing) issues. You should try turning off CORS in whichever browser you are using. Also, as the error statement says, “No ‘Access-Control-Allow-Origin’ header is present on the requested resource”, you should check the domain or site from where you are sending a POST request to your web proxy app url and whether CORS is disabled/bypassed for your web proxy resource or not. Try sending a POST request from your domain only, not from outside or another domain with CORS enabled.
Also, might be you are sending a POST request from a ‘http’ web server which doesn’t has an SSL certificate installed, so try installing an SSL certificate on your local host and then send a POST request.
You can also check the app virtual directory permissions for web proxy resource access and correct accessibility as you have received a forbidden 403 error while accessing the web app page.
Please refer below threads for more clarification on your issue: -
Response to preflight request doesn't pass access control check
Access to XMLHttpRequest has been blocked by CORS policy
How does Access-Control-Allow-Origin header work?
Thanking you,
I am trying to get the nodeJS keycloak adapter working with my Express application, but am facing a CORS issue when it tries to redirect to the login page for routes I have protected with the keycloak middleware:
XMLHttpRequest cannot load
http://192.168.132.44:8080/auth/realms/Actora/protocol/openid-connect/auth?client_id=actora-test&state=0e9c9778-c41b-4aa8-8052-d0f0125045ac&redirect_uri=http%3A%2F%2Flocalhost%3A5001%2Fauth%2Fchecktoken%3Fauth_callback%3D1&scope=openid&response_type=code.
Response to preflight request doesn't pass access control check: No
'Access-Control-Allow-Origin' header is present on the requested
resource. Origin 'http://localhost:5001' is therefore not allowed
access.
In my keycloak client settings I have added a single value of '*' to the Web Origins config section.
I have also enabled cors on my node express application using the node cors library, following this express guide here
var cors = require('cors'),
app = express();
app.use(cors());
app.options('*', cors()); //enable for all pre-flight requests
I using version 3.2.1 of keycloak in case that makes any difference (I see a new version is out as an RC)
Has anyone faced similar issues and managed to resolve? I have been digging through many JBOSS mailing list threads and other stackoverflows, and all seem to suggest its as simple as adding the '*' entry to the web origins config section for the client on the keycloak admin site but this is not the case for me.
Thanks
I am also working on this issue with mindparse.
I think the key issue here is that the keycloak server is not responding with any ACCESS-CONTROL-ALLOW-ORIGIN headers despite the fact that he has correctly configured the "web Origins" setting in the keycloak admin portal.
A more in depth flow of the process is:
The user attempts to call a keycloak secured route on a node express server
Keycloak middleware detects that the user is not authenticated and
responds to the request with a 302 (redirect) to a custom login page hosted
by the keycloak server.
The browser sends an OPTIONS request to the keycloak server to check if it is
because it is a cross origin request.
The keycloak servers response DOES NOT include the ACCESS-CONTROL-ALLOW-
ORIGIN header to tell the browser that it has permission to make this
request.
The browser then reads this response and therefore does not make the follow
up request because it did not pass the access control allow origin checks
Just put the url of your app like "http://localhost:8081" in "Web Origins" field of client settings in Keycloak.
I had the exact same problem. I am using Keycloak 6.0.1
In my case, I had to add "enable-cors": true in keycloak.json in my Java backend server.
Afterward, I had another issue: 401 UNAUTHORIZED.
This post solved the problem
Web Origins must be set correctly for a configured client, yes, but it too has some pitfalls because a "+" setting depends on other values.
E.g., I had this wrong configuration for local tests:
Root URL: http://localhost:3000/
Valid redirect URIs: *
Web Origins: +
... and it failed with a CORS issue like you describe.
The issue lay with the other two settings, so this is correct and works now:
Root URL: http://localhost:3000
Valid redirect URIs: /*
Web Origins: +
(The KeyCloak UI is a usability nightmare on many fronts, imo, this is just one pitfall)
I also faced CORS issues while trying to connect to KeyCloak, even though I had correctly filled out the "Web Origins" url.
Turned out I accidentally connected to the wrong App (Client) and tenant (Realm), therefore not passing the CORS checks. Pointing to the right app and tenant fixed my problem.
I have a nodeJS express app, that serves front end app using React and also provides an API. The React app calls the backend API and as such there is no cross origin.
When I deploy this to Bluemix without SSO, everything works fine. When I deploy using SSO service I get error
Fetch API cannot load https://abcd-9bgrvudk1p-ct20.iam.ibmcloud.com/idaas/oidc/endpoint/default/authorize?response_type=code&client_id=Z4eSiL50dT&redirect_uri=https%3A%2F%2Fconsole-sso.mybluemix.net%2Fauth%2Fsso%2Fcallback&scope=openid%20openid.
No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://console-sso.mybluemix.net' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
I tried calling the API directly and after SSO auth, it works fine, But when the API is invoked by the front end app, it returns the above error.
FYI, API target is https://console-sso.mybluemix.net/api/reports/daily-reports
I have followed the Single Sign On documentation
I tried adding CORS module and response headers to allow a CORS request but it did not work. I also tried adding * to SSO configuration to allow all origins but no luck. Any pointers would be great! Thanks
This will require Support to review. Please open a ticket with the BlueMix support team
I am unable to get the CORS option in Azure API App to work. Is this a known Issue?
Chrome throws "No 'Access-Control-Allow-Origin' header is present on the requested resource" error.
As a workaround I have enabled CORS in the code using System.Web.Http.Cors. However I would like to take advantage of the Azure API App CORS Option.
This is a late response but I found a simple way to enable this through the portal: