Comments (12)
Hi,
I had a feeling that was the case. We only used app.use(cors());, but then out of nowhere, a client of ours is having preflight failure and can't use our platform. We added the app.options('*', cors()) as a precaution to the preflight issues but they are still having preflight issues in both Chrome and Edge. We are trying to make sure everything on the server side is solid. We have never seen this before and then there is a preflight failure....out of nowhere. There is nothing more we can do on our side, other than suggest a plugin for the client., which is not the best option.
What other options should we pursue if the client is still failing? This is the Chrome error (real web address changed) : 'https://sampleapi.com/me' from origin 'https://sampleeapp.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin'
Any help on this would be appreciated!
thanks.
Steve
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@sinclas We are having this exact issue. Did you manage to get around it?
from cors.
Hello, and sorry you are having trouble. To answer your question, if you are using app.use
for your cors middleware then you do not need to also use app.options
, though it won't hurt anything. The reason is that app.use
will run for all http methods -- only if you have the cors middleware on a non-options route like app.post
that needs to support preflight requests would also need the app.options
configuration.
from cors.
Same issue with me, are you using an API gateway?
from cors.
If yes, you can check if there's any solution provided by the infrastructure documentation for CORS.
from cors.
No, I have a NodeJS instance running solo. I do use the AWS gateway API and no CORS issues there. Will send the account that is having issues a link to one of those CORS test websites. I have done everything on the server side at this point!
from cors.
@sinclas It would be interesting to see the problematic preflight request and its response.
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@sinclas I am having similar issues. Any updates? I actually can see that my server is not providing the "allow-control-access-origin" header. This only happened when I enabled credentials. I also have this issue with edge, firefox, and chrome"
from cors.
Same here
from cors.
any update on this ? thanks!
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access to fetch at 'https://localhost:3000' from origin 'localhost:5000' 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. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
from cors.
Hi guys, i managed to get a solution to this issue by adding a lib called cors. This is my express controller of auth methods.
The provided code demonstrates how the origin key in the corsOptions object is utilized to specify the correct origin, which is set to localhost:3000 in this instance. However, it's important to note that in your specific scenario, this origin value is likely to differ. You should tailor it to match the website for which you are encountering CORS preflight issues.
import express, { Response } from 'express';
import AuthController from '../../controllers/auth';
import cors from 'cors';
const corsOptions = {
origin: "http://localhost:3000",
optionsSuccessStatus: 200, // some legacy browsers (IE11, various SmartTVs) choke on 204
};
export const AuthRouter = () => {
const router = express.Router();
// Auth
router.use('/', express.json());
router.use('/', express.urlencoded({ extended: true }));
router.use('/signin', cors(corsOptions));
router.post('/signin', AuthController.signIn);
return router;
};
What you guys need to test before going to browser, is if the OPTIONS method return all the things you guys need. In my case, was just the allow origin that was missing. As we can see here in the Insomnia
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Related Issues (20)
- [Feature request] A more powerful custom origin calculation method depending on other headers HOT 6
- No Configuration Options for Access-Control-Allow-Private-Network HOT 1
- CORS Error only on Mac HOT 2
- Cors origin RegExp issues HOT 10
- Option preflightContinue not working with origin function
- Array - set origin -Not working HOT 3
- Incorrect response when option origin is true and requestOrigin is undefined HOT 2
- "origin" is undefined when requests are received from the same server AND when malicious requests are sent from a program HOT 1
- Undefined origin should be treated as not allowed - discusson HOT 4
- Configure Allowed Headers as Array of RegExp
- DEMO is broken HOT 1
- Invalid Vary header in Access-Control-Allow-Headers HOT 2
- `OPTIONS` request handler missing `Allow` header HOT 13
- cors is hanging HOT 2
- CORS error when fonts
- Add support for having specified domain instead of wildcard HOT 3
- Request: callback for failed CORS HOT 5
- Cors error when connecting through ssh tunnel HOT 1
- I have random 'Access-Control-Allow-Origin' errors, even if i set origin: '*', is my usage correct ? HOT 3
- Add ability to omit `Vary: Origin` header HOT 3
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