Monthly Quick Tips - December

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Howdy folks! Back with another installment of monthly quick tips on trending search terms in the community. Here are a handful from the past month:

the provided redirect_uri is not in the list of allowed callback urls.

This error typically occurs when you’re integrating Auth0 with OAuth/OIDC and the URL to which you’re trying to redirect after authentication is not listed in the “Allowed Callback URLs” field in your Auth0 settings.

• Exact Match: The redirect_uri specified in your request must exactly match one of the URLs listed in the Allowed Callback URLs field in your Auth0 Application settings.

• The Protocol Matters: Make sure that the protocols (http or https) are the same in both the “Allowed Callback URLs” and your request.

• Trailing Slashes: Be aware of trailing slashes. https://example.com/callback and https://example.com/callback/ are different URLs.

too many redirects Safari

• Review redirect URLs: Ensure that the redirect URLs specified in Auth0 and your application are correct and do not create a loop.

• Verify your Auth0 application settings, especially the allowed callback URLs, logout URLs, and allowed origins.

• Review the following FAQ:

Safari cannot open the page because too many redirects occurred

Problem statement We have some scenarios where the browser shows “too many redirects” during a web login for the mobile app. This is all handled by the Auth0 SDK and authenticating directly with Auth0 IDP. This is the error received. Safari cannot open the page because too many redirects occurred. What causes this error? Cause This is a Safari-specific error. Refer to If Safari can't open the page because too many redirects occurred - Apple Support (NG). This might occur when opening a page…

has been blocked by cors policy: response to preflight request doesn't pass access control check: it does not have http ok status.

• ​​Double-check that the “Allowed Web Origins” and “Allowed Origins (CORS)” fields in your Auth0 settings include the domain from which the request originates.

• If you are running your application locally, ensure that the local host and port are also added to the Auth0 CORS settings.

proof key for code exchange is required for cross-origin authorization code redemption.

• This error suggests that your application is expected to implement the PKCE (Proof Key for Code Exchange) flow for added security. This is particularly important for OAuth/OIDC applications that run on a user’s device and don’t have a backend to keep secrets safe.

• PKCE adds an additional layer of security by generating a unique, temporary code (the “code verifier”) on the client side at the beginning of the authentication process. This code is then transformed into a “code challenge,” which is sent alongside the authorization request. When exchanging the authorization code for an access token, the original “code verifier” must also be sent to prove that the client making the request is the same one that initiated the authorization code request.

Authorization Code Flow with Proof Key for Code Exchange (PKCE)

failed to fetch. possible reasons: cors network failure url scheme must be "http" or "https" for cors request.

• Check your browser’s console logs and network tab for more details on the failed request.

• Make sure CORS is configured correctly on the Auth0 dashboard and in your server settings.

• Verify the URL scheme to make sure it’s either HTTP or HTTPS.