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Forum Discussion
authenticating your app (code has expired error)
Hi there,
I am following the steps mentioned here https://www.dropbox.com/developers/core/start/java. but when I run the java program for second time, it says that "code has expired (within the last hour)", "error": "invalid_grant".
What should I do?
Especially, my question is how to set the access to the app so that the code is gotten only once, then you never need to do it again and the access stays there.
I want to automatically send the user to the authorization URL and pass in a callback URL so that the user is seamlessly redirected back to my app after pressing a button? rather than directing the user to the login page?
Thanks in advance
7 Replies
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- Ed
Dropbox Staff
Hi there,
Sorry for the delayed response - are you still having issues?
Trying to sync an app on put it in and it says expired.windows with dropbox. I get the code sent to my phone and immediately put in in and it says expired.
- Robert S.
Super User alumni
Moved to API Development.
- Greg-DB
Dropbox Community Moderator
Chan, You're getting this error because each "authorization code" that you exchange for the access token is short-lived (just a few minutes) and can only be used once, so you can only use each one once, soon after retrieving it.
After that, you can just store and re-use the resulting access token that your app receives from the app authorization flow for each account. These access tokens don't expire automatically (though they can be manually revoked) so your app can re-use them without manual user intervention.
And yes, you can set this up to work without the manual/copy paste. The tutorial uses the flow without a redirect URI, but instead, for web apps, you'll want to use
DbxWebAuth:https://dropbox.github.io/dropbox-sdk-java/api-docs/v1.7.x/com/dropbox/core/DbxWebAuth.html
- Greg-DB
Andrew, your post seems unrelated to this thread, so you'll likely be better served in the Bugs & Troubleshooting section:
https://www.dropboxforum.com/hc/en-us/community/topics/200203389-Bugs-Troubleshooting
Thank you for your response, the code was used within seconds of receiving it.
- Greg-DB
In your first post you mentioned the error occurred on the second run. Are you only getting the error the second time, or do you also get the error on the first attempted use of a new authorization code? If it's the first use, can you post your code and output?
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