I've set up a REST API client (using Ruby) and Magento 1.9.1 back in 2015 and it worked flawlessly.
But a few weeks ago I noticed that every once in a while a got an exception:
Integrity constraint violation: 1062 Duplicate entry ... for key 'UNQ_OAUTH_NONCE_NONCE', the query was INSERT INTO oauth_nonce (nonce, timestamp) VALUES (?, ?)
and the request returns a 401 status.
After lots of trial and error I noticed that every time I send a POST request to the API (i.e create product, assign website, upload picture, ...) I receive that error. GET and PUT requests work without this error.
But surprisingly the requested operation is always performed successfully!
In other words, this happens:
- I send the POST request.
- Magento validates the Oauth parameters and stores the nonce.
- Magento performes the requested operation.
- Magento once again tries to check the Oauth parameters. This fails, because the nonce is already stored in the
- A get a 401 error, even if the original operation was successful.
My question: What triggers this behaviour and how can I stop it?
I already tried to remove the unique index in
oauch_nonce. This effectively prevents the SQL error, but I get a "signature_invalid" error instead. Again, the requested operation is performed nevertheless.
The exception log just duplicates the error message already returned by the request.
UPDATE: I duplicated the Magento shop on a different machine, by simply copying the files and restoring a database dump. (i.e. no clean setup)
The error does not occur on the different machine. I'm suspecting that this problem might have an external cause. Perhaps an unfortunate combination of PHP/Apache/Magento/configuration files.