I've been stuck trying to link my DynamoDB to the API Gateway for about a week while working on the cloud resume challenge. I'm using AWS SAM and have created two separate functions – one for retrieving the visitor count from DynamoDB and another for updating it. Initially, both the GET and PUT paths worked perfectly with the CORS configuration, but after writing my Python code, I'm now getting a persistent 502 error. I've gone through my code several times without spotting the issue and have included the DynamoDBCrudPolicy in my template. Any insights would be greatly appreciated!
2 Answers
You should check the CloudWatch logs for any specific error messages. They can provide more context on what’s going wrong with your functions. Often, the logs will highlight the exact issue that’s causing the 502 error!
I noticed that the way you're incrementing and writing could lead to race conditions if your API gets heavy traffic. Have you considered using DynamoDB's atomic counters? They handle concurrent updates more safely. Here's a link that might help: [DynamoDB Atomic Counters](https://repost.aws/questions/QU9fLx1SUIRU6odFtgtIh6kA/dynamodb-atomic-counters).
It's fixed. Thank you so much!
OMG!!! THANK YOU SO MUCH!!!!! IT'S FIXED!!!!! <3 I kept thinking my python was wrong but it's just that the keyword 'counter' is reserved.