Authorization header requires 'Credential' parameter. Authorization header requires 'Signature' parameter

Question

I have delivered aws serverless (LAmbda, API GW & DynamoDB), but during the developers test they have faced the following error with their 'Postman' utility:

{

    "message": "Authorization header requires 'Credential' parameter. 
               Authorization header requires 'Signature' parameter. 
               Authorization header requires 'SignedHeaders' parameter. 
               Authorization header requires existence of either a 'X-Amz-Date' or a 'Date'          
               header. 
               Authorization=xxxxxxxxxxxxxxxxxxxx"
} 

I have checked the cloudwatch logs but I didn't found anything and I assume that mean the request didn't reached the API endpoint, I don't know why.

Actually, I need to find out whether this error happening because of the Postman parameters or api endpoints.

P.S. Lambda code was developed using Python

Please advise.

Answer 1

The errors are self-explanatory. No they are not. According the API Gateway troubleshooting docs, the error message:

Authorization header requires 'Credential' parameter. Authorization header requires 'Signature' parameter. Authorization header requires 'SignedHeaders' parameter. Authorization header requires existence of either a 'X-Amz-Date' or a 'Date' header. Authorization=allow

indicates that the resource path doesn't exist. Check your url and make sure you're accessing the correct endpoint.