Getting UnknownOperationException while using AWS service catalog API

Question

We are trying to build custom application to integrate with AWS service catalog. When  trying to hit that endpoint with Postman, but keep getting an error- com.amazon.coral.service#UnknownOperationException .? The error and postman configs are as follows:

Postman Config:
Post: https://servicecatalog.us-east-1.amazonaws.com/

Authorization:
AWS Signature
AccessKey: 
SecretKey: 
AWS Region: 
Service Name: servicecatalog

Headers:

X-Amz-Target:AWSServiceCatalog.ListPortfolios
Content-Type:application/json ( tried with application/x-amz-json-1.1)

Response: Response code- 200

{"Output":{"__type":"com.amazon.coral.service#UnknownOperationException","message":null},"Version":"1.0"}

Answer

if you are writing code with Python, maybe this will be helpful

```
import boto3

def list_portfolios():
    # Create a service catalog client
    sc = boto3.client('servicecatalog')

# Call the list_portfolios method
    response = sc.list_portfolios()

# Print the portfolio details
    for portfolio_detail in response['PortfolioDetails']:
        print(portfolio_detail)

# Call the function
list_portfolios()

```

but if you want to call via HTTP request, you need to correct Authorization value in the header, it uses AWS Signing key, not AWS Access Key or Secret Key

Getting UnknownOperationException while using AWS service catalog API

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