This assumes you have already:

• Downloaded and Installed the AWS Serverless Application Model (SAM) CLI on Linux.
• Initialize Serverless Application Model (SAM) app using the sam init command
• Built your Serverless Application Model (SAM) app using the sam build command
• Deployed Serverless Application Model (SAM) app using the sam deploy command

Let's say the template.yaml file for your SAM app is located at /tmp/sam-app/template.yaml.

]$ ll /tmp/sam-app
total 20
drwxrwxr-x 2 ec2-user ec2-user   24 Nov 16 02:13 events
drwxrwxr-x 2 ec2-user ec2-user   63 Nov 16 02:13 myapp
-rw-rw-r-- 1 ec2-user ec2-user    0 Nov 16 02:13 __init__.py
-rw-rw-r-- 1 ec2-user ec2-user 8329 Nov 16 02:13 README.md
-rw-rw-r-- 1 ec2-user ec2-user  679 Nov 16 02:13 samconfig.toml
-rw-rw-r-- 1 ec2-user ec2-user 1681 Nov 16 02:13 template.yaml
drwxrwxr-x 4 ec2-user ec2-user   80 Nov 16 02:13 tests

The sam list endpoints command should return both the /Prod and /Stage URLs of your Serverless Application Model (SAM) apps.

]$ sam list endpoints --template /tmp/sam-app/template.yaml --output json
[
  {
    "LogicalResourceId": "myFunction",
    "PhysicalResourceId": "sam-app-myFunction-MgYCNMibayEZ",
    "CloudEndpoint": "-",
    "Methods": "-"
  },
  {
    "LogicalResourceId": "ServerlessRestApi",
    "PhysicalResourceId": "zulgntw90l",
    "CloudEndpoint": [
      "https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Prod",
      "https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Stage"
    ],
    "Methods": [
      "/api/v1['get']"
    ]
  }
]

curl can be used to submit a GET request to the /Prod and /Stage URLs. In this example, "hello world" is returned.

~]$ curl --request GET --url https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Stage/api/v1
{"message": "hello world"}

~]$ curl --request GET --url https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Prod/api/v1
{"message": "hello world"}

Let's say /tmp/sam-app/myapp/app.py contains the logic that returns JSON "hello world". Let's add "yo": "whats up"

import json

def lambda_handler(event, context):

    return {
        "body": json.dumps({
            "message": "hello world",
            "yo": "whats up?"
        }),
    }

The use the sam sync command to sync this change to AWS Cloud. This is like deploying an updated version of your app.

sam sync --template /tmp/sam-app/template.yaml --stack-name sam-app --no-watch

Now curl should return "dude, what's up?".

~]$ curl --request GET --url https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Stage/api/v1
{"message": "hello world", "yo": "whats up?"}

~]$ curl --request GET --url https://zulgntw90l.execute-api.us-east-1.amazonaws.com/Prod/api/v1
{"message": "hello world", "yo": "whats up?"}