Difference between the routeKey in event object GET /projects/<id> on local vs GET /projects/{id} on AWS

[samaybhavsar]

Description:

I created a project using SAM CLI v1.33.0 with Runtime: nodejs14.x. When running on my local machine using sam local start-api the routeKey in event object has angle brackets e.g. GET /projects/ while after deploying on AWS the routeKey in event object has curly brackets e.g. GET /projects/{id} . I am using the routeKey for access control.

Another similar issue which I noticed is, when running local I get "queryStringParameters": {}, (key with blank object) while after deploying to AWS, the key is not present.

Steps to reproduce:

• Create a sample project using sam init
• Set up an API endpoint with custom field in URL. e.g. project/{project_id}
• Deploy the same to AWS
• Compare event object for both

Observed result:

• routeKey has angle brackets instead of curly brackets
• "queryStringParameters": {}, on local but when deployed on AWS, this key is missing

Expected result:

Should have curly brackets in routeKey

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: Windows 10
2. sam --version: 1.33.0
3. AWS region: ca-central-1

Add --debug flag to command you are running

[torresxb1]

Thanks for reporting the issue! I was able to reproduce in SAM CLI v1.35 for HttpApi with the following template:

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs14.x
      Architectures:
        - x86_64
      Events:
        HelloWorld:
          Type: HttpApi 
          Properties:
            ApiId: !Ref MyApi
            Path: /project/{project_id}
            Method: get

  MyApi:
    Type: AWS::Serverless::HttpApi
    Properties:
      StageName: Prod

In the handler, I just include the incoming event in the response and I do see "routeKey":"GET /project/<project_id>" and "queryStringParameters":{} when I run sam local start-api and curl the endpoint. When I curl the deployed endpoint, I see "routeKey":"GET /project/{project_id}" and queryStringParameters is not present.

We've identified the issue, added it to our backlog, and will prioritize it accordingly. Thanks again for bringing this to our attention!

[mndeveci]

Released with SAM CLI v1.38.0