Alternative directory structure does not seem to work

[leoc-22]

I was trying out the alternative directory structure locally in https://www.serverless.com/plugins/serverless-wsgi, but it does not seem to work.

my file structure:

project
├── src
│   ├── server.py
│   └── requirements.txt
├── serverless.yml

and my serverless framework yaml:

service: my-sls-app
 
plugins:
  - serverless-localstack
  - serverless-wsgi
  - serverless-python-requirements
 
custom:
  wsgi:
    app: src/server.app
    packRequirements: false
  pythonRequirements:
    dockerizePip: non-linux
    module: src
  region: ap-southeast-2
  accountID: '000000000000'
  localstack:
    stages: [local]
    host: http://localhost  # optional - LocalStack host to connect to
    edgePort: 4566  # optional - LocalStack edge port to connect to
    debug: true

package: 
  individually: true
  patterns:
    - '!.git/**'
    - '!volume/**'
    - '!scripts/**'
    - '!node_modules/**'


provider:
  name: aws
  region: ap-southeast-2
  runtime: python3.11
  memorySize: 128
  stage: ${opt:stage,'local'}
 
functions:
  app:
    handler: wsgi_handler.handler
    events:
      - http: ANY /
      - http: 'ANY /{proxy+}'

I started a localstack container by running localstack start and in another window ran serverless deploy --stage local. The lambda managed to be deployed in localstack but hitting the api route GET / returned a 502 error.

and here is the spawned container for the lambda invocation

2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="No code archives set. Skipping download." func=main.DownloadCodeArchives file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/codearchive.go:21"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="DNS server disabled." func=main.RunDNSRewriter file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/awsutil.go:143"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Process running as root user." func=main.main file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/main.go:146" euid=0 gid=0 uid=0 username=root
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Process running as non-root user." func=main.main file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/main.go:148" euid=993 gid=990 uid=993 username=sbx_user1051
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] Initializing AWS X-Ray daemon unknown
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Listening on UDP 127.0.0.1:2000
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] Using buffer memory limit of 79 MB
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] 1264 segment buffers allocated
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Using Endpoint read from Config file: http://172.21.0.2:4566
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Using proxy address: 
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Fetch region ap-southeast-2 from commandline/config file
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] Using region: ap-southeast-2
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] HTTP Proxy server using X-Ray Endpoint : http://172.21.0.2:4566
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Using Endpoint: http://172.21.0.2:4566
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Debug] Batch size: 10
2023-09-21 16:10:41 2023-09-21T06:10:41Z [Info] Starting proxy http server on 127.0.0.1:2000
Traceback (most recent call last):e.ImportModuleError: Unable to import module 'wsgi_handler': No module named 'werkzeug'
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Runtime API Server listening on 127.0.0.1:9001" func="go.amzn.com/lambda/rapi.(*Server).Listen" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/server.go:94"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=info msg="Configure environment for Init Caching." func="go.amzn.com/lambda/rapid.(*rapidContext).acceptStartRequestForInitCaching" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:391"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=info msg="extensionsDisabledByLayer(/opt/disable-extensions-jwigqn8j) -> stat /opt/disable-extensions-jwigqn8j: no such file or directory" func=go.amzn.com/lambda/rapid.extensionsDisabledByLayer file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:363"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Received RUNNING" func="go.amzn.com/lambda/rapidcore.(*Server).Init" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapidcore/server.go:533"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=warning msg="Cannot list external agents" func=go.amzn.com/lambda/agents.ListExternalAgentPaths file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/agents/agent.go:71" error="open /opt/extensions: no such file or directory"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Preregister runtime" func=go.amzn.com/lambda/rapid.doInit file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:189"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Start runtime" func=go.amzn.com/lambda/rapid.doInit file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:222"
2023-09-21 16:10:41 time="2023-09-21T06:10:41Z" level=debug msg="Hot reloading disabled." func=main.RunHotReloadingListener file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/awsutil.go:160"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - GET /2018-06-01/runtime/invocation/next, Headers:map[Accept:[*/*] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - GET /2018-06-01/runtime/invocation/next, Headers:map[Accept:[*/*] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Dispatching DONE:initCorrelationID" func="go.amzn.com/lambda/rapidcore.(*Server).dispatchDone" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapidcore/server.go:472"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=info msg="blocking the credentials service" func="go.amzn.com/lambda/core.(*credentialsServiceImpl).BlockService" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/core/credentials.go:84"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Initialize invoke flow barriers" func=go.amzn.com/lambda/rapid.doInvoke.func1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:289"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Set renderer for invoke" func=go.amzn.com/lambda/rapid.doInvoke.func1.2 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:310"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Release agents conditions" func=go.amzn.com/lambda/rapid.doInvoke.func1.2 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:318"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Release runtime condition" func=go.amzn.com/lambda/rapid.doInvoke.func1.2 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:327"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Await runtime response" func=go.amzn.com/lambda/rapid.doInvoke.func1.2 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:329"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - POST /2018-06-01/runtime/invocation/acb8bbce-cd42-4fa2-90b4-2d758cc683a5/error, Headers:map[Accept:[*/*] Content-Length:[199] Content-Type:[application/json] Lambda-Runtime-Function-Xray-Error-Cause:[{\"working_directory\": \"/var/task\", \"exceptions\": [{\"message\": \"Unable to import module 'wsgi_handler': No module named 'werkzeug'\", \"type\": \"LambdaValidationError\", \"stack\": []}], \"paths\": []}] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - POST /2018-06-01/runtime/invocation/acb8bbce-cd42-4fa2-90b4-2d758cc683a5/error, Headers:map[Accept:[*/*] Content-Length:[199] Content-Type:[application/json] Lambda-Runtime-Function-Xray-Error-Cause:[{\"working_directory\": \"/var/task\", \"exceptions\": [{\"message\": \"Unable to import module 'wsgi_handler': No module named 'werkzeug'\", \"type\": \"LambdaValidationError\", \"stack\": []}], \"paths\": []}] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Await runtime ready" func=go.amzn.com/lambda/rapid.doInvoke.func1.3 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapid/start.go:337"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - GET /2018-06-01/runtime/invocation/next, Headers:map[Accept:[*/*] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="API request - GET /2018-06-01/runtime/invocation/next, Headers:map[Accept:[*/*] User-Agent:[aws-lambda-python/3.11.5-2.0.7]]" func=go.amzn.com/lambda/rapi/middleware.AccessLogMiddleware.func1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapi/middleware/middleware.go:76"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="Dispatching DONE:invokeCorrelationID" func="go.amzn.com/lambda/rapidcore.(*Server).dispatchDone" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapidcore/server.go:472"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=debug msg="execute finished, autoreset cancelled" func="go.amzn.com/lambda/rapidcore.(*Server).Invoke.func1" file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/lambda/rapidcore/server.go:588"
2023-09-21 16:10:42 time="2023-09-21T06:10:42Z" level=info msg="Sending to /error" func=main.NewCustomInteropServer.func1.1.1 file="/home/runner/work/lambda-runtime-init/lambda-runtime-init/cmd/localstack/custom_interop.go:170"

without running serverless deploy --stage local but using serverless wsgi serve works fine but I would like to test the app as close to cloud environment as possible.

my requirements.txt is:

blinker==1.6.2
click==8.1.7
Flask==2.3.3
itsdangerous==2.1.2
Jinja2==3.1.2
MarkupSafe==2.1.3
Werkzeug==2.3.7

using python 3.11