Python serverless function returns 404 in local, but fine in prod

I am following your doc to create a Python serverless function. It runs fine in production, but returns 404 in local (running vercel dev). Why is that?

My project structure:

app
api
|- hello.py
requirements.txt
vercel.json

// requirements.txt

venmo-api==0.3.1

// vercel.json

{
  "buildCommand": "npx convex deploy --cmd 'npm run build'",
  "installCommand": "npm install --legacy-peer-deps",
  "functions": {
    "api/**": {
      "excludeFiles": "{.next,*.cache,node_modules,public,app}/**"
    }
  }
}

// hello.py

from http.server import BaseHTTPRequestHandler
from venmo_api import Client

class handler(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/plain')
        self.end_headers()
        self.wfile.write('Hello, world!'.encode('utf-8'))
        return

There's another community post with 404 debugging tips that might be helpful. Please give these solutions a try and let us know how it goes.

https://community.vercel.com/t/debugging-404-errors/437

Vercel Community

Debugging 404 Errors

Sometimes things don’t go as expected when deploying a website. If you see a 404 on your site, that means the page or resource couldn’t be found. There are...

A human should be around soon to offer more advice. But you can also get helpful information quickly by asking v0.

Vercel Staff

What is the Development Command for the project?

vercel dev. I mentioned it in the question.

Vercel Staff

Sorry, I wasn't clear about what I meant. Projects can have a custom Development Command defined. Does your project have a development command specified?

No, here's my package.json:

{
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "next lint"
  },
  ...
}

My vercel.json is in the original question.

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I am following your doc to create a Python serverless function. It runs fine in production, but returns 404 in local (running vercel dev). Why is that?

My project structure:

app
api
|- hello.py
requirements.txt
vercel.json

// requirements.txt

venmo-api==0.3.1

// vercel.json

{
  "buildCommand": "npx convex deploy --cmd 'npm run build'",
  "installCommand": "npm install --legacy-peer-deps",
  "functions": {
    "api/**": {
      "excludeFiles": "{.next,*.cache,node_modules,public,app}/**"
    }
  }
}

// hello.py

from http.server import BaseHTTPRequestHandler
from venmo_api import Client

class handler(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/plain')
        self.end_headers()
        self.wfile.write('Hello, world!'.encode('utf-8'))
        return