Deploy Traditional Web Frameworks to Alibaba Cloud Function Compute (Serverless)

Background

Serverless is a programming paradigm; deploying traditional web frameworks (e.g., Django, Flask, Express, Next.js) to serverless platforms is difficult because they lack native support.

Request Integration Scheme

The scheme forwards the original API‑gateway request directly to Alibaba Cloud Function Compute HTTP functions without additional transformation, allowing rapid deployment of existing frameworks with minimal changes.

Bottle Example

# index.py
import bottle

@bottle.route('/hello/<name>')
def index(name):
    return "Hello world"

if __name__ == '__main__':
    bottle.run(host='localhost', port=8080, debug=True)

Add a default_app object for Function Compute:

app = bottle.default_app()

Full file:

# index.py
import bottle

@bottle.route('/hello/<name>')
def index(name):
    return "Hello world"

app = bottle.default_app()

if __name__ == '__main__':
    bottle.run(host='localhost', port=8080, debug=True)

Set the function entry to index.app when creating the function.

Flask Example

# index.py
from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run(host="0.0.0.0", port=8001)

Configure the function entry as index.app to run the Flask project on Function Compute.

Custom Runtime and Container

Write a bootstrap script for a custom runtime. Example for an Express project:

#!/usr/bin/env bash
export PORT=9000
npm run start

Alternatively, upload a custom container image that complies with the platform specifications.

Deployment with Serverless Devs

Create index.py as shown above, then define a resource file:

edition: 1.0.0
name: functionApp
access: default

services:
  bottleExample:
    component: devsapp/bottle
    actions:
      pre-deploy:
        - run: pip3 install -t . -r requirements.txt
          path: ./src
    props:
      region: cn-shenzhen
      service:
        name: serverless-devs-bottle
        description: Example Bottle service
      function:
        name: bottle
        description: Bottle project
        memorySize: 256
        code:
          src: ./src
        customContainerConfig:
          command: '["python3"]'
          args: '["./bottle/index.py"]'

Deploy with the command:

s deploy

The console displays deployment progress and results.

Other Cloud Providers

On AWS, Huawei Cloud, and Tencent Cloud, deploying traditional frameworks typically requires an API gateway and a conversion layer that transforms the event and context into a WSGI‑compatible environ object.

Example conversion code for Flask on Tencent Cloud:

import sys, json
from urllib.parse import urlencode
from flask import Flask
# ... (environment construction functions) ...

class FlaskLambda(Flask):
    def __call__(self, event, context):
        if 'httpMethod' not in event:
            return super(FlaskLambda, self).__call__(event, context)
        response = LambdaResponse()
        body = next(self.wsgi_app(make_environ(event), response.start_response))
        return {
            'statusCode': response.status,
            'headers': response.response_headers,
            'body': body
        }

Because conversion can be cumbersome, many developers prefer using tools such as Serverless Devs or the Serverless Framework to automate the migration.

Conclusion

Deploying traditional web frameworks to Alibaba Cloud Function Compute is straightforward thanks to HTTP functions and triggers, offering low‑intrusion migration paths. Available options include native request integration, custom runtimes, custom containers, and developer‑tool‑based deployments, allowing developers to select the most suitable method for their needs.