Ubuntu – azure function responding with 503 or 502 error after some intervals

I have an azure function deployed which is giving this exception as follows:

Along with the above exception, I am keep getting 502 or 503 error after some intervals and then it return to its ok response i.e 200.

I am deploying the azure function via the following yml file:

name: Deploy Python project to Azure Function App



on:

  push:

    branches: ["main"]



env:

  AZURE_FUNCTIONAPP_NAME: 'my-function-name'   

  AZURE_FUNCTIONAPP_PACKAGE_PATH: '.'       

  PYTHON_VERSION: '3.9'                     



jobs:

  test:

    runs-on: ubuntu-latest



    steps:

    - uses: actions/checkout@v4

    - name: Set up Python 3.9

      uses: actions/setup-python@v3

      with:

        python-version: ${{ env.PYTHON_VERSION }}

    - name: Install dependencies

      run: |

        python -m pip install --upgrade pip

        pip install flake8 pytest

        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi

    - name: Test with pytest

      run: |

        pytest --disable-warnings



  build-and-deploy:

    runs-on: ubuntu-latest

    needs: test

    if: ${{ needs.test.result == 'success' }}

    environment: dev

    steps:

    - name: 'Checkout GitHub Action'

      uses: actions/checkout@v4



    - name: Setup Python ${{ env.PYTHON_VERSION }} Environment

      uses: actions/setup-python@v4

      with:

        python-version: ${{ env.PYTHON_VERSION }}



    - name: 'Resolve Project Dependencies Using Pip'

      shell: bash

      run: |

        pushd './${{ env.AZURE_FUNCTIONAPP_PACKAGE_PATH }}'

        python -m pip install --upgrade pip

        pip install -r requirements.txt --target=".python_packages/lib/site-packages"

        popd



    - name: 'Run Azure Functions Action'

      uses: Azure/functions-action@v1

      id: fa

      with:

        app-name: ${{ env.AZURE_FUNCTIONAPP_NAME }}

        package: ${{ env.AZURE_FUNCTIONAPP_PACKAGE_PATH }}

        publish-profile: ${{ secrets.AZURE_FUNCTIONAPP_PUBLISH_PROFILE }} # Remove publish-profile to use Azure RBAC

        scm-do-build-during-deployment: true

        enable-oryx-build: true

requirements.txt

azure-functions==1.20.0

pandas==2.2.2

pydantic==2.8.2

pydantic_core==2.20.1

pytest==8.3.2

pytest-asyncio==0.23.8

requests==2.32.3

runtime version: 4
python version: 3.9

I am trying to figure out what might be causing this exception, but the exception is persistent.

Any help would be greatly appreciated!

function_app.py

import azure.functions as func
import logging
from src.funcmain import *

app = func.FunctionApp(http_auth_level=func.AuthLevel.FUNCTION)

@app.route(route="register-account",methods=['POST'])
async def account_registration(req: func.HttpRequest) -> func.HttpResponse:
    logging.info(f'Request received from {req.url}')

    try:
        return await register_account(req=req)
    
    except Exception as e:
        logging.error(f'Error processing request: {str(e)}')
        return func.HttpResponse(f"Internal server error :{str(e)}", status_code=500)
    
@app.route(route="contact",methods=['POST'])
async def contact(req: func.HttpRequest) -> func.HttpResponse:
    logging.info(f'Request received from {req.url}')

    try:
        if req.params.get('action') == 'update':
            return await update_contact(req=req)
        
        elif req.params.get('action') == 'create':
            return await register_contact(req=req)
        
        else:
            return func.HttpResponse(f"Invalid action: {req.params.get('action')}", status_code=400)
    
    except Exception as e:
        logging.error(f'Error processing request: {str(e)}')
        return func.HttpResponse(f"Internal server error :{str(e)}", status_code=500)

@app.route(route="lead", methods=['POST'])
async def lead_operation(req: func.HttpRequest) -> func.HttpResponse:
    logging.info(f'Request received from {req.url}')
    try:
        if req.params.get('action') == 'update':
            return await update_lead(req)
        elif req.params.get('action') == 'create':
            return await create_lead(req)
        else:
            return func.HttpResponse(f"Invalid action: {req.params.get('action')}", status_code=400)
    except Exception as e:
        logging.error(f'Error processing request: {str(e)}')
        return func.HttpResponse(f"Internal server error: {str(e)}", status_code=500)

@app.route(route="offer", methods=['POST'])
async def offer_operation(req: func.HttpRequest) -> func.HttpResponse:
    logging.info(f'Request received from {req.url}')
    try:
        if req.params.get('action') == 'create':
            return await create_offer(req)
        elif req.params.get('action') == 'update':
            return await update_offer(req)
        else:
            return func.HttpResponse(f"Invalid action: {req.params.get('action')}", status_code=400)
    except Exception as e:
        logging.error(f'Error processing request: {str(e)}')
        return func.HttpResponse(f"Internal server error: {str(e)}", status_code=500)

@app.route(route="watchlist", methods=['POST'])
async def watchlist_operation(req: func.HttpRequest) -> func.HttpResponse:
    logging.info(f'Request received from {req.url}')
    try:
        if req.params.get('action') == 'create':
            return await add_watchlist(req)
        elif req.params.get('action') == 'update':
            return await update_watchlist(req)
        else:
            return func.HttpResponse(f"Invalid action: {req.params.get('action')}", status_code=400)
    except Exception as e:
        logging.error(f'Error processing request: {str(e)}')
        return func.HttpResponse(f"Internal server error: {str(e)}", status_code=500)

@app.route(route="ping", methods=['GET'])
async def ping(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Ping request received.')
    return func.HttpResponse("Service is Up!", status_code=200)