heroku Connection timed out (Connection timed out)

Question

Hello everyone I want to someone till me if what I 'am doing is correct or not what I 'am trying to do is deploying spring boot in heroku and getting date from python (flask) framework which I 'am running it locally in my device, everything is woking fine locally in my device but when try to run spring boot in heroku I 'am getting this error at=error code=H12 desc="Request timeout" method=GET path="/hi" host=java-be.herokuapp.com request_id=454eaa9f-b9e3-4c03-9e7d-4bf5b6c450a9 fwd="5.45.134.17" dyno=web.1 connect=0ms service=30001ms status=503 bytes=0 protocol=http

and this error shows in heroku logs:

org.springframework.web.client.ResourceAccessException:
 I/O error on GET request for "http://192.168.43.142:5000/":
 Connection timed out (Connection timed out); nested exception
 is java.net.ConnectException:
 Connection timed out (Connection timed out)

My spring boot code:

 @GetMapping("/")
    String home() throws URISyntaxException {
        try {
            RestTemplate restTemplate = new RestTemplate();

            String url = "http://192.168.43.142:5000/"; // flask local host url
            String helloWorld= restTemplate.getForObject(url, String.class);
            SimpleClientHttpRequestFactory rf =(SimpleClientHttpRequestFactory) restTemplate.getRequestFactory();
            rf.setReadTimeout(1000);
            rf.setConnectTimeout(1000);
            return helloWorld;

        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";
    }

And here's my flask code:

from flask import Flask
from waitress import serve

app = Flask(__name__)

@app.route('/', methods=['GET'])
def home():
    return "hello world"


if __name__ == '__main__':
    try:
        from waitress import serve
        serve(app, host="0.0.0.0", port="5000")
    except:
        print("unexpected error")

Also when I run heroku server locally it's working fine as well.

Answer 1

have you already configured the gunicorn package to deploy on heroku?

pip3 install flask gunicorn

and create the Procfile file and add:

web: gunicorn wsgi:app

Follow the link to How to Deploy: https://dev.to/techparida/how-to-deploy-a-flask-app-on-heroku-heb