I/O error on GET request for "http://python-module-1/": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)

[TEJESH]

Hello I am getting error, while accessing flask microservice with spring boot micro service, and both are connected with Eureka server finely.

I/O error on GET request for "http://python-module-1/": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)

import json

from flask import Flask, Response, make_response, jsonify
from flask_eureka import Eureka
from flask_eureka.eureka import eureka_bp

import urllib

import py_eureka_client.eureka_client as eureka_client

app = Flask(__name__)

app.config.from_object(__name__)

app.register_blueprint(eureka_bp)

eureka = Eureka(app)
#eureka.register_service(name="python-module-1")

your_rest_server_port = 9090
eureka_client.init(eureka_server="http://localhost:8761/",
                                eureka_protocol="https",
                                app_name="python-module-1",
                                instance_port=your_rest_server_port)

@app.route('/')
def home():
    #result = {'status': 'UP'}
    return "Test case"

@app.route('/health')
def health():
    result = {'status': 'UP'}
    return Response(json.dumps(result), mimetype='application/json')

@app.route('/getUser')
def get_user():
    return Response(json.dumps({'username': 'python', 'password': 'python'}),
                    mimetype='application/json')

@app.errorhandler(404)
def not_found(error):
    return make_response(jsonify({'error': 'Not found'}), 404)

if __name__ == '__main__':
    app.run(debug=True)

Above service is registered with Eureka server, but while accessing the service, it gives the I/O error.

Below is spring app function::

@RequestMapping("/some")
public class CatalogResource {

    @Autowired
    private RestTemplate restTemplate;

    // @Autowired
    // WebClient.Builder webClientBuilder;

    @RequestMapping("/")
    public ResponseEntity<?> home(){
        System.out.println("Service1 Controller Called");
        ResponseEntity<String> responseEntity = restTemplate.getForEntity("http://python-module-1/",
                String.class);
        return ResponseEntity.ok().body("Recieved Message: " + responseEntity.getBody());
        //return x;
    }

}

I tried to look everywhere, but couldn't find any solution on this problem. Please help me where I am getting wrong.

[TEJESH]

I even tried to change https://python-module-1/ instead of http://python-module-1/

still it gives me, below is full error. I included /error in my spring application too.

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sun Apr 25 20:41:35 EDT 2021
There was an unexpected error (type=Internal Server Error, status=500).
I/O error on GET request for "https://python-module-1/": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused)

[keijack]

Can you post the result in http://you-eureka-server/eureka/v2/apps ?

[TEJESH]

• above I am seeing when I access http://localhost:8761/

• when I access http://localhost:8761/eureka/v2/apps it gives me : No webpage was found for the web address: http://localhost:8761/eureka/v2/apps

• when I access http://localhost:8761/v2/apps it gives me

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Apr 26 00:00:22 EDT 2021
There was an unexpected error (type=Not Found, status=404).
No message available

I put /error in my discovery server, still same error when I do http://localhost:8761/v2/apps

[TEJESH]

I also tried to modify python file, when I put below code:

eureka.register_service(name="python-module-1")

right now, it is commented as above mentioned, that's why python file is running fine.

after adding the code, I get below error in my console:

  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_eureka/eurekaclient.py", line 129, in get_zones_from_dns
    for zone_url in list(self._get_zone_urls_from_dns('txt.%s.%s' % (self.region, self.eureka_domain_name)))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_eureka/eurekaclient.py", line 122, in _get_zone_urls_from_dns
    for zone in self._get_txt_records_from_dns(domain):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/flask_eureka/eurekaclient.py", line 116, in _get_txt_records_from_dns
    records = dns.resolver.query(domain, 'TXT')
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/dns/resolver.py", line 1132, in query
    raise_on_no_answer, source_port)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/dns/resolver.py", line 1051, in query
    raise NXDOMAIN(qnames=qnames_to_try, responses=nxdomain_responses)
dns.resolver.NXDOMAIN: None of DNS query names exist: txt.None.None., txt.None.None.home.

[TEJESH]

Hello @keijack,

Is there anything where I am going wrong?

[TEJESH]

I can easily work with two spring Microservices but it's giving

I/O error on GET request for "https://python-module-1/health/": Connection refused (Connection refused); nested exception is java.net.ConnectException: Connection refused (Connection refused) for flask microservice.

[TEJESH]

I figured it out, where I was going wrong.

I changed my init function and added below line:

instance_port=5000, instance_ip="127.0.0.1")