How to check if server is available before request.urlopen in Python?

Question

I have the following HTTP request code on my server in my python code:

import urllib.request
import json

url= urllib.request.urlopen('http://ENDERECOIP/pasta/arquivo.php')
x= url.read()
y = json.loads(x.decode('utf-8'))
teste = y['valor']
print(teste)

The code works and returns the value but I wanted to do a previous check in case the server is not available it returns a message "Server unavailable".

Answer 1

You can just use one try and except, thus:

import urllib.request
import json

try:
    url= urllib.request.urlopen('http://ENDERECOIP/pasta/arquivo.php')
    x= url.read()
    y = json.loads(x.decode('utf-8'))
    teste = y['valor']
    print(teste)

except Exception as e:
    print("Servidor indisponível. Erro:", e)

The urlopen can only complete the request with the active server.

Answer 2

The easiest and easiest way to do this is by using the library requests. Use the function requests.get passing the url you want to check. This function will return an object of Response containing the attribute status_code. To know if everything is right, just check the code returned in the answer. Example:

import requests
url = "https://www.youtube.com"

if requests.get(url).status_code == 200:
    print("O servidor está disponível.")
else:
    print("O servidor está indisponível.")

Obviously there are many other ways to check whether a server is available or not, but in my opinion, this form is the simplest.