Reverse gecoding - geopy.Nominatim module throws urlopen error [SSL: UNKNOWN PROTOCOL] - ssl

Question

I am trying to get the address details from Latitude and Longitude using geopy.Nominatim module. Am getting "<'urlopen error [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:727)>" error.
Version Details :
Python version : 2.7
geopy version : 1.23.0
geographiclib : 1.50 (Dependency with geopy)
requests : 2.25.1
chardet : 3.0.4 (Dependency with requests)
urllib3 : 1.25.10 (Dependency with requests)
idna : 2.10 (Dependency with requests)
certifi : 2020.6.20 (Dependency with requests)
Code:
=====
from geopy.geocoders.osm import Nominatim
from geopy.exc import GeocoderServiceError
def reverse(lat,long):
app = Nominatim(user_agent='reverse-geocoding')
coordinates = "{},{}".format(lat,long) # not giving the actual co-ordinates
try:
address_details = app.reverse(coordinates,language="en").raw
return address_details
except GeocoderServiceError as e1:
print (str(e1))
result = reverse(lat,long)
print(result)
================
I have used the following workarounds with the same script.Am getting "<'urlopen error [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:727)>" error
workaround 1: To use the CA bundle used by requests library:
from geopy.geocoders.osm import Nominatim
from geopy.geocoders import options
from geopy.exc import GeocoderServiceError
import ssl
import certifi
def reverse(lat,long):
ctx = ssl.create_default_context(cafile=certifi.where())
options.default_ssl_context = ctx
app = Nominatim(user_agent='reverse-geocoding')
coordinates = "{},{}".format(lat,long) # not giving the actual co-ordinates
try:
address_details = app.reverse(coordinates,language="en").raw
return address_details
except GeocoderServiceError as e1:
print (str(e1))
result = reverse(lat,long)
print(result)
Workaround 2: To disable TLS certificate verification completely:
from geopy.geocoders.osm import Nominatim
from geopy.geocoders import options
from geopy.exc import GeocoderServiceError
import ssl
def reverse(lat,long):
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
options.default_ssl_context = ctx
app = Nominatim(user_agent='reverse-geocoding')
coordinates = "{},{}".format(lat,long) # not giving the actual co-ordinates
try:
address_details = app.reverse(coordinates,language="en").raw
return address_details
except GeocoderServiceError as e1:
print (str(e1))
result = reverse(lat,long)
print(result)
Could anyone please help me to find a fix for this issue.

Answer 1

The error UNKNOWN PROTOCOL is in all probability due to the fact that your request is going via a proxy.
I looked into your code mentioned in Workaround 2. Please mention the proxy explicitly in your code. Try using below code lines:
ctx = ssl.create_default.context()
ctx.check_hostname = True
ctx.verify_mode = ssl.CERT_REQUIRED
options.default_ssl_context = ctx
proxies = {'https':'https://your-proxy-server.com:port'}
app = Nominatim(user_agent="your-agent", proxies=proxies, timeout=10)
This will also help you not to ignore SSL verification completely.