Change non ascii character in an HTTP request - ruby-on-rails

Question

i have to make an http get call to an external service. By sending an address, the latitude and longitude coordinates are returned. The problem is that if the address is Russian or French I have errors like:
URI must be ascii only "http://nominatim.openstreetmap.org/?format=json&addressdetails=1&q={Barrage de G\u00E9nissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rh\u00F4ne-Alpes, Francia metropolitana, 74910, Francia}&format=json"
My code is:
url = "http://nominatim.openstreetmap.org/?format=json&addressdetails=1&q={"+ address_search +"}&format=json";
response = Faraday.get url
the variable address_search is:
Barrage de Génissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rhône-Alpes, Francia metropolitana, 74910, Francia
Faraday is just a grm in rails to make an HTTP request, nothing strange. I have to manipulate the URL. Do you have any suggestion?
EDIT:
print Rails.logger.info "body " + response.body
print Rails.logger.info response.status
print Rails.logger.info response.env.url
This is the output
body []
200
https://nominatim.openstreetmap.org/?addressdetails=1&format=json&q=Barrage+de+G%C3%A9nissiat%2C+Rue+Marcel+Paul%2C+Injoux%2C+Franclens%2C+Nantua%2C+Ain%2C+Auvergne-Rh%C3%B4ne-Alpes%2C+Francia+metropolitana%2C+74910%2C+Francia
Rendering homes/index.html.erb within layouts/application

Answer 1

The query should be encoded, you can do it manually:
query = 'Barrage de Génissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rhône-Alpes, Francia metropolitana, 74910, Francia'
address_search = URI.escape(query)
url = "https://nominatim.openstreetmap.org/?format=json&addressdetails=1&q=#{address_search}&format=json"
response = Faraday.get(url)
Or leave the job for Faraday:
query = 'Barrage de Génissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rhône-Alpes, Francia metropolitana, 74910, Francia'
connection = Faraday.new('https://nominatim.openstreetmap.org')
response = connection.get do |request|
request.params = { format: 'json', addressdetails: 1, q: query }
end
Here is the response:
=> #<Faraday::Response:0x0000556afc452060
#env=
#<struct Faraday::Env
method=:get,
body=
"[{\"place_id\":104161692,\"licence\":\"Data \xC2\xA9 OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright\",\"osm_type\":\"way\",\"osm_id\":80667335,\"boundingbox\":[\"46.0516289\",\"46.0531641\",\"5.8112371\",\"5.81
4139\"],\"lat\":\"46.0523765\",\"lon\":\"5.812744291298651\",\"display_name\":\"Barrage de G\xC3\xA9nissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rh\xC3\xB4ne-Alpes, France m\xC3\xA9tropolitaine, 74910, France\"
,\"class\":\"tourism\",\"type\":\"attraction\",\"importance\":1.7983764706069638,\"icon\":\"https://nominatim.openstreetmap.org/images/mapicons/poi_point_of_interest.p.20.png\",\"address\":{\"tourism\":\"Barrage de G\xC3\xA9nissiat\
",\"road\":\"Rue Marcel Paul\",\"suburb\":\"Injoux\",\"village\":\"Franclens\",\"municipality\":\"Nantua\",\"county\":\"Ain\",\"state\":\"Auvergne-Rh\xC3\xB4ne-Alpes\",\"country\":\"France\",\"postcode\":\"74910\",\"country_code\":\
"fr\"}}]",
url=
#<URI::HTTPS https://nominatim.openstreetmap.org/?addressdetails=1&format=json&q=Barrage+de+G%C3%A9nissiat%2C+Rue+Marcel+Paul%2C+Injoux%2C+Franclens%2C+Nantua%2C+Ain%2C+Auvergne-Rh%C3%B4ne-Alpes%2C+Francia+metropolitana%2C+74910%2C+Francia>,
request=#<struct Faraday::RequestOptions params_encoder=nil, proxy=nil, bind=nil, timeout=nil, open_timeout=nil, write_timeout=nil, boundary=nil, oauth=nil, context=nil>,
request_headers={"User-Agent"=>"Faraday v0.17.3"},
ssl=
#<struct Faraday::SSLOptions
verify=true,
ca_file=nil,
ca_path=nil,
verify_mode=nil,
cert_store=nil,
client_cert=nil,
client_key=nil,
certificate=nil,
private_key=nil,
verify_depth=nil,
version=nil,
min_version=nil,
max_version=nil>,
parallel_manager=nil,
params=nil,
response=#<Faraday::Response:0x0000556afc452060 ...>,
response_headers=
{"server"=>"nginx",
"date"=>"Thu, 15 Oct 2020 19:42:53 GMT",
"content-type"=>"application/json; charset=UTF-8",
"transfer-encoding"=>"chunked",
"connection"=>"close",
"access-control-allow-origin"=>"*",
"access-control-allow-methods"=>"OPTIONS,GET"},
status=200,
reason_phrase="OK">,
#on_complete_callbacks=[]>
Make sure that you use https schema, otherwise, you'll get a response with a redirect.

Answer 2

I use this code:
query = "Barrage de Génissiat, Rue Marcel Paul, Injoux, Franclens, Nantua, Ain, Auvergne-Rhône-Alpes, Francia metropolitana, 74910, Francia"
connection = Faraday.new('https://nominatim.openstreetmap.org')
response = connection.get do |request|
request.params = { format: 'json', addressdetails: 1, q: query }
end
print Rails.logger.info response.body
And I receive []..