Allow HTTP protocol for Nominatim lookup

but default to HTTPS (custom hosts may not support HTTPS).
This partially reverts 7cb0acc9.

lib/geocoder/lookups/location_iq.rb

@@ -13,15 +13,15 @@ module Geocoder::Lookup
     
     def query_url(query)
       method = query.reverse_geocode? ? "reverse" : "search"
-      "#{protocol}://locationiq.org/v1/#{method}.php?key=#{configuration.api_key}&" + url_query_string(query)
-    end
-
-    def supported_protocols
-      [:http, :https]
+      "#{protocol}://#{configured_host}/v1/#{method}.php?key=#{configuration.api_key}&" + url_query_string(query)
     end
 
     private
 
+    def configured_host
+      configuration[:host] || "locationiq.org"
+    end
+
     def results(query)
       return [] unless doc = fetch_data(query)
 

lib/geocoder/lookups/nominatim.rb

@@ -14,15 +14,23 @@ module Geocoder::Lookup
 
     def query_url(query)
       method = query.reverse_geocode? ? "reverse" : "search"
-      host = configuration[:host] || "nominatim.openstreetmap.org"
-      "#{protocol}://#{host}/#{method}?" + url_query_string(query)
+      "#{protocol}://#{configured_host}/#{method}?" + url_query_string(query)
     end
 
-    def supported_protocols
-      [:https]
+    private # ---------------------------------------------------------------
+
+    def configured_host
+      configuration[:host] || "nominatim.openstreetmap.org"
     end
 
-    private # ---------------------------------------------------------------
+    def use_ssl?
+      # nominatim.openstreetmap.org redirects HTTP requests to HTTPS
+      if configured_host == "nominatim.openstreetmap.org"
+        true
+      else
+        super
+      end
+    end
 
     def results(query)
       return [] unless doc = fetch_data(query)

test/unit/lookups/nominatim_test.rb

@@ -37,7 +37,7 @@ class NominatimTest < GeocoderTestCase
   def test_host_configuration
     Geocoder.configure(nominatim: {host: "local.com"})
     query = Geocoder::Query.new("Bluffton, SC")
-    assert_match %r(https://local\.com), query.url
+    assert_match %r(http://local\.com), query.url
   end
 
   def test_raises_exception_when_over_query_limit