fix(http_requester): use host url as connections cache key

lib/algolia/http/http_requester.rb

@@ -65,7 +65,7 @@ def send_request(host, method, path, body, headers, timeout, connect_timeout)
       # @return [Faraday::Connection]
       #
       def connection(host)
-        @connections[host.accept] ||= Faraday.new(build_url(host)) do |f|
+        @connections[host.url] ||= Faraday.new(build_url(host)) do |f|
           f.adapter @adapter.to_sym
         end
       end

test/algolia/unit/http_requester_test.rb

@@ -0,0 +1,27 @@
+require 'algolia'
+require 'test_helper'
+
+class HttpRequesterTest
+  describe 'connection' do
+    def test_caches_http_client_connections
+      requester = Algolia::Http::HttpRequester.new(Defaults::ADAPTER, nil)
+      host1     = Algolia::Transport::StatefulHost.new('host1')
+
+      # rubocop:disable Lint/UselessComparison
+      assert requester.connection(host1) == requester.connection(host1)
+      # rubocop:enable Lint/UselessComparison
+      assert_equal requester.connection(host1).url_prefix.host, 'host1'
+    end
+
+    def test_caches_hosts_independent_of_each_other
+      requester = Algolia::Http::HttpRequester.new(Defaults::ADAPTER, nil)
+      host1     = Algolia::Transport::StatefulHost.new('host1')
+      host2     = Algolia::Transport::StatefulHost.new('host2')
+
+      assert requester.connection(host1) != requester.connection(host2)
+
+      assert_equal requester.connection(host1).url_prefix.host, 'host1'
+      assert_equal requester.connection(host2).url_prefix.host, 'host2'
+    end
+  end
+end