Merge branch 'default_http_user_agent'

app/concerns/web_request_concern.rb

@@ -58,7 +58,12 @@ module WebRequestConcern
   end
 
   def user_agent
-    interpolated['user_agent'].presence ||
+    interpolated['user_agent'].presence || self.class.default_user_agent
+  end
+
+  module ClassMethods
+    def default_user_agent
       ENV.fetch('DEFAULT_HTTP_USER_AGENT', Faraday.new.headers[:user_agent])
+    end
   end
 end

app/models/agents/website_agent.rb

@@ -50,7 +50,7 @@ module Agents
 
       Set `force_encoding` to an encoding name if the website does not return a Content-Type header with a proper charset.
 
-      Set `user_agent` to a custom User-Agent name if the website does not like the default value ("Faraday v#{Faraday::VERSION}").
+      Set `user_agent` to a custom User-Agent name if the website does not like the default value (`#{default_user_agent}`).
 
       The `headers` field is optional.  When present, it should be a hash of headers to send with the request.