diff --git a/app/models/ruling_weather_setting.rb b/app/models/ruling_weather_setting.rb
index a545457..3975bb0 100644
--- a/app/models/ruling_weather_setting.rb
+++ b/app/models/ruling_weather_setting.rb
@@ -3,6 +3,9 @@ class RulingWeatherSetting
   require 'json'
   include Mongoid::Document
   include Mongoid::Timestamps
+
+  WEATHER_API_URL = "https://opendata.cwa.gov.tw".freeze
+
   field :time_offset, type: String, default: "+8"
   field :location, type: String, default: ""
   field :dataid, type: String, default: ""
@@ -37,9 +40,8 @@ class RulingWeatherSetting
   def get_now_info(custom_location=nil,custom_dataid=nil,custom_observatory_name=nil)
     time_now = DateTime.now.new_offset(self.time_offset)
     today = time_now.strftime("%Y-%m-%d")
-    host = "https://opendata.cwb.gov.tw"
     custom_dataid = custom_dataid || self.dataid
-    url = "#{host}/api/v1/rest/datastore/#{custom_dataid}.json"
+    url = "#{WEATHER_API_URL}/api/v1/rest/datastore/#{custom_dataid}.json"
     startt = "#{today}T00:00:00"
     endt = "#{today}T23:59:59"
     custom_location = custom_location || self.location
@@ -111,7 +113,7 @@ class RulingWeatherSetting
       if timeout_flag
         rain = cache["rain"].to_f rescue 0.0
       else
-        url2 = "https://opendata.cwb.gov.tw/api/v1/rest/datastore/O-A0002-001.json"
+        url2 = "#{WEATHER_API_URL}/api/v1/rest/datastore/O-A0002-001.json"
         begin
           res2 = net_http_get_response(URI.parse("#{url2}?#{data2.to_query}"))
           content2 = JSON.parse(res2.body)
@@ -147,9 +149,8 @@ class RulingWeatherSetting
   def test
     time_now = DateTime.now.utc.new_offset(self.time_offset)
     today = time_now.strftime("%Y-%m-%d")
-    host = "https://opendata.cwb.gov.tw"
     custom_dataid = custom_dataid || self.dataid
-    url = "#{host}/api/v1/rest/datastore/#{custom_dataid}.json"
+    url = "#{WEATHER_API_URL}/api/v1/rest/datastore/#{custom_dataid}.json"
     startt = "#{today}T00:00:00"
     endt = "#{today}T23:59:59"
     custom_location = custom_location || self.location