Update default config for error variable changes.

This is part of 18F/api.data.gov#281

The associated changes are on the gatekeeper project's
6d2e6574998ff0478481d7ff7f0b327019006e05 commit.

config/default.yml

@@ -201,42 +201,45 @@ apiSettings:
         </body>
       </html>
   error_data:
+    common:
+      signup_url: "{{base_url}}"
+      contact_url: "{{base_url}}/contact/"
     not_found:
       status_code: 404
       code: NOT_FOUND
       message: The requested URL was not found on this server.
     api_key_missing:
       status_code: 403
       code: API_KEY_MISSING
-      message: No api_key was supplied. Get one at {{baseUrl}}
+      message: No api_key was supplied. Get one at {{signup_url}}
     api_key_invalid:
       status_code: 403
       code: API_KEY_INVALID
-      message: An invalid api_key was supplied. Get one at {{baseUrl}}
+      message: An invalid api_key was supplied. Get one at {{signup_url}}
     api_key_disabled:
       status_code: 403
       code: API_KEY_DISABLED
-      message: The api_key supplied has been disabled. Contact us at {{baseUrl}}/contact for assistance
+      message: The api_key supplied has been disabled. Contact us at {{contact_url}} for assistance
     api_key_unverified:
       status_code: 403
       code: API_KEY_UNVERIFIED
-      message: The api_key supplied has not been verified yet. Please check your e-mail to verify the API key. Contact us at {{baseUrl}}/contact for assistance
+      message: The api_key supplied has not been verified yet. Please check your e-mail to verify the API key. Contact us at {{contact_url}} for assistance
     api_key_unauthorized:
       status_code: 403
       code: API_KEY_UNAUTHORIZED
-      message: The api_key supplied is not authorized to access the given service. Contact us at {{baseUrl}}/contact for assistance
+      message: The api_key supplied is not authorized to access the given service. Contact us at {{contact_url}} for assistance
     over_rate_limit:
       status_code: 429
       code: OVER_RATE_LIMIT
-      message: You have exceeded your rate limit. Try again later or contact us at {{baseUrl}}/contact for assistance
+      message: You have exceeded your rate limit. Try again later or contact us at {{contact_url}} for assistance
     internal_server_error:
       status_code: 500
       code: INTERNAL_SERVER_ERROR
-      message: An unexpected error has occurred. Try again later or contact us at {{baseUrl}}/contact for assistance
+      message: An unexpected error has occurred. Try again later or contact us at {{contact_url}} for assistance
     https_required:
       status_code: 400
       code: HTTPS_REQUIRED
-      message: "Requests must be made over HTTPS. Try accessing the API at: {{httpsUrl}}"
+      message: "Requests must be made over HTTPS. Try accessing the API at: {{https_url}}"
 ban:
   user_agents:
   ips: