doc: proxy feature is experimental

README.md

@@ -45,7 +45,7 @@ Fcmpush.configure do |config|
   config.server_key = 'your firebase server key'
   # Or set environment variables
   # ENV['FCM_SERVER_KEY'] = 'your firebase server key'
-  
+
   # Proxy ENV variables are considered by default if set by net/http, but you can explicitly define your proxy host here
   # user and password are optional
   # config.proxy = { uri: "http://proxy.host:3128", user: nil, password: nil }
@@ -152,6 +152,10 @@ Comparison:
 firebase_cloud_messenger:        3.2 i/s - 5.94x  (± 0.00) slower
 ```
 
+## Experimental Features
+- proxy
+    - LIMITATION: support `http_proxy` only. NOT supports `HTTPS_PROXY`.
+
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/miyataka/fcmpush.

lib/fcmpush/client.rb

@@ -25,6 +25,7 @@ def initialize(domain, project_id, configuration, **options)
       @access_token_expiry = Time.now.utc + access_token_response['expires_in']
       @server_key = configuration.server_key
       @connection = Net::HTTP::Persistent.new
+
       if configuration.proxy && configuration.proxy[:uri]
         uri = URI(configuration.proxy[:uri])
         # user name must not be a empty string, password can

lib/fcmpush/configuration.rb

@@ -16,6 +16,12 @@ def initialize
 
       # regacy auth
       @server_key = ENV['FCM_SERVER_KEY']
+
+      # THIS IS EXPERIMENTAL
+      # NOT support `HTTPS_PROXY` environment variable. This feature not tested well on CI.
+      # cf. https://github.com/miyataka/fcmpush/pull/39#issuecomment-1722533622
+      # proxy
+      @proxy = :ENV
     end
   end
 end