add support for proxy

lib/simple_segment/request.rb

@@ -23,6 +23,7 @@ def post(path, payload, headers: DEFAULT_HEADERS) # rubocop:disable Metrics/AbcS
       status_code = nil
       response_body = nil
 
+      uri = URI(BASE_URL)
       payload = JSON.generate(payload)
       if stub
         logger.debug "stubbed request to \
@@ -31,32 +32,19 @@ def post(path, payload, headers: DEFAULT_HEADERS) # rubocop:disable Metrics/AbcS
 
         { status: 200, error: nil }
       else
-        request = Net::HTTP::Post.new(path, headers)
-        request.basic_auth write_key, nil
-        connection.request(request, payload).tap do |res|
-          status_code = res.code
-          response_body = res.body
-          response = res
-          response.value
+        Net::HTTP.start(uri.host, uri.port, :ENV, http_options) do |http|
+          request = Net::HTTP::Post.new(path, headers)
+          request.basic_auth write_key, nil
+          http.request(request, payload).tap do |res|
+            status_code = res.code
+            response_body = res.body
+            response = res
+            response.value
+          end
         end
       end
     rescue StandardError => e
       error_handler.call(status_code, response_body, e, response)
     end
-
-    private
-
-    def connection
-      uri = URI(BASE_URL)
-
-      http = Net::HTTP.new(uri.host, uri.port)
-
-      http_options.each do |key, value|
-        writer = "#{key}="
-        http.public_send(writer, value) if http.respond_to? writer
-      end
-
-      http
-    end
   end
 end