Close http connection in perform method of Request class (#6889)

HTTP connections must be explicitly closed in many cases, and letting
perform method close connections makes its callers less redundant and
prevent them from forgetting to close connections.

app/workers/pubsubhubbub/delivery_worker.rb

@@ -23,22 +23,17 @@ class Pubsubhubbub::DeliveryWorker
   private
 
   def process_delivery
-    payload_delivery
+    callback_post_payload do |payload_delivery|
+      raise Mastodon::UnexpectedResponseError, payload_delivery unless response_successful? payload_delivery
+    end
 
-    raise Mastodon::UnexpectedResponseError, payload_delivery unless response_successful?
-
-    payload_delivery.connection&.close
     subscription.touch(:last_successful_delivery_at)
   end
 
-  def payload_delivery
-    @_payload_delivery ||= callback_post_payload
-  end
-
-  def callback_post_payload
+  def callback_post_payload(&block)
     request = Request.new(:post, subscription.callback_url, body: payload)
     request.add_headers(headers)
-    request.perform
+    request.perform(&block)
   end
 
   def blocked_domain?
@@ -80,7 +75,7 @@ class Pubsubhubbub::DeliveryWorker
     OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha1'), subscription.secret, payload)
   end
 
-  def response_successful?
+  def response_successful?(payload_delivery)
     payload_delivery.code > 199 && payload_delivery.code < 300
   end
 end