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-rw-r--r--app/workers/pubsubhubbub/delivery_worker.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/app/workers/pubsubhubbub/delivery_worker.rb b/app/workers/pubsubhubbub/delivery_worker.rb
index 511ae14b3..0e57a74b6 100644
--- a/app/workers/pubsubhubbub/delivery_worker.rb
+++ b/app/workers/pubsubhubbub/delivery_worker.rb
@@ -18,6 +18,7 @@ class Pubsubhubbub::DeliveryWorker
     return if DomainBlock.blocked?(host)
 
     headers['User-Agent']      = 'Mastodon/PubSubHubbub'
+    headers['Content-Type']    = 'application/atom+xml'
     headers['Link']            = LinkHeader.new([[api_push_url, [%w(rel hub)]], [account_url(subscription.account, format: :atom), [%w(rel self)]]]).to_s
     headers['X-Hub-Signature'] = signature(subscription.secret, payload) if subscription.secret?