diff --git a/app/models/opengraph/fetch.rb b/app/models/opengraph/fetch.rb
index bd628127..2c3a40ff 100644
--- a/app/models/opengraph/fetch.rb
+++ b/app/models/opengraph/fetch.rb
@@ -23,11 +23,14 @@ class Opengraph::Fetch
   end
 
   private
+    # The nil proxy address ignores http_proxy: a proxy would look the host up again, and the connection
+    # would no longer go to the checked IP.
+    #
     # The timeouts bound each operation. A host can still send its headers or body a byte at a time,
     # in as many reads as it likes: UnfurlLinksController puts the whole unfurl under one deadline.
     def request(url, request_class, ip:)
       MAX_REDIRECTS.times do
-        Net::HTTP.start(url.host, url.port, ipaddr: ip, use_ssl: url.scheme == "https", **timeouts) do |http|
+        Net::HTTP.start(url.host, url.port, nil, ipaddr: ip, use_ssl: url.scheme == "https", **timeouts) do |http|
           http.request request_class.new(url) do |response|
             if response.is_a?(Net::HTTPRedirection)
               url, ip = resolve_redirect(response["location"])
diff --git a/test/models/opengraph/fetch_test.rb b/test/models/opengraph/fetch_test.rb
index dc510cc5..561d2cf0 100644
--- a/test/models/opengraph/fetch_test.rb
+++ b/test/models/opengraph/fetch_test.rb
@@ -74,6 +74,23 @@ class Opengraph::FetchTest < ActiveSupport::TestCase
     end
   end
 
+  test "#fetch_document connects to the resolved IP even when a proxy is configured" do
+    url = URI.parse("http://www.example.com/")
+    saved = ENV.slice("http_proxy", "HTTP_PROXY")
+    %w[ http_proxy HTTP_PROXY ].each { |k| ENV[k] = "http://proxy.internal:3128" }
+
+    WebMock.disable_net_connect! allow: [ url.host ]
+    TCPSocket.expects(:open).with { |*args, **| args.first == "proxy.internal" }.never
+    TCPSocket.expects(:open).with { |*args, **| args.first == "1.2.3.4" && args[1] == 80 }.throws(:not_proxied)
+
+    assert_throws :not_proxied do
+      @fetch.fetch_document(url, ip: "1.2.3.4")
+    end
+  ensure
+    %w[ http_proxy HTTP_PROXY ].each { |k| ENV.delete(k) }
+    saved.each { |k, v| ENV[k] = v }
+  end
+
   test "#fetch_document is empty following redirects that never finish" do
     WebMock.stub_request(:get, "https://www.example.com/")
       .to_return(status: 302, headers: { location: "https://www.example.com/" })