diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2ad4314f..af9c6bbf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,9 @@ Airbrake Changelog
 
 ### master
 
+* Rails: added support for Curb for HTTP performance breakdown
+  ([#957](https://github.com/airbrake/airbrake/pull/957))
+
 ### [v9.1.0][v9.1.0] (April 17, 2019)
 
 * Rails: added HTTP performance breakdown (`Net::HTTP` support only)
diff --git a/airbrake.gemspec b/airbrake.gemspec
index 025aa8caa..434c2b5e1 100644
--- a/airbrake.gemspec
+++ b/airbrake.gemspec
@@ -61,4 +61,6 @@ DESC
   if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.2.2')
     s.add_development_dependency 'sidekiq', '~> 5'
   end
+
+  s.add_development_dependency 'curb', '~> 0.9' if RUBY_ENGINE == 'ruby'
 end
diff --git a/lib/airbrake/rack.rb b/lib/airbrake/rack.rb
index 544012767..0be1c7f0c 100644
--- a/lib/airbrake/rack.rb
+++ b/lib/airbrake/rack.rb
@@ -8,3 +8,27 @@
 require 'airbrake/rack/route_filter'
 require 'airbrake/rack/middleware'
 require 'airbrake/rack/request_store'
+
+module Airbrake
+  # Rack is a namespace for all Rack-related code.
+  module Rack
+    # @api private
+    # @since 9.2.0
+    def self.capture_http_performance
+      routes = Airbrake::Rack::RequestStore[:routes]
+      if !routes || routes.none?
+        response = yield
+      else
+        elapsed = Airbrake::Benchmark.measure do
+          response = yield
+        end
+
+        routes.each do |_route_path, params|
+          params[:groups][:http] = elapsed
+        end
+      end
+
+      response
+    end
+  end
+end
diff --git a/lib/airbrake/rails.rb b/lib/airbrake/rails.rb
index b78bc42df..32edfd77f 100644
--- a/lib/airbrake/rails.rb
+++ b/lib/airbrake/rails.rb
@@ -63,19 +63,22 @@ class Railtie < ::Rails::Railtie
               'process_action.action_controller',
               Airbrake::Rails::ActionControllerNotifySubscriber.new
             )
-
-            # Send performance breakdown: where a request spends its time.
-            require 'airbrake/rails/action_controller_performance_breakdown_subscriber'
-            ActiveSupport::Notifications.subscribe(
-              'process_action.action_controller',
-              Airbrake::Rails::ActionControllerPerformanceBreakdownSubscriber.new
-            )
-
-            require 'airbrake/rails/net_http'
           end
         end
       end
 
+      initializer('airbrake.http_breakdown') do
+        # Send performance breakdown: where a request spends its time.
+        require 'airbrake/rails/action_controller_performance_breakdown_subscriber'
+        ActiveSupport::Notifications.subscribe(
+          'process_action.action_controller',
+          Airbrake::Rails::ActionControllerPerformanceBreakdownSubscriber.new
+        )
+
+        require 'airbrake/rails/net_http' if defined?(Net) && defined?(Net::HTTP)
+        require 'airbrake/rails/curb' if defined?(Curl) && defined?(Curl::CURB_VERSION)
+      end
+
       initializer('airbrake.active_record') do
         ActiveSupport.on_load(:active_record) do
           # Reports exceptions occurring in some bugged ActiveRecord callbacks.
diff --git a/lib/airbrake/rails/curb.rb b/lib/airbrake/rails/curb.rb
new file mode 100644
index 000000000..24eee765a
--- /dev/null
+++ b/lib/airbrake/rails/curb.rb
@@ -0,0 +1,35 @@
+module Curl
+  # Monkey-patch to measure request timing.
+  class Easy
+    alias http_without_airbrake http
+
+    def http(verb)
+      Airbrake::Rack.capture_http_performance do
+        http_without_airbrake(verb)
+      end
+    end
+
+    alias perform_without_airbrake perform
+
+    def perform(&block)
+      Airbrake::Rack.capture_http_performance do
+        perform_without_airbrake(&block)
+      end
+    end
+  end
+end
+
+module Curl
+  # Monkey-patch to measure request timing.
+  class Multi
+    class << self
+      alias http_without_airbrake http
+
+      def http(urls_with_config, multi_options = {}, &block)
+        Airbrake::Rack.capture_http_performance do
+          http_without_airbrake(urls_with_config, multi_options, &block)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/airbrake/rails/net_http.rb b/lib/airbrake/rails/net_http.rb
index 186addd63..53a2e2786 100644
--- a/lib/airbrake/rails/net_http.rb
+++ b/lib/airbrake/rails/net_http.rb
@@ -1,23 +1,10 @@
-require 'net/http'
-
 # Monkey-patch Net::HTTP to benchmark it.
 Net::HTTP.class_eval do
   alias_method :request_without_airbrake, :request
 
   def request(request, *args, &block)
-    routes = Airbrake::Rack::RequestStore[:routes]
-    if !routes || routes.none?
-      response = request_without_airbrake(request, *args, &block)
-    else
-      elapsed = Airbrake::Benchmark.measure do
-        response = request_without_airbrake(request, *args, &block)
-      end
-
-      routes.each do |route_path, _params|
-        Airbrake::Rack::RequestStore[:routes][route_path][:groups][:http] = elapsed
-      end
+    Airbrake::Rack.capture_http_performance do
+      request_without_airbrake(request, *args, &block)
     end
-
-    response
   end
 end
diff --git a/spec/apps/rails/dummy_app.rb b/spec/apps/rails/dummy_app.rb
index 615441663..dabed40f7 100644
--- a/spec/apps/rails/dummy_app.rb
+++ b/spec/apps/rails/dummy_app.rb
@@ -1,3 +1,5 @@
+require 'curb' unless Airbrake::JRUBY
+
 class DummyApp < Rails::Application
   # Rails requires these two keys.
   config.session_store :cookie_store, key: 'jiez4Mielu1AiHugog3shiiPhe3lai3faer'
@@ -33,6 +35,9 @@ class DummyApp < Rails::Application
     get '/breakdown' => 'dummy#breakdown'
     get '/breakdown_view_only' => 'dummy#breakdown_view_only'
     get '/breakdown_http' => 'dummy#breakdown_http'
+    get '/breakdown_curl_http' => 'dummy#breakdown_curl_http'
+    get '/breakdown_curl_http_easy' => 'dummy#breakdown_curl_http_easy'
+    get '/breakdown_curl_http_multi' => 'dummy#breakdown_curl_http_multi'
     get '/notify_airbrake_helper' => 'dummy#notify_airbrake_helper'
     get '/notify_airbrake_sync_helper' => 'dummy#notify_airbrake_sync_helper'
     get '/active_record_after_commit' => 'dummy#active_record_after_commit'
@@ -106,7 +111,10 @@ class DummyController < ActionController::Base
       'dummy/delayed_job.html.erb' => 'delayed_job',
       'dummy/breakdown.html.erb' => 'breakdown',
       'dummy/breakdown_view_only.html.erb' => 'breakdown_view_only',
-      'dummy/breakdown_http.html.erb' => 'breakdown_http'
+      'dummy/breakdown_http.html.erb' => 'breakdown_http',
+      'dummy/breakdown_curl_http.html.erb' => 'breakdown_curl_http',
+      'dummy/breakdown_curl_http_easy.html.erb' => 'breakdown_curl_http_easy',
+      'dummy/breakdown_curl_http_multi.html.erb' => 'breakdown_curl_http_multi'
     )
   ]
 
@@ -131,6 +139,21 @@ def breakdown_http
     render 'dummy/breakdown_http.html.erb'
   end
 
+  def breakdown_curl_http
+    Curl.get('example.com')
+    render 'dummy/breakdown_curl_http.html.erb'
+  end
+
+  def breakdown_curl_http_easy
+    Curl::Easy.perform('example.com')
+    render 'dummy/breakdown_curl_http_easy.html.erb'
+  end
+
+  def breakdown_curl_http_multi
+    Curl::Multi.get(['example.com'])
+    render 'dummy/breakdown_curl_http_multi.html.erb'
+  end
+
   def notify_airbrake_helper
     notify_airbrake(AirbrakeTestError.new)
   end
diff --git a/spec/integration/rails/rails_spec.rb b/spec/integration/rails/rails_spec.rb
index 58da1c302..604f6a85a 100644
--- a/spec/integration/rails/rails_spec.rb
+++ b/spec/integration/rails/rails_spec.rb
@@ -322,7 +322,7 @@
       end
     end
 
-    context "when an action performs a HTTP request" do
+    context "when an action performs a Net::HTTP request" do
       let!(:example_request) do
         stub_request(:get, 'http://example.com').to_return(body: '')
       end
@@ -334,5 +334,45 @@
         expect(example_request).to have_been_made
       end
     end
+
+    context "when an action performs a Curl request" do
+      let!(:example_request) do
+        stub_request(:get, 'http://example.com').to_return(body: '')
+      end
+
+      before { skip("JRuby doesn't support Curb") if Airbrake::JRUBY }
+
+      it "includes the http breakdown" do
+        expect(Airbrake).to receive(:notify_performance_breakdown)
+          .with(hash_including(groups: { view: be > 0, http: be > 0 }))
+        get '/breakdown_curl_http'
+        expect(example_request).to have_been_made
+      end
+    end
+
+    context "when an action performs a Curl::Easy request" do
+      let!(:example_request) do
+        stub_request(:get, 'http://example.com').to_return(body: '')
+      end
+
+      before { skip("JRuby doesn't support Curb") if Airbrake::JRUBY }
+
+      it "includes the http breakdown" do
+        expect(Airbrake).to receive(:notify_performance_breakdown)
+          .with(hash_including(groups: { view: be > 0, http: be > 0 }))
+        get '/breakdown_curl_http_easy'
+        expect(example_request).to have_been_made
+      end
+    end
+
+    context "when an action performs a Curl::Multi request" do
+      before { skip("JRuby doesn't support Curb") if Airbrake::JRUBY }
+
+      it "includes the http breakdown" do
+        expect(Airbrake).to receive(:notify_performance_breakdown)
+          .with(hash_including(groups: { view: be > 0, http: be > 0 }))
+        get '/breakdown_curl_http_multi'
+      end
+    end
   end
 end
diff --git a/spec/unit/rack/rack_spec.rb b/spec/unit/rack/rack_spec.rb
new file mode 100644
index 000000000..168967f4e
--- /dev/null
+++ b/spec/unit/rack/rack_spec.rb
@@ -0,0 +1,37 @@
+RSpec.describe Airbrake::Rack do
+  describe ".capture_http_performance" do
+    context "when request store doesn't have any routes" do
+      before { Airbrake::Rack::RequestStore.clear }
+
+      it "doesn't store http time" do
+        described_class.capture_http_performance {}
+        expect(Airbrake::Rack::RequestStore.store).to be_empty
+      end
+
+      it "returns what the given block returns" do
+        expect(described_class.capture_http_performance { 1 }).to eq(1)
+      end
+    end
+
+    context "when request store has a route" do
+      let(:routes) { Airbrake::Rack::RequestStore[:routes] }
+
+      before do
+        Airbrake::Rack::RequestStore[:routes] = {
+          '/about' => {
+            method: 'GET',
+            response_type: :html,
+            groups: {}
+          }
+        }
+      end
+
+      after { Airbrake::Rack::RequestStore.clear }
+
+      it "attaches http timing to the route" do
+        described_class.capture_http_performance {}
+        expect(routes['/about'][:groups][:http]).to be > 0
+      end
+    end
+  end
+end