Reverts HTTP connection adapter with proxy settings

This partially reverts
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/55406. We no
longer need this as we are using the proxy settings via environment
variables
https://docs.gitlab.com/omnibus/settings/environment-variables.html#setting-custom-environment-variables.

lib/gitlab/http_connection_adapter.rb

@@ -17,14 +17,6 @@ module Gitlab
     def connection
       @uri, hostname = validate_url!(uri)
 
-      if options.key?(:http_proxyaddr)
-        proxy_uri_with_port = uri_with_port(options[:http_proxyaddr], options[:http_proxyport])
-        proxy_uri_validated = validate_url!(proxy_uri_with_port).first
-
-        @options[:http_proxyaddr] = proxy_uri_validated.omit(:port).to_s
-        @options[:http_proxyport] = proxy_uri_validated.port
-      end
-
       super.tap do |http|
         http.hostname_override = hostname if hostname
       end
@@ -53,11 +45,5 @@ module Gitlab
     def allow_settings_local_requests?
       Gitlab::CurrentSettings.allow_local_requests_from_web_hooks_and_services?
     end
-
-    def uri_with_port(address, port)
-      uri = Addressable::URI.parse(address)
-      uri.port = port if port.present?
-      uri
-    end
   end
 end

spec/lib/gitlab/http_connection_adapter_spec.rb

@@ -124,130 +124,5 @@ RSpec.describe Gitlab::HTTPConnectionAdapter do
         expect(connection.port).to eq(443)
       end
     end
-
-    context 'when proxy settings are configured' do
-      let(:options) do
-        {
-          http_proxyaddr: 'https://proxy.org',
-          http_proxyport: 1557,
-          http_proxyuser: 'user',
-          http_proxypass: 'pass'
-        }
-      end
-
-      before do
-        stub_all_dns('https://proxy.org', ip_address: '166.84.12.54')
-      end
-
-      it 'sets up the proxy settings' do
-        expect(connection.proxy_address).to eq('https://166.84.12.54')
-        expect(connection.proxy_port).to eq(1557)
-        expect(connection.proxy_user).to eq('user')
-        expect(connection.proxy_pass).to eq('pass')
-      end
-
-      context 'when the address has path' do
-        before do
-          options[:http_proxyaddr] = 'https://proxy.org/path'
-        end
-
-        it 'sets up the proxy settings' do
-          expect(connection.proxy_address).to eq('https://166.84.12.54/path')
-          expect(connection.proxy_port).to eq(1557)
-        end
-      end
-
-      context 'when the port is in the address and port' do
-        before do
-          options[:http_proxyaddr] = 'https://proxy.org:1422'
-        end
-
-        it 'sets up the proxy settings' do
-          expect(connection.proxy_address).to eq('https://166.84.12.54')
-          expect(connection.proxy_port).to eq(1557)
-        end
-
-        context 'when the port is only in the address' do
-          before do
-            options[:http_proxyport] = nil
-          end
-
-          it 'sets up the proxy settings' do
-            expect(connection.proxy_address).to eq('https://166.84.12.54')
-            expect(connection.proxy_port).to eq(1422)
-          end
-        end
-      end
-
-      context 'when it is a request to local network' do
-        before do
-          options[:http_proxyaddr] = 'http://172.16.0.0/12'
-        end
-
-        it 'raises error' do
-          expect { subject }.to raise_error(
-            Gitlab::HTTP::BlockedUrlError,
-            "URL 'http://172.16.0.0:1557/12' is blocked: Requests to the local network are not allowed"
-          )
-        end
-
-        context 'when local request allowed' do
-          before do
-            options[:allow_local_requests] = true
-          end
-
-          it 'sets up the connection' do
-            expect(connection.proxy_address).to eq('http://172.16.0.0/12')
-            expect(connection.proxy_port).to eq(1557)
-          end
-        end
-      end
-
-      context 'when it is a request to local address' do
-        before do
-          options[:http_proxyaddr] = 'http://127.0.0.1'
-        end
-
-        it 'raises error' do
-          expect { subject }.to raise_error(
-            Gitlab::HTTP::BlockedUrlError,
-            "URL 'http://127.0.0.1:1557' is blocked: Requests to localhost are not allowed"
-          )
-        end
-
-        context 'when local request allowed' do
-          before do
-            options[:allow_local_requests] = true
-          end
-
-          it 'sets up the connection' do
-            expect(connection.proxy_address).to eq('http://127.0.0.1')
-            expect(connection.proxy_port).to eq(1557)
-          end
-        end
-      end
-
-      context 'when http(s) environment variable is set' do
-        before do
-          stub_env('https_proxy' => 'https://my.proxy')
-        end
-
-        it 'sets up the connection' do
-          expect(connection.proxy_address).to eq('https://proxy.org')
-          expect(connection.proxy_port).to eq(1557)
-        end
-      end
-
-      context 'when DNS rebinding protection is disabled' do
-        before do
-          stub_application_setting(dns_rebinding_protection_enabled: false)
-        end
-
-        it 'sets up the connection' do
-          expect(connection.proxy_address).to eq('https://proxy.org')
-          expect(connection.proxy_port).to eq(1557)
-        end
-      end
-    end
   end
 end