Set a 'Host' header on unix sockets

Workaround for a bug in the HTTPUNIX client.

lib/gitlab_net.rb

@@ -159,6 +159,12 @@ class GitlabNet
 
     request.set_form_data(params.merge(secret_token: secret_token))
 
+    if uri.is_a?(URI::HTTPUNIX)
+      # The HTTPUNIX HTTP client does not set a correct Host header. This can
+      # lead to 400 Bad Request responses.
+      request['Host'] = 'localhost'
+    end
+
     request
   end
 

spec/gitlab_net_spec.rb

@@ -248,6 +248,7 @@ describe GitlabNet, vcr: true do
   end
 
   describe :http_request_for do
+    context 'with stub' do
       let(:get) do
         double(Net::HTTP::Get).tap do |get|
           Net::HTTP::Get.stub(:new) { get }
@@ -268,6 +269,18 @@ describe GitlabNet, vcr: true do
       it { should_not be_nil }
     end
 
+    context 'Unix socket' do
+      it 'sets the Host header to "localhost"' do
+        gitlab_net = described_class.new
+        gitlab_net.should_receive(:secret_token).and_return('a123')
+
+        request = gitlab_net.send(:http_request_for, :get, URI('http+unix://%2Ffoo'))
+
+        expect(request['Host']).to eq('localhost')
+      end
+    end
+  end
+
   describe :cert_store do
     let(:store) do
       double(OpenSSL::X509::Store).tap do |store|