Fix not being able to resolve public resources in development environment (#13505)

app/services/fetch_resource_service.rb

@@ -25,7 +25,18 @@ class FetchResourceService < BaseService
   end
 
   def perform_request(&block)
-    Request.new(:get, @url).add_headers('Accept' => ACCEPT_HEADER).on_behalf_of(Account.representative).perform(&block)
+    Request.new(:get, @url).tap do |request|
+      request.add_headers('Accept' => ACCEPT_HEADER)
+
+      # In a real setting we want to sign all outgoing requests,
+      # in case the remote server has secure mode enabled and requires
+      # authentication on all resources. However, during development,
+      # sending request signatures with an inaccessible host is useless
+      # and prevents even public resources from being fetched, so
+      # don't do it
+
+      request.on_behalf_of(Account.representative) unless Rails.env.development?
+    end.perform(&block)
   end
 
   def process_response(response, terminal = false)

spec/services/fetch_resource_service_spec.rb

@@ -21,7 +21,11 @@ RSpec.describe FetchResourceService, type: :service do
 
     context 'when OpenSSL::SSL::SSLError is raised' do
       before do
-        allow(Request).to receive_message_chain(:new, :add_headers, :on_behalf_of, :perform).and_raise(OpenSSL::SSL::SSLError)
+        request = double()
+        allow(Request).to receive(:new).and_return(request)
+        allow(request).to receive(:add_headers)
+        allow(request).to receive(:on_behalf_of)
+        allow(request).to receive(:perform).and_raise(OpenSSL::SSL::SSLError)
       end
 
       it { is_expected.to be_nil }
@@ -29,7 +33,11 @@ RSpec.describe FetchResourceService, type: :service do
 
     context 'when HTTP::ConnectionError is raised' do
       before do
-        allow(Request).to receive_message_chain(:new, :add_headers, :on_behalf_of, :perform).and_raise(HTTP::ConnectionError)
+        request = double()
+        allow(Request).to receive(:new).and_return(request)
+        allow(request).to receive(:add_headers)
+        allow(request).to receive(:on_behalf_of)
+        allow(request).to receive(:perform).and_raise(HTTP::ConnectionError)
       end
 
       it { is_expected.to be_nil }