diff --git a/fasp_base/lib/fasp_base.rb b/fasp_base/lib/fasp_base.rb
index 7ca174a..92e6336 100644
--- a/fasp_base/lib/fasp_base.rb
+++ b/fasp_base/lib/fasp_base.rb
@@ -4,7 +4,6 @@
 require "fasp_base/linzer/adapter/action_dispatch/response"
 require "fasp_base/linzer/adapter/httpx/request"
 require "fasp_base/linzer/adapter/httpx/response"
-require "fasp_base/request"
 
 module FaspBase
   class Error < ::StandardError ; end
diff --git a/fasp_base/lib/fasp_base/engine.rb b/fasp_base/lib/fasp_base/engine.rb
index b950b77..0e9018c 100644
--- a/fasp_base/lib/fasp_base/engine.rb
+++ b/fasp_base/lib/fasp_base/engine.rb
@@ -5,5 +5,12 @@
 module FaspBase
   class Engine < ::Rails::Engine
     isolate_namespace FaspBase
+
+    # Require `Request` late in the boot process
+    # to enable users to install httpx's webmock
+    # integration before httpx is initialized.
+    initializer "fasp_base.require_request" do
+      require "fasp_base/request"
+    end
   end
 end
diff --git a/fasp_base/lib/fasp_base/request.rb b/fasp_base/lib/fasp_base/request.rb
index 1e8cbff..092c471 100644
--- a/fasp_base/lib/fasp_base/request.rb
+++ b/fasp_base/lib/fasp_base/request.rb
@@ -1,5 +1,5 @@
 class FaspBase::Request
-  HTTPX = ::HTTPX.plugin(:ssrf_filter)
+  HTTPX = ::HTTPX.plugin(:ssrf_filter) unless Rails.env.development?
 
   def initialize(server)
     @server = server