Replace the Net::HTTP adapter by a separate gem

The Net::HTTP adapter is extracted into its own gem. The idea behind this change is to create an ecosystem of different packages that you can use with Faraday, so that Faraday doesn’t have to ship with the packages itself.

For now all the Net::HTTP tests are still in place to verify that everything is working correctly.

faraday.gemspec

@@ -20,6 +20,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'multipart-post', '>= 1.2', '< 3'
   spec.add_dependency 'ruby2_keywords'
+  spec.add_dependency 'faraday-net_http', '~> 0.0.5'
 
   # Includes `examples` and `spec` to allow external adapter gems to run Faraday unit and integration tests
   spec.files = Dir['CHANGELOG.md', '{examples,lib,spec}/**/*', 'LICENSE.md', 'Rakefile', 'README.md']

lib/faraday.rb

@@ -6,6 +6,8 @@
 require 'faraday/middleware_registry'
 require 'faraday/dependency_loader'
 
+require 'faraday/net_http'
+
 # This is the main namespace for Faraday.
 #
 # It provides methods to create {Connection} objects, and HTTP-related

lib/faraday/adapter.rb

@@ -11,7 +11,6 @@ class Adapter
 
     register_middleware File.expand_path('adapter', __dir__),
                         test: [:Test, 'test'],
-                        net_http: [:NetHttp, 'net_http'],
                         net_http_persistent: [
                           :NetHttpPersistent,
                           'net_http_persistent'

lib/faraday/adapter/net_http_persistent.rb

@@ -5,6 +5,7 @@ class Adapter
     # Net::HTTP::Persistent adapter.
     class NetHttpPersistent < NetHttp
       dependency 'net/http/persistent'
+      dependency 'net/http/persistent'
 
       private
 

lib/faraday/autoload.rb

@@ -58,7 +58,6 @@ def all_loaded_constants
   class Adapter
     extend AutoloadHelper
     autoload_all 'faraday/adapter',
-                 NetHttp: 'net_http',
                  NetHttpPersistent: 'net_http_persistent',
                  EMSynchrony: 'em_synchrony',
                  EMHttp: 'em_http',