diff --git a/test/open-uri/test_open-uri.rb b/test/open-uri/test_open-uri.rb
index 5f8454dd31..ee39dbc4cc 100644
--- a/test/open-uri/test_open-uri.rb
+++ b/test/open-uri/test_open-uri.rb
@@ -1,186 +1,14 @@
 # frozen_string_literal: true
 require 'test/unit'
 require 'open-uri'
-require 'socket'
-require 'base64'
+require_relative 'utils'
 begin
   require 'zlib'
 rescue LoadError
 end
 
-class SimpleHTTPServer
-  def initialize(bind_addr, port, log)
-    @server = TCPServer.new(bind_addr, port)
-    @log = log
-    @procs = {}
-  end
-
-  def mount_proc(path, proc)
-    @procs[path] = proc
-  end
-
-  def start
-    @thread = Thread.new do
-      loop do
-        client = @server.accept
-        handle_request(client)
-        client.close
-      end
-    end
-  end
-
-  def shutdown
-    @thread.kill
-    @server.close
-  end
-
-  private
-
-  def handle_request(client)
-    request_line = client.gets
-    return if request_line.nil?
-
-    method, path, _ = request_line.split
-    headers = {}
-    while (line = client.gets) && line != "\r\n"
-      key, value = line.split(": ", 2)
-      headers[key.downcase] = value.strip
-    end
-
-    if @procs.key?(path) || @procs.key?("#{path}/")
-      proc = @procs[path] || @procs["#{path}/"]
-      req = Request.new(method, path, headers)
-      res = Response.new(client)
-      proc.call(req, res)
-      res.finish
-    else
-      @log << "ERROR `#{path}' not found"
-      client.print "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n"
-    end
-  rescue ::TestOpenURI::Unauthorized => e
-    @log << "ERROR Unauthorized"
-    client.print "HTTP/1.1 401 Unauthorized\r\nContent-Length: 0\r\n\r\n"
-  end
-
-  class Request
-    attr_reader :method, :path, :headers
-    def initialize(method, path, headers)
-      @method = method
-      @path = path
-      @headers = headers
-      parse_basic_auth
-    end
-
-    def [](key)
-      @headers[key.downcase]
-    end
-
-    def []=(key, value)
-      @headers[key.downcase] = value
-    end
-
-    private
-
-    def parse_basic_auth
-      auth = @headers['Authorization']
-      return unless auth && auth.start_with?('Basic ')
-
-      encoded_credentials = auth.split(' ', 2).last
-      decoded_credentials = Base64.decode64(encoded_credentials)
-      @username, @password = decoded_credentials.split(':', 2)
-    end
-  end
-
-  class Response
-    attr_accessor :body, :headers, :status, :chunked, :cookies
-    def initialize(client)
-      @client = client
-      @body = ""
-      @headers = {}
-      @status = 200
-      @chunked = false
-      @cookies = []
-    end
-
-    def [](key)
-      @headers[key.downcase]
-    end
-
-    def []=(key, value)
-      @headers[key.downcase] = value
-    end
-
-    def write_chunk(chunk)
-      return unless @chunked
-      @client.write("#{chunk.bytesize.to_s(16)}\r\n")
-      @client.write("#{chunk}\r\n")
-    end
-
-    def finish
-      @client.write build_response_headers
-      if @chunked
-        write_chunk(@body)
-        @client.write "0\r\n\r\n"
-      else
-        @client.write @body
-      end
-    end
-
-    private
-
-    def build_response_headers
-      response = "HTTP/1.1 #{@status} #{status_message(@status)}\r\n"
-      if @chunked
-        @headers['Transfer-Encoding'] = 'chunked'
-      else
-        @headers['Content-Length'] = @body.bytesize.to_s
-      end
-      @headers.each do |key, value|
-        response << "#{key}: #{value}\r\n"
-      end
-      @cookies.each do |cookie|
-        response << "Set-Cookie: #{cookie}\r\n"
-      end
-      response << "\r\n"
-      response
-    end
-
-    def status_message(code)
-      case code
-      when 200 then 'OK'
-      when 301 then 'Moved Permanently'
-      else 'Unknown'
-      end
-    end
-  end
-end
-
 class TestOpenURI < Test::Unit::TestCase
-  class Unauthorized < StandardError; end
-
-  def with_http(log_tester=lambda {|log| assert_equal([], log) })
-    log = []
-    srv = SimpleHTTPServer.new('localhost', 0, log)
-
-    server_thread = srv.start
-    server_thread2 = Thread.new {
-      server_thread.join
-      if log_tester
-        log_tester.call(log)
-      end
-    }
-
-    port = srv.instance_variable_get(:@server).addr[1]
-
-    client_thread = Thread.new {
-      begin
-        yield srv, "http://localhost:#{port}", server_thread, log
-      ensure
-        srv.shutdown
-      end
-    }
-    assert_join_threads([client_thread, server_thread2])
-  end
+  include TestOpenURIUtils
 
   def test_200_uri_open
     with_http {|srv, url|
diff --git a/test/open-uri/test_proxy.rb b/test/open-uri/test_proxy.rb
index 2b503d907e..4c651583f3 100644
--- a/test/open-uri/test_proxy.rb
+++ b/test/open-uri/test_proxy.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 require 'test/unit'
 require 'open-uri'
+require_relative 'utils'
 require 'webrick'
 require 'webrick/httpproxy'
 begin
@@ -9,44 +10,13 @@ rescue LoadError
 end
 
 class TestOpenURIProxy < Test::Unit::TestCase
+  include TestOpenURIUtils
 
   NullLog = Object.new
   def NullLog.<<(arg)
     #puts arg if / INFO / !~ arg
   end
 
-  def with_http(log_tester=lambda {|log| assert_equal([], log) })
-    log = []
-    logger = WEBrick::Log.new(log, WEBrick::BasicLog::WARN)
-    Dir.mktmpdir {|dr|
-      srv = WEBrick::HTTPServer.new({
-        :DocumentRoot => dr,
-        :ServerType => Thread,
-        :Logger => logger,
-        :AccessLog => [[NullLog, ""]],
-        :BindAddress => '127.0.0.1',
-        :Port => 0})
-      _, port, _, host = srv.listeners[0].addr
-      server_thread = srv.start
-      server_thread2 = Thread.new {
-        server_thread.join
-        if log_tester
-          log_tester.call(log)
-        end
-      }
-      client_thread = Thread.new {
-        begin
-          yield srv, "http://#{host}:#{port}", server_thread, log
-        ensure
-          srv.shutdown
-        end
-      }
-      assert_join_threads([client_thread, server_thread2])
-    }
-  ensure
-    WEBrick::Utils::TimeoutHandler.terminate
-  end
-
   def with_env(h)
     begin
       old = {}
diff --git a/test/open-uri/utils.rb b/test/open-uri/utils.rb
new file mode 100644
index 0000000000..53bbc0afc3
--- /dev/null
+++ b/test/open-uri/utils.rb
@@ -0,0 +1,177 @@
+require 'socket'
+require 'base64'
+
+class SimpleHTTPServer
+  def initialize(bind_addr, port, log)
+    @server = TCPServer.new(bind_addr, port)
+    @log = log
+    @procs = {}
+  end
+
+  def mount_proc(path, proc)
+    @procs[path] = proc
+  end
+
+  def start
+    @thread = Thread.new do
+      loop do
+        client = @server.accept
+        handle_request(client)
+        client.close
+      end
+    end
+  end
+
+  def shutdown
+    @thread.kill
+    @server.close
+  end
+
+  private
+
+  def handle_request(client)
+    request_line = client.gets
+    return if request_line.nil?
+
+    method, path, _ = request_line.split
+    headers = {}
+    while (line = client.gets) && line != "\r\n"
+      key, value = line.split(": ", 2)
+      headers[key.downcase] = value.strip
+    end
+
+    if @procs.key?(path) || @procs.key?("#{path}/")
+      proc = @procs[path] || @procs["#{path}/"]
+      req = Request.new(method, path, headers)
+      res = Response.new(client)
+      proc.call(req, res)
+      res.finish
+    else
+      @log << "ERROR `#{path}' not found"
+      client.print "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n"
+    end
+  rescue ::TestOpenURI::Unauthorized => e
+    @log << "ERROR Unauthorized"
+    client.print "HTTP/1.1 401 Unauthorized\r\nContent-Length: 0\r\n\r\n"
+  end
+
+  class Request
+    attr_reader :method, :path, :headers
+    def initialize(method, path, headers)
+      @method = method
+      @path = path
+      @headers = headers
+      parse_basic_auth
+    end
+
+    def [](key)
+      @headers[key.downcase]
+    end
+
+    def []=(key, value)
+      @headers[key.downcase] = value
+    end
+
+    private
+
+    def parse_basic_auth
+      auth = @headers['Authorization']
+      return unless auth && auth.start_with?('Basic ')
+
+      encoded_credentials = auth.split(' ', 2).last
+      decoded_credentials = Base64.decode64(encoded_credentials)
+      @username, @password = decoded_credentials.split(':', 2)
+    end
+  end
+
+  class Response
+    attr_accessor :body, :headers, :status, :chunked, :cookies
+    def initialize(client)
+      @client = client
+      @body = ""
+      @headers = {}
+      @status = 200
+      @chunked = false
+      @cookies = []
+    end
+
+    def [](key)
+      @headers[key.downcase]
+    end
+
+    def []=(key, value)
+      @headers[key.downcase] = value
+    end
+
+    def write_chunk(chunk)
+      return unless @chunked
+      @client.write("#{chunk.bytesize.to_s(16)}\r\n")
+      @client.write("#{chunk}\r\n")
+    end
+
+    def finish
+      @client.write build_response_headers
+      if @chunked
+        write_chunk(@body)
+        @client.write "0\r\n\r\n"
+      else
+        @client.write @body
+      end
+    end
+
+    private
+
+    def build_response_headers
+      response = "HTTP/1.1 #{@status} #{status_message(@status)}\r\n"
+      if @chunked
+        @headers['Transfer-Encoding'] = 'chunked'
+      else
+        @headers['Content-Length'] = @body.bytesize.to_s
+      end
+      @headers.each do |key, value|
+        response << "#{key}: #{value}\r\n"
+      end
+      @cookies.each do |cookie|
+        response << "Set-Cookie: #{cookie}\r\n"
+      end
+      response << "\r\n"
+      response
+    end
+
+    def status_message(code)
+      case code
+      when 200 then 'OK'
+      when 301 then 'Moved Permanently'
+      else 'Unknown'
+      end
+    end
+  end
+end
+
+module TestOpenURIUtils
+  class Unauthorized < StandardError; end
+
+  def with_http(log_tester=lambda {|log| assert_equal([], log) })
+    log = []
+    srv = SimpleHTTPServer.new('localhost', 0, log)
+
+    server_thread = srv.start
+    server_thread2 = Thread.new {
+      server_thread.join
+      if log_tester
+        log_tester.call(log)
+      end
+    }
+
+    port = srv.instance_variable_get(:@server).addr[1]
+
+    client_thread = Thread.new {
+      begin
+        yield srv, "http://localhost:#{port}", server_thread, log
+      ensure
+        srv.shutdown
+      end
+    }
+    assert_join_threads([client_thread, server_thread2])
+  end
+end
\ No newline at end of file