diff --git a/lib/net/http.rb b/lib/net/http.rb
index 4738bc6..844ce12 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -1439,7 +1439,7 @@ def transport_request(req)
           begin
             res = HTTPResponse.read_new(@socket)
             res.decode_content = req.decode_content
-          end while res.kind_of?(HTTPContinue)
+          end while res.continue?
 
           res.uri = req.uri
 
diff --git a/lib/net/http/response.rb b/lib/net/http/response.rb
index e2964c4..2cdb777 100644
--- a/lib/net/http/response.rb
+++ b/lib/net/http/response.rb
@@ -120,6 +120,11 @@ def error!   #:nodoc:
     raise error_type().new(@code + ' ' + @message.dump, self)
   end
 
+  # true if another response immediately follows this one
+  def continue?
+    self.class::CONTINUE
+  end
+
   def error_type   #:nodoc:
     self.class::EXCEPTION_TYPE
   end
diff --git a/lib/net/http/responses.rb b/lib/net/http/responses.rb
index 8e75f75..697a8db 100644
--- a/lib/net/http/responses.rb
+++ b/lib/net/http/responses.rb
@@ -2,26 +2,32 @@
 # :stopdoc:
 class Net::HTTPUnknownResponse < Net::HTTPResponse
   HAS_BODY = true
+  CONTINUE = false
   EXCEPTION_TYPE = Net::HTTPError
 end
 class Net::HTTPInformation < Net::HTTPResponse           # 1xx
   HAS_BODY = false
+  CONTINUE = true
   EXCEPTION_TYPE = Net::HTTPError
 end
 class Net::HTTPSuccess < Net::HTTPResponse               # 2xx
   HAS_BODY = true
+  CONTINUE = false
   EXCEPTION_TYPE = Net::HTTPError
 end
 class Net::HTTPRedirection < Net::HTTPResponse           # 3xx
   HAS_BODY = true
+  CONTINUE = false
   EXCEPTION_TYPE = Net::HTTPRetriableError
 end
 class Net::HTTPClientError < Net::HTTPResponse           # 4xx
   HAS_BODY = true
+  CONTINUE = false
   EXCEPTION_TYPE = Net::HTTPServerException   # for backward compatibility
 end
 class Net::HTTPServerError < Net::HTTPResponse           # 5xx
   HAS_BODY = true
+  CONTINUE = false
   EXCEPTION_TYPE = Net::HTTPFatalError    # for backward compatibility
 end
 
@@ -30,6 +36,7 @@ class Net::HTTPContinue < Net::HTTPInformation           # 100
 end
 class Net::HTTPSwitchProtocol < Net::HTTPInformation     # 101
   HAS_BODY = false
+  CONTINUE = false
 end
 # 102 - RFC 2518; removed in RFC 4918