handle case where request body is a Rack::Lint::InputWrapper

Author: brianewing

lib/rack/reverse_proxy.rb

@@ -44,7 +44,15 @@ def call(env)
         when "PUT", "POST"
           req = Net::HTTP.const_get(m.capitalize).new(uri.request_uri, headers)
           req.basic_auth all_opts[:username], all_opts[:password] if all_opts[:username] and all_opts[:password]
-          req.content_length = rackreq.body.size
+
+          if rackreq.body.respond_to?(:read) && rackreq.body.respond_to?(:rewind)
+            body = rackreq.body.read
+            req.content_length = body.size
+            rackreq.body.rewind
+          else
+            req.content_length = rackreq.body.size
+          end
+          
           req.body_stream = rackreq.body
         else
           raise "method not supported: #{m}"