Request method is not being preserved on 307 and 308 redirects

[jpb]

Tested on master:

➜  httparty git:(master) cat redirect.rb
require 'sinatra'

post '/redirect-307' do
  redirect '/target', 307
end

post '/target' do
  'Target'
end

➜  httparty git:(master) ruby -Ilib -rhttparty -e 'HTTParty.post "http://localhost:4567/redirect-307"'

➜  httparty git:(master) ruby redirect.rb
Puma 2.11.3 starting...
* Min threads: 0, max threads: 16
* Environment: development
* Listening on tcp://localhost:4567
== Sinatra/1.4.5 has taken the stage on 4567 for development with backup from Puma
127.0.0.1 - - [16/Sep/2015:14:22:02 -0700] "POST /redirect-307 HTTP/1.1" 307 - 0.0048
127.0.0.1 - - [16/Sep/2015:14:22:02 -0700] "GET /target HTTP/1.1" 404 443 0.0017
^C== Sinatra has ended his set (crowd applauds)

Net:HTTTP status codes should always be handled as strings. Net::HTTPReponse#new will pass through whatever you give it as the code, although a real Net::HTTPResponse status code is always a string.

http://docs.ruby-lang.org/en/2.0.0/Net/HTTPResponse.html#attribute-i-code.

On this branch:

➜  httparty git:(307-308-redirect-status-codes) ruby redirect.rbPuma 2.11.3 starting...
* Min threads: 0, max threads: 16
* Environment: development
* Listening on tcp://localhost:4567
== Sinatra/1.4.5 has taken the stage on 4567 for development with backup from Puma
127.0.0.1 - - [16/Sep/2015:14:24:36 -0700] "POST /redirect-307 HTTP/1.1" 307 - 0.0037
127.0.0.1 - - [16/Sep/2015:14:24:36 -0700] "POST /target HTTP/1.1" 200 6 0.0013
^C== Sinatra has ended his set (crowd applauds)

➜  httparty git:(307-308-redirect-status-codes) ruby -Ilib -rhttparty -e 'HTTParty.post "http://localhost:4567/redirect-307"'