I'm writing this simple CGI handler for an endpoint directly in the webserver using the ruby cgi library. So, I want to respond with 405 when it's not a POST, and 200 otherwise.

# upload.cgi
require 'cgi'

cgi = CGI.new

if cgi.request_method != "POST"
cgi.out("type" => "text/plain",
"connection" => "close",
"status" =>"METHOD_NOT_ALLOWED") { "Method Not Allowed" }

else
cgi.out { "hurray" }
end

# server.rb
server = WEBrick::HTTPServer.new :Port => ENV["PORT"] || 8989
server.mount "/upload", WEBrick::HTTPServlet::CGIHandler , './upload.cgi' trap('INT') { server.stop }
server.start

the server.rb is only to test it locally. I'm using curl to test it. So, when I do:

curl http://localhost:8989/upload -I

HTTP/1.1 405 Method Not Allowed

....

But when I do:

curl -X POST http://localhost:8989/upload -I

=> HTTP/1.1 411 Length Required
....

It was my understanding according to the docs that the length would be filled automatically, and if the cgi handles GET requests, in fact it does. So I assume this is a POST "problem". How can I respond successfully?

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