HTTP 100 continue with wget

server.rb

require "socket"

server = TCPServer.new("0.0.0.0", 9999)
count = 0

loop do
  count = count + 1
  client = server.accept
  req = client.readline
  client.readline
  if count > 3
    client.puts "HTTP/1.1 200 OK"
    client.puts "Content-Type: text/plain"
    client.puts "Content-Length: 10"
    client.puts "Connection: close"
    client.puts
    client.puts "1234567890"
    count = 0
  else
    client.puts "HTTP/1.1 100 CONTINUE"
    client.puts "Content-Type: text/plain"
    client.puts "Content-Length: 0"
    client.puts "Connection: close"
    client.puts
  end
  client.close_write
end

Combining this with wget localhost:9999 will cause wget to keep trying until it receives a response.

Change 100 CONTINUE to 202 CREATED and it won't.

Cool. What's the use-case here? Why can't you just hold onto the connection?

BTW: 100 Continue will never have a body, so it should work without Content-Length.

The use case was that an app responded to an expensive request (generate a git tarball} by putting a message on a queue and returning an empty 202 response. Wget would consider this empty response a success. Http 100 would make it retry.