Ruby Web Server Hanging When Trying To Parse HTTP Request

I am working on an assignment which requires me to implement a web server in Ruby without using any libraries. I have a basic server setup to return a "Hello World" response and I am ready to move onto the next step.

The next step is to generate HTTP Responses based on the HTTP Requests. This is where I am having trouble, it seems that the while loop in my program causes the server to hang.

The code for the web server:

require 'socket'

server = TCPServer.new('localhost', 2345)

http_request = ""

loop do

  socket = server.accept
  request = socket.gets

  while line = socket.gets
    puts line
    http_request << line
  end

  response = "Hello World!\n"

  socket.print "HTTP/1.1 200 OK\r\n" +
               "Content-Type: text/plain\r\n" +
               "Content-Length: #{response.bytesize}\r\n" +
               "Connection: close\r\n"

  socket.print "\r\n"

  socket.print response

  puts "DONE with while loop!"

  socket.close
end

In the code above, I am trying to put the HTTP request into a the string http_request and parse that to determine which HTTP response I want to generate. I have tested my code without the while loop and was able to reach the Hello World page in my browser using localhost:2345/test. However, with the addition of the while loop, I am no longer able to load the page and the string "DONE with while loop!" is never printed into the console.

Does anyone know why my web server is hanging? Am I approaching the problem entirely wrong?