Question

Has anyone tried streaming html/text/content from webrick? I’ve tried assigning an IO to the response body, but webrick is waiting for the stream to be closed first.

Answer 1

found this link by accident (http://redmine.ruby-lang.org/attachments/download/161) which contains webrick patch

# Copyright (C) 2008 Brian Candler, released under Ruby Licence. # # A collection of small monkey-patches to webrick.  require 'webrick'  module WEBrick    class HTTPRequest     # Generate HTTP/1.1 100 continue response. See     # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/18459     def continue       if self['expect'] == '100-continue' && @config[:HTTPVersion] >= '1.1'         @socket.write 'HTTP/#{@config[:HTTPVersion]} 100 continue\r\n\r\n'         @header.delete('expect')       end     end   end    class HTTPResponse     alias :orig_setup_header :setup_header     # Correct termination of streamed HTTP/1.1 responses. See     # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/18454 and     # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/18565     def setup_header       orig_setup_header       unless chunked? || @header['content-length']         @header['connection'] = 'close'         @keep_alive = false       end     end      # Allow streaming of zipfile entry. See     # http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/18460     def send_body(socket)       if @body.respond_to?(:read) then send_body_io(socket)       elsif @body.respond_to?(:call) then send_body_proc(socket)       else send_body_string(socket)       end     end      # If the response body is a proc, then we invoke it and pass in     # an object which supports 'write' and '<<' methods. This allows     # arbitary output streaming.     def send_body_proc(socket)       if @request_method == 'HEAD'         # do nothing       elsif chunked?         @body.call(ChunkedWrapper.new(socket, self))         _write_data(socket, '0#{CRLF}#{CRLF}')       else         size = @header['content-length'].to_i         @body.call(socket)   # TODO: StreamWrapper which supports offset, size         @sent_size = size       end     end      class ChunkedWrapper       def initialize(socket, resp)         @socket = socket         @resp = resp       end       def write(buf)         return if buf.empty?         data = ''         data << format('%x', buf.size) << CRLF         data << buf << CRLF         socket = @socket         @resp.instance_eval {           _write_data(socket, data)           @sent_size += buf.size         }       end       alias :<< :write     end   end end  if RUBY_VERSION < '1.9'   old_verbose, $VERBOSE = $VERBOSE, nil   # Increase from default of 4K for efficiency, similar to   # http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/ruby_1_8/lib/net/protocol.rb?r1=11708&r2=12092   # In trunk the default is 64K and can be adjusted using :InputBufferSize,   # :OutputBufferSize   WEBrick::HTTPRequest::BUFSIZE = 16384   WEBrick::HTTPResponse::BUFSIZE = 16384   $VERBOSE = old_verbose end 

to use simply pass a proc to as the response body, like so

res.body = proc { |w|   10.times do     w << Time.now.to_s     sleep(1)   end } 

woot!