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| | # -*- encoding: binary -*-
require 'time'
module Unicorn
# Writes a Rack response to your client using the HTTP/1.1 specification.
# You use it by simply doing:
#
# status, headers, body = rack_app.call(env)
# HttpResponse.write(socket, [ status, headers, body ])
#
# Most header correctness (including Content-Length and Content-Type)
# is the job of Rack, with the exception of the "Connection: close"
# and "Date" headers.
#
# A design decision was made to force the client to not pipeline or
# keepalive requests. HTTP/1.1 pipelining really kills the
# performance due to how it has to be handled and how unclear the
# standard is. To fix this the HttpResponse always gives a
# "Connection: close" header which forces the client to close right
# away. The bonus for this is that it gives a pretty nice speed boost
# to most clients since they can close their connection immediately.
class HttpResponse
# Every standard HTTP code mapped to the appropriate message.
CODES = Rack::Utils::HTTP_STATUS_CODES.inject({}) { |hash,(code,msg)|
hash[code] = "#{code} #{msg}"
hash
}
# Rack does not set/require a Date: header. We always override the
# Connection: and Date: headers no matter what (if anything) our
# Rack application sent us.
SKIP = { 'connection' => true, 'date' => true, 'status' => true }
OUT = [] # :nodoc
def self.write_header(socket, status, headers)
status = CODES[status.to_i] || status
OUT.clear
# Don't bother enforcing duplicate supression, it's a Hash most of
# the time anyways so just hope our app knows what it's doing
headers.each do |key, value|
next if SKIP.include?(key.downcase)
if value =~ /\n/
value.split(/\n/).each { |v| OUT << "#{key}: #{v}\r\n" }
else
OUT << "#{key}: #{value}\r\n"
end
end
# Rack should enforce Content-Length or chunked transfer encoding,
# so don't worry or care about them.
# Date is required by HTTP/1.1 as long as our clock can be trusted.
# Some broken clients require a "Status" header so we accomodate them
socket.write("HTTP/1.1 #{status}\r\n" \
"Date: #{Time.now.httpdate}\r\n" \
"Status: #{status}\r\n" \
"Connection: close\r\n" \
"#{OUT.join(Z)}\r\n")
end
# writes the rack_response to socket as an HTTP response
def self.write(socket, rack_response, have_header = true)
status, headers, body = rack_response
write_header(socket, status, headers) if have_header
body.each { |chunk| socket.write(chunk) }
socket.close # flushes and uncorks the socket immediately
ensure
body.respond_to?(:close) and body.close
end
end
end
|