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| | 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 ], keepalive)
#
# Most header correctness (including Content-Length and Content-Type)
# is the job of Rack, with the exception of the "Connection"
# and "Date" headers.
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
}
CONN_CLOSE = "Connection: close\r\n"
CONN_ALIVE = "Connection: keep-alive\r\n"
# 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 }.freeze
# writes the rack_response to socket as an HTTP response
def self.write(socket, rack_response, keepalive = false)
status, headers, body = rack_response
status = CODES[status.to_i] || status
tmp = [ keepalive ? CONN_ALIVE : CONN_CLOSE ]
# 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| tmp << "#{key}: #{v}\r\n" }
else
tmp << "#{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" \
"#{tmp.join(Z)}\r\n")
body.each { |chunk| socket.write(chunk) }
keepalive or socket.close # flushes and uncorks the socket immediately
ensure
body.respond_to?(:close) and body.close rescue nil
end
end
end
|