class Rack::Response

Your application’s call should end returning Response#finish.
write are synchronous with the Rack response.
finish. finish however can take a block inside which calls to
but note that this is buffered by Rack::Response until you call
You can use Response#write to iteratively generate your response,
defaults (an OK response with empty headers and body).
It allows setting of headers and cookies, and provides useful
response.
Rack::Response provides a convenient interface to create a Rack

def self.[](status, headers, body) 

def self.[](status, headers, body)
  self.new(body, status, headers)
end

def chunked? 

def chunked?
  CHUNKED == get_header(TRANSFER_ENCODING)
end

def close 

def close
  @body.close if @body.respond_to?(:close)
end

def delete_header(key); headers.delete key; end 

def delete_header(key); headers.delete key; end

def each(&callback) 

def each(&callback)
  @body.each(&callback)
  @buffered = true
  if @block
    @writer = callback
    @block.call(self)
  end
end

def empty? 

def empty?
  @block == nil && @body.empty?
end

def finish(&block)

Returns:
  • (Array) - a 3-tuple suitable of `[status, headers, body]` 
def finish(&block)
  if STATUS_WITH_NO_ENTITY_BODY[status.to_i]
    delete_header CONTENT_TYPE
    delete_header CONTENT_LENGTH
    close
    return [@status, @headers, []]
  else
    if block_given?
      @block = block
      return [@status, @headers, self]
    else
      return [@status, @headers, @body]
    end
  end
end

def get_header(key); headers[key]; end 

def get_header(key);    headers[key];       end

def has_header?(key); headers.key? key; end 

def has_header?(key);   headers.key? key;   end

def initialize(body = nil, status = 200, headers = {})

Parameters:
  • headers (#each) -- a list of key-value header pairs which
  • status (Integer) -- the integer status as defined by the
  • body (nil, #each, #to_str) -- the response body. 
def initialize(body = nil, status = 200, headers = {})
  @status = status.to_i
  @headers = Utils::HeaderHash[headers]
  @writer = self.method(:append)
  @block = nil
  # Keep track of whether we have expanded the user supplied body.
  if body.nil?
    @body = []
    @buffered = true
    @length = 0
  elsif body.respond_to?(:to_str)
    @body = [body]
    @buffered = true
    @length = body.to_str.bytesize
  else
    @body = body
    @buffered = false
    @length = 0
  end
  yield self if block_given?
end

def redirect(target, status = 302) 

def redirect(target, status = 302)
  self.status = status
  self.location = target
end

def set_header(key, v); headers[key] = v; end 

def set_header(key, v); headers[key] = v;   end

def write(chunk)


NOTE: Do not mix #write and direct #body access!

Append to body and update Content-Length. 
def write(chunk)
  buffered_body!
  @writer.call(chunk.to_s)
end