class Protocol::HTTP::ContentEncoding

Encode a response according the the request's acceptable encodings.

Constants

DEFAULT_CONTENT_TYPES
DEFAULT_WRAPPERS

Public Class Methods

new(app, content_types = DEFAULT_CONTENT_TYPES, wrappers = DEFAULT_WRAPPERS) click to toggle source
Calls superclass method
# File lib/protocol/http/content_encoding.rb, line 38
def initialize(app, content_types = DEFAULT_CONTENT_TYPES, wrappers = DEFAULT_WRAPPERS)
        super(app)
        
        @content_types = content_types
        @wrappers = wrappers
end

Public Instance Methods

call(request) click to toggle source
Calls superclass method
# File lib/protocol/http/content_encoding.rb, line 45
def call(request)
        response = super
        
        # Early exit if the response has already specified a content-encoding.
        return response if response.headers['content-encoding']
        
        # This is a very tricky issue, so we avoid it entirely.
        # https://lists.w3.org/Archives/Public/ietf-http-wg/2014JanMar/1179.html
        return response if response.partial?
        
        # Ensure that caches are aware we are varying the response based on the accept-encoding request header:
        response.headers.add('vary', 'accept-encoding')
        
        # TODO use http-accept and sort by priority
        if !response.body.empty? and accept_encoding = request.headers['accept-encoding']
                
                if content_type = response.headers['content-type'] and @content_types =~ content_type
                        body = response.body
                        
                        accept_encoding.each do |name|
                                if wrapper = @wrappers[name]
                                        response.headers['content-encoding'] = name
                                        
                                        body = wrapper.call(body)
                                        
                                        break
                                end
                        end
                        
                        response.body = body
                end
        end
        
        return response
end