Class: Rack::Deflater
- Inherits:
-
Object
- Object
- Rack::Deflater
- Defined in:
- rack/rack/deflater.rb
Overview
This middleware enables compression of http responses.
Currently supported compression algorithms:
-
gzip
-
deflate
-
identity (no transformation)
The middleware automatically detects when compression is supported and allowed. For example no transformation is made when a cache directive of 'no-transform' is present, or when the response status code is one that doesn't allow an entity body.
Defined Under Namespace
Classes: DeflateStream, GzipStream
Instance Method Summary (collapse)
- - (void) call(env)
-
- (Deflater) initialize(app)
constructor
A new instance of Deflater.
Constructor Details
- (Deflater) initialize(app)
Returns a new instance of Deflater
20 21 22 |
# File 'rack/rack/deflater.rb', line 20 def initialize(app) @app = app end |
Instance Method Details
- (void) call(env)
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 |
# File 'rack/rack/deflater.rb', line 24 def call(env) status, headers, body = @app.call(env) headers = Utils::HeaderHash.new(headers) # Skip compressing empty entity body responses and responses with # no-transform set. if Utils::STATUS_WITH_NO_ENTITY_BODY.include?(status) || headers['Cache-Control'].to_s =~ /\bno-transform\b/ || (headers['Content-Encoding'] && headers['Content-Encoding'] !~ /\bidentity\b/) return [status, headers, body] end request = Request.new(env) encoding = Utils.select_best_encoding(%w(gzip deflate identity), request.accept_encoding) # Set the Vary HTTP header. vary = headers["Vary"].to_s.split(",").map { |v| v.strip } unless vary.include?("*") || vary.include?("Accept-Encoding") headers["Vary"] = vary.push("Accept-Encoding").join(",") end case encoding when "gzip" headers['Content-Encoding'] = "gzip" headers.delete('Content-Length') mtime = headers.key?("Last-Modified") ? Time.httpdate(headers["Last-Modified"]) : Time.now [status, headers, GzipStream.new(body, mtime)] when "deflate" headers['Content-Encoding'] = "deflate" headers.delete('Content-Length') [status, headers, DeflateStream.new(body)] when "identity" [status, headers, body] when nil body.close if body.respond_to?(:close) = "An acceptable encoding for the requested resource #{request.fullpath} could not be found." [406, {"Content-Type" => "text/plain", "Content-Length" => .length.to_s}, []] end end |