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* [PATCH] deflater: remove "deflate" encoding support
@ 2016-07-27  2:10 Eric Wong
  2016-07-27  2:44 ` James Tucker
  0 siblings, 1 reply; 6+ messages in thread
From: Eric Wong @ 2016-07-27  2:10 UTC (permalink / raw)
  To: rack-devel

This will improve cache hit rates and reduce caching overhead at
small expense of increased header overhead for some user agents.
For reference, Varnish cache supports only gzip as well:

	https://www.varnish-cache.org/docs/4.1/phk/gzip.html

In the past, "deflate" encoding was more likely to trigger
user-agent bugs, as noted in the comments removed with this
change as well as the Varnish documentation referenced above.
---
  The following changes since commit 25a549883b85fb33970b4a1530a365c0c9e51f95:

    bumping to 2.0.1 to work around Rack (2016-06-30 10:33:09 -0700)

  are available in the git repository at:

    git://80x24.org/rack.git no-deflate

  for you to fetch changes up to d6380043a8953dca63743c947c8027f465d29a5d:

    deflater: remove "deflate" encoding support (2016-07-26 23:14:55 +0000)

  ----------------------------------------------------------------
  Eric Wong (1):
        deflater: remove "deflate" encoding support

 lib/rack/deflater.rb  | 37 +------------------------------------
 test/spec_deflater.rb | 38 ++++++++++++++++++++++++--------------
 2 files changed, 25 insertions(+), 50 deletions(-)

diff --git a/lib/rack/deflater.rb b/lib/rack/deflater.rb
index 62a1124..79e39f5 100644
--- a/lib/rack/deflater.rb
+++ b/lib/rack/deflater.rb
@@ -8,7 +8,6 @@ module Rack
   # Currently supported compression algorithms:
   #
   #   * gzip
-  #   * deflate
   #   * identity (no transformation)
   #
   # The middleware automatically detects when compression is supported
@@ -41,7 +40,7 @@ module Rack
 
       request = Request.new(env)
 
-      encoding = Utils.select_best_encoding(%w(gzip deflate identity),
+      encoding = Utils.select_best_encoding(%w(gzip identity),
                                             request.accept_encoding)
 
       # Set the Vary HTTP header.
@@ -57,10 +56,6 @@ module Rack
         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
@@ -101,36 +96,6 @@ module Rack
       end
     end
 
-    class DeflateStream
-      DEFLATE_ARGS = [
-        Zlib::DEFAULT_COMPRESSION,
-        # drop the zlib header which causes both Safari and IE to choke
-        -Zlib::MAX_WBITS,
-        Zlib::DEF_MEM_LEVEL,
-        Zlib::DEFAULT_STRATEGY
-      ]
-
-      def initialize(body)
-        @body = body
-        @closed = false
-      end
-
-      def each
-        deflator = ::Zlib::Deflate.new(*DEFLATE_ARGS)
-        @body.each { |part| yield deflator.deflate(part, Zlib::SYNC_FLUSH) }
-        yield fin = deflator.finish
-      ensure
-        deflator.finish unless fin
-        deflator.close
-      end
-
-      def close
-        return if @closed
-        @closed = true
-        @body.close if @body.respond_to?(:close)
-      end
-    end
-
     private
 
     def should_deflate?(env, status, headers, body)
diff --git a/test/spec_deflater.rb b/test/spec_deflater.rb
index ba7ec5d..0f27c85 100644
--- a/test/spec_deflater.rb
+++ b/test/spec_deflater.rb
@@ -81,13 +81,22 @@ describe Rack::Deflater do
     yield(status, headers, body) if block_given?
   end
 
+  # automatic gzip detection (streamable)
+  def auto_inflater
+    Zlib::Inflate.new(32 + Zlib::MAX_WBITS)
+  end
+
+  def deflate_or_gzip
+    {'deflate, gzip' => 'gzip'}
+  end
+
   it 'be able to deflate bodies that respond to each' do
     app_body = Object.new
     class << app_body; def each; yield('foo'); yield('bar'); end; end
 
-    verify(200, 'foobar', 'deflate', { 'app_body' => app_body }) do |status, headers, body|
+    verify(200, 'foobar', deflate_or_gzip, { 'app_body' => app_body }) do |status, headers, body|
       headers.must_equal({
-        'Content-Encoding' => 'deflate',
+        'Content-Encoding' => 'gzip',
         'Vary' => 'Accept-Encoding',
         'Content-Type' => 'text/plain'
       })
@@ -98,15 +107,15 @@ describe Rack::Deflater do
     app_body = Object.new
     class << app_body; def each; yield('foo'); yield('bar'); end; end
 
-    verify(200, app_body, 'deflate', { 'skip_body_verify' => true }) do |status, headers, body|
+    verify(200, app_body, deflate_or_gzip, { 'skip_body_verify' => true }) do |status, headers, body|
       headers.must_equal({
-        'Content-Encoding' => 'deflate',
+        'Content-Encoding' => 'gzip',
         'Vary' => 'Accept-Encoding',
         'Content-Type' => 'text/plain'
       })
 
       buf = []
-      inflater = Zlib::Inflate.new(-Zlib::MAX_WBITS)
+      inflater = auto_inflater
       body.each { |part| buf << inflater.inflate(part) }
       buf << inflater.finish
 
@@ -118,32 +127,33 @@ describe Rack::Deflater do
     app_body = Object.new
     class << app_body; def each; yield('foo'); yield('bar'); end; end
     opts = { 'skip_body_verify' => true }
-    verify(200, app_body, 'deflate', opts) do |status, headers, body|
+    verify(200, app_body, 'gzip', opts) do |status, headers, body|
       headers.must_equal({
-        'Content-Encoding' => 'deflate',
+        'Content-Encoding' => 'gzip',
         'Vary' => 'Accept-Encoding',
         'Content-Type' => 'text/plain'
       })
 
       buf = []
-      inflater = Zlib::Inflate.new(-Zlib::MAX_WBITS)
+      inflater = auto_inflater
       FakeDisconnect = Class.new(RuntimeError)
       assert_raises(FakeDisconnect, "not Zlib::DataError not raised") do
         body.each do |part|
-          buf << inflater.inflate(part)
+          tmp = inflater.inflate(part)
+          buf << tmp if tmp.bytesize > 0
           raise FakeDisconnect
         end
       end
-      assert_raises(Zlib::BufError) { inflater.finish }
+      inflater.finish
       buf.must_equal(%w(foo))
     end
   end
 
   # TODO: This is really just a special case of the above...
   it 'be able to deflate String bodies' do
-    verify(200, 'Hello world!', 'deflate') do |status, headers, body|
+    verify(200, 'Hello world!', deflate_or_gzip) do |status, headers, body|
       headers.must_equal({
-        'Content-Encoding' => 'deflate',
+        'Content-Encoding' => 'gzip',
         'Vary' => 'Accept-Encoding',
         'Content-Type' => 'text/plain'
       })
@@ -280,7 +290,7 @@ describe Rack::Deflater do
         'Content-Encoding' => 'identity'
       }
     }
-    verify(200, 'Hello World!', 'deflate', options)
+    verify(200, 'Hello World!', deflate_or_gzip, options)
   end
 
   it "deflate if content-type matches :include" do
@@ -334,7 +344,7 @@ describe Rack::Deflater do
         :if => lambda { |env, status, headers, body| true }
       }
     }
-    verify(200, 'Hello World!', 'deflate', options)
+    verify(200, 'Hello World!', deflate_or_gzip, options)
   end
 
   it "not deflate if :if lambda evaluates to false" do
-- 
EW

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^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-04-23  8:27 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-07-27  2:10 [PATCH] deflater: remove "deflate" encoding support Eric Wong
2016-07-27  2:44 ` James Tucker
2016-07-27  6:40   ` Eric Wong
2016-07-27  8:46     ` Eric Wong
2016-08-23 19:40       ` James Tucker
2019-04-21 19:51   ` Vy Nguyen

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