adding the accept-encoding header with the registered compression methods

lib/httpx/plugins/compression.rb

@@ -3,19 +3,15 @@
 module HTTPX
   module Plugins
     module Compression
-      ACCEPT_ENCODING = %w[gzip deflate].freeze
-
+      extend Registry
       def self.configure(klass, *)
         klass.plugin(:"compression/gzip")
         klass.plugin(:"compression/deflate")
       end
 
-      module RequestMethods
-        def initialize(*)
-          super
-          ACCEPT_ENCODING.each do |enc|
-            @headers.add("accept-encoding", enc)
-          end
+      module InstanceMethods
+        def initialize(opts = {})
+          super(opts.merge(headers: {"accept-encoding" => Compression.registry.keys}))
         end
       end
 
@@ -78,10 +74,7 @@ module HTTPX
           # @buffer.close
         end
       end
-
     end
     register_plugin :compression, Compression
   end
-
-
 end

lib/httpx/plugins/compression/brotli.rb

@@ -12,6 +12,7 @@ module HTTPX
 
         def self.configure(*)
           Transcoder.register "br", BrotliTranscoder
+          Compression.register "br", self 
         end
 
         module ResponseBodyMethods

lib/httpx/plugins/compression/deflate.rb

@@ -4,7 +4,6 @@ module HTTPX
   module Plugins
     module Compression
       module Deflate 
-
         def self.load_dependencies(*)
           require "stringio"
           require "zlib"
@@ -12,6 +11,7 @@ module HTTPX
 
         def self.configure(*)
           Transcoder.register "deflate", DeflateTranscoder
+          Compression.register "deflate", self 
         end
 
         module DeflateTranscoder

lib/httpx/plugins/compression/gzip.rb

@@ -4,13 +4,13 @@ module HTTPX
   module Plugins
     module Compression
       module GZIP
-
         def self.load_dependencies(*)
           require "zlib"
         end
 
         def self.configure(*)
           Transcoder.register "gzip", GZIPTranscoder
+          Compression.register "gzip", self 
         end
 
         module GZIPTranscoder
@@ -57,7 +57,6 @@ module HTTPX
             Zlib::GzipReader.new(io, window_size: 32 + Zlib::MAX_WBITS)
           end
         end
-
       end
     end
     register_plugin :"compression/gzip", Compression::GZIP