http2: added http2_settings as configurable options; allow parser to be upgraded

lib/httpx/channel.rb

@@ -115,6 +115,11 @@ module HTTPX
       nil
     end
 
+    def upgrade_parser(protocol)
+      @parser.close if @parser
+      @parser = build_parser(protocol)
+    end
+
     private
     
     def connect
@@ -151,12 +156,14 @@ module HTTPX
     end
 
     def parser
-      @parser || begin
-        @parser = registry(@io.protocol).new(@write_buffer, @options)
-        @parser.on(:response, &@on_response)
-        @parser.on(:close) { throw(:close, self) }
-        @parser
-      end
+      @parser ||= build_parser 
+    end
+
+    def build_parser(protocol=@io.protocol)
+      parser = registry(protocol).new(@write_buffer, @options)
+      parser.on(:response, &@on_response)
+      parser.on(:close) { throw(:close, self) }
+      parser
     end
   end
 end

lib/httpx/channel/http2.rb

@@ -202,6 +202,14 @@ module HTTPX
       stream.refuse
       # TODO: policy for handling promises
     end
+
+    def method_missing(meth, *args, &blk)
+      if @connection.respond_to?(meth)
+        @connection.__send__(meth, *args, &blk)
+      else
+        super
+      end
+    end
   end
   Channel.register "h2", Channel::HTTP2
 end

lib/httpx/options.rb

@@ -42,6 +42,7 @@ module HTTPX
         :debug                    => ENV.key?("HTTPX_DEBUG") ? $stderr : nil,
         :debug_level              => (ENV["HTTPX_DEBUG"] || 1).to_i,
         :ssl                      => { alpn_protocols: %w[h2 http/1.1] },
+        :http2_settings           => { settings_enable_push: 0 },
         :fallback_protocol        => "http/1.1", 
         :timeout                  => Timeout.by(:per_operation),
         :headers                  => {},
@@ -84,7 +85,7 @@ module HTTPX
 
     %w[
       params form json body
-      follow ssl max_retries
+      follow ssl http2_settings max_retries
       request_class response_class headers_class response_body_class
       io fallback_protocol debug debug_level
     ].each do |method_name|
@@ -97,9 +98,7 @@ module HTTPX
 
       merged = h1.merge(h2) do |k, v1, v2|
         case k
-        when :headers
-          v1.merge(v2)
-        when :ssl
+        when :headers, :ssl, :http2_settings
           v1.merge(v2)
         else
           v2