do not set concurrent requests at the options level, instead define it depending of the protocol

lib/httpx/connection/http1.rb

@@ -7,14 +7,15 @@ module HTTPX
     include Callbacks
     include Loggable
 
+    MAX_REQUESTS = 100
     CRLF = "\r\n"
 
     attr_reader :pending
 
     def initialize(buffer, options)
       @options = Options.new(options)
-      @max_concurrent_requests = @options.max_concurrent_requests
-      @max_requests = @max_concurrent_requests
+      @max_concurrent_requests = @options.max_concurrent_requests || MAX_REQUESTS
+      @max_requests = MAX_REQUESTS
       @parser = Parser::HTTP1.new(self)
       @buffer = buffer
       @version = [1, 1]

lib/httpx/connection/http2.rb

@@ -8,6 +8,8 @@ module HTTPX
     include Callbacks
     include Loggable
 
+    MAX_CONCURRENT_REQUESTS = 200
+
     Error = Class.new(Error) do
       def initialize(id, code)
         super("stream #{id} closed with error: #{code}")

lib/httpx/options.rb

@@ -2,7 +2,6 @@
 
 module HTTPX
   class Options
-    MAX_CONCURRENT_REQUESTS = 100
     WINDOW_SIZE = 1 << 14 # 16K
     MAX_BODY_THRESHOLD_SIZE = (1 << 10) * 112 # 112K
 
@@ -55,7 +54,6 @@ module HTTPX
         :fallback_protocol => "http/1.1",
         :timeout => Timeout.new,
         :headers => {},
-        :max_concurrent_requests => MAX_CONCURRENT_REQUESTS,
         :window_size => WINDOW_SIZE,
         :body_threshold_size => MAX_BODY_THRESHOLD_SIZE,
         :request_class => Class.new(Request),

test/options_test.rb

@@ -69,7 +69,7 @@ class OptionsTest < Minitest::Test
       :http2_settings => { :settings_enable_push => 0 },
       :fallback_protocol => "http/1.1",
       :headers => { "accept" => "xml", "foo" => "foo", "bar" => "bar" },
-      :max_concurrent_requests => 100,
+      :max_concurrent_requests => nil,
       :request_class => bar.request_class,
       :response_class => bar.response_class,
       :headers_class => bar.headers_class,