channels are resettable (meaning, they transition to closed right away), which is important for when there is an error (like timeout or network)

lib/httpx/channel.rb

@@ -112,6 +112,12 @@ module HTTPX
       end
     end
 
+    def reset
+      transition(:closing)
+      transition(:closed)
+      emit(:close)
+    end
+
     def send(request, **args)
       if @parser && !@write_buffer.full?
         parser.send(request, **args)
@@ -139,7 +145,7 @@ module HTTPX
     end
 
     def upgrade_parser(protocol)
-      @parser.close if @parser
+      @parser.reset if @parser
       @parser = build_parser(protocol)
     end
 

lib/httpx/client.rb

@@ -108,6 +108,7 @@ module HTTPX
           break if requests.empty?
         rescue TimeoutError => e
           responses << ErrorResponse.new(e.message, 0) while requests.shift
+          @connection.reset
           break
         end
       end

lib/httpx/connection.rb

@@ -34,6 +34,10 @@ module HTTPX
       end
     end
 
+    def reset
+      @channels.each(&:reset)
+    end
+
     def build_channel(uri, **options)
       channel = Channel.by(uri, @options.merge(options))
       register_channel(channel)