From b1551156dc71208bd8d30dafe7d86aea57401f20 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Sat, 12 Oct 2024 11:47:16 +1300
Subject: [PATCH] If the user reads exactly the content length, rack expects
 the input to be closed.

---
 lib/protocol/rack/input.rb  | 7 +++++++
 test/protocol/rack/input.rb | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/lib/protocol/rack/input.rb b/lib/protocol/rack/input.rb
index 46a527f..3613fdf 100644
--- a/lib/protocol/rack/input.rb
+++ b/lib/protocol/rack/input.rb
@@ -89,6 +89,13 @@ def read_next
 				if @body
 					# User's may forget to call #close...
 					if chunk = @body.read
+						# If the user reads exactly the content length, we close the stream automatically:
+						# https://github.com/socketry/async-http/issues/183
+						if @body.empty?
+							@body.close
+							@body = nil
+						end
+						
 						return chunk
 					else
 						# So if we are at the end of the stream, we close it automatically:
diff --git a/test/protocol/rack/input.rb b/test/protocol/rack/input.rb
index f1cc3a5..159f016 100644
--- a/test/protocol/rack/input.rb
+++ b/test/protocol/rack/input.rb
@@ -52,6 +52,12 @@
 				expect(input.body).to be_nil
 			end
 			
+			it "can read exactly the content length" do
+				expect(body).to receive(:close)
+				
+				expect(input.read(sample_data.join.bytesize)).to be == sample_data.join
+			end
+			
 			it "can read no input" do
 				expect(input.read(0)).to be == ""
 			end