From 2c4d1c01d6780e7cb1a9e6ac093b3bf8fb04e4df Mon Sep 17 00:00:00 2001
From: Reed Emmons <reed.emmons@gmail.com>
Date: Mon, 22 Jun 2026 16:50:29 -0400
Subject: [PATCH] ENG-4325: Guard nil rack.input for Rack 3 compatibility

---
 lib/rspec_api_documentation/client_base.rb | 2 ++
 lib/rspec_api_documentation/test_server.rb | 4 ++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/rspec_api_documentation/client_base.rb b/lib/rspec_api_documentation/client_base.rb
index db0560a3..dec5b49d 100644
--- a/lib/rspec_api_documentation/client_base.rb
+++ b/lib/rspec_api_documentation/client_base.rb
@@ -45,6 +45,8 @@ def process(method, path, params = {}, headers ={})
 
     def read_request_body
       input = last_request.env["rack.input"]
+      return "" if input.nil?
+
       input.rewind
       input.read
     end
diff --git a/lib/rspec_api_documentation/test_server.rb b/lib/rspec_api_documentation/test_server.rb
index 9a89ba0b..1074265e 100644
--- a/lib/rspec_api_documentation/test_server.rb
+++ b/lib/rspec_api_documentation/test_server.rb
@@ -8,11 +8,11 @@ class TestServer < Struct.new(:example)
 
     def call(env)
       input = env["rack.input"]
-      input.rewind
+      input.rewind unless input.nil?
 
       @request_method = env["REQUEST_METHOD"]
       @request_headers = env_to_headers(env)
-      @request_body = input.read
+      @request_body = input.nil? ? "" : input.read
 
       request_metadata = {}