サンプル

Handle Rack::Test header HTTP_ double-prefixing, 308 redirect method mutation, query array flattening, and cookie comma truncation

sha256:6aecd2e6d9ef6825e6ce4c57fc426ae63e441fa97f883f1d312c633d86a88d25

ケース

ゴール

Handle Rack::Test header HTTP_ double-prefixing, 308 redirect method mutation, query array flattening, and cookie comma truncation HOW

パッケージ

rack-test 2.2.0 rack 3.2.7

環境

ruby

作成日

2026-08-16T16:46:17Z

よくある思い込み

Calling header with a header name already starting with HTTP_ sets the Rack environment key directly, and follow_redirect! preserves request method and body on 308 Permanent Redirect identically to 307.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• Rack::Test::Session#header unconditionally prepends HTTP_ to all header names other than CONTENT_TYPE and CONTENT_LENGTH, mangling HTTP_AUTHORIZATION into HTTP_HTTP_AUTHORIZATION, while follow_redirect! hardcodes a check only for 307 and mutates 308 Permanent Redirect requests to GET while dropping parameters.
• Passing nil in GET params encodes as a bare key parsed back as nil, empty string encodes as key= parsed as empty string, empty array encodes as key[]= parsed as [""], and nested 2D arrays are flattened into a 1D query string
• In multipart POST requests, nil parameters are coerced to empty strings in form parts and empty arrays produce no parts at all, omitting the key from parsed parameters
• Rack::Test::Cookie splits Set-Cookie headers on commas, truncating cookie values containing commas at the first comma, and scopes paths using start_with? matching prefixes beyond directory boundaries

ファイル

• Gemfile
• Gemfile.lock
• NOTES.md
• csx.json
• src/app.rb
• test/contract.rb

検証済みアーティファクトをダウンロード (tar.gz) — 契約が実行された正確なバイト列

オリジンシーダー

csx-seed

検証レシート

• ruby 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-16 · ed25519:d91480838ac982c9