XMLHttpRequest corrupts headers named after Object prototype properties

Description

React Native XMLHttpRequest stores request headers and normalized response headers in ordinary objects. Valid header names that collide with Object.prototype are therefore corrupted or hidden: repeated Constructor values begin with inherited function text, __proto__ cannot be stored normally, and an absent toString response header is returned as an inherited function instead of null.

Expected behavior

All valid case-insensitive header names should be stored, combined, and retrieved as their own values without interacting with JavaScript object prototypes.

React Native Version

0.87.1 and current main

Affected Platforms

JavaScript networking - All

React Native の XMLHttpRequest 実装から始め、リクエストヘッダーと正規化されたレスポンスヘッダーがどのように保存・取得されるかを確認します。Constructor、proto、および存在しない toString ヘッダーに対する焦点を絞ったテストを見つけるか追加します。大文字と小文字を区別しない有効な名前が Object.prototype と相互作用せずに独自の値を保持すれば完了です。