fetch response.text() returning undefined on iOS works on Android

Description

reading textual information from a http (not https!) fetch response is not possible on iOS. It always returns undefined.

I have added the required ATS excemptions in my iOS app like this:

<key>streamingsoundtracks.com</key>
<dict>
	<key>NSExceptionAllowsInsecureHTTPLoads</key>
	<true/>
	<key>NSIncludesSubdomains</key>
	<true/>
</dict>

React Native Version

0.71.7

Output of npx react-native info

System:
OS: macOS 13.3.1
CPU: (10) arm64 Apple M1 Max
Memory: 42.66 MB / 64.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 16.18.1 - ~/.nvm/versions/node/v16.18.1/bin/node
Yarn: 1.22.19 - ~/.yarn/bin/yarn
npm: 8.19.2 - ~/.nvm/versions/node/v16.18.1/bin/npm
Watchman: 2022.09.26.00 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.11.3 - /Users/pkursawe/.gem/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 22.2, iOS 16.2, macOS 13.1, tvOS 16.1, watchOS 9.1
Android SDK:
API Levels: 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33
Build Tools: 28.0.3, 29.0.2, 29.0.3, 30.0.0, 30.0.1, 30.0.2, 30.0.3, 31.0.0, 33.0.0
System Images: android-22 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom, android-24 | Google APIs Intel x86 Atom, android-25 | Google APIs Intel x86 Atom, android-26 | Google APIs Intel x86 Atom, android-27 | Google APIs Intel x86 Atom, android-28 | Google ARM64-V8a Play ARM 64 v8a, android-29 | Google APIs Intel x86 Atom, android-29 | Google Play ARM 64 v8a, android-29 | Google Play Intel x86 Atom, android-30 | Google APIs Intel x86 Atom, android-30 | Google Play ARM 64 v8a, android-31 | Google Play ARM 64 v8a, android-32 | Google Play ARM 64 v8a
Android NDK: Not Found
IDEs:
Android Studio: 2021.2 AI-212.5712.43.2112.8512546
Xcode: 14.2/14C18 - /usr/bin/xcodebuild
Languages:
Java: javac 18 - /usr/local/opt/openjdk/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: Not Found
react-native: Not Found
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps to reproduce

fetch( "http://streamingsoundtracks.com/modules/ClearChat/common/log.php")
  .then(response => response.text())

Snack, code example, screenshot, or link to a repository

https://snack.expo.dev/bgysLbFYW

リンクされている Snack から始め、指定された HTTP URL に対する fetch 呼び出しを iOS と Android で再現し、response と response.text() の挙動を比較します。React Native の iOS 向け fetch 実装とレスポンスボディの処理を追跡します。iOS の呼び出しが undefined ではなくテキストレスポンスを返し、Android の挙動が維持されれば完了です。