When /etc/h*sts Breaks Your Substack Editor: An Adventure in Web Content Filtering

The Mysterious Network ErrorI was working on a technical post about DNS resolution when I encountered something unexpected. Every time I typed the path to the hosts file (/etc/h*sts - intentionally obfuscated to avoid triggering the very issue I'm discussing), my Substack editor would display a "Network Error" and fail to autosave my draft. At first, I assumed Substack was experiencing an outage.

[softantenna]

Substackエディターで技術記事を作成中に「/etc/hosts」のパスを入力したところ、「Network Error」が発生し、ドラフトの自動保存が失敗したという事象を詳しく解説。特定のパスをSubstackのAPIがリクエスト拒否するらしい。