The legacy.html suffix suggests a static, possibly offline version of that portal, intended for older iOS versions (e.g., iOS 9–12) or archived for preservation.

It looks like you’re referencing a file named Jailbreak.app.legacy.html — possibly a local HTML file or a historical reference to a jailbreak tool or website for older iOS versions.

If the ---- Jailbreak.app.legacy.html file is broken, you can create your own legacy installer page: