Observed arrival · 2026-09-26
THorn HTTP puts network misbehavior on the test bench
A free, open-source browser extension for redirecting requests, changing headers and bodies, mocking API responses, and simulating delays.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Developers testing web apps and API behavior
- Worth noticing
- Rule timers switch overrides off after 15 minutes, 1 hour, 4 hours, or 1 day.
Field notes
The rule tester is unusually diagnostic: it checks case, trailing slashes, query strings, request filters, extension state, and whether a rule or group is disabled. Sharing places rules after the # in a link, which the page says keeps them out of the request sent to the server. Delay coverage differs by browser: the broader set of page resources is described for Chrome and Edge, while Firefox support is limited to fetch/XHR.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue