Bisection answers a precise historical question: within selected history, where does a reproducible observation change from good to bad? It does not identify a root cause merely by naming a commit. The search depends on correct endpoint labels and consistent intermediate decisions. Treat the reported boundary as evidence to inspect, then confirm the behavior on both sides and explain the change that accounts for it. ...
A command-line HTTP request gives a small, inspectable view of a service. It can show the response status, headers, body, and timing without a browser’s rendering layer. Start with a concrete question: whether the original URL redirects correctly, whether the final representation is available, or whether a particular method is accepted. Those questions require different probes. One successful curl invocation does not establish that every part of a website works. ...
Walk a live origin from method to body to cache, and leave with checks you can reuse.
Check the method, Location header, and cache behavior before choosing a redirect or an error status.
Two small read-only helpers turn the public endpoint into evidence you can inspect before and after a release.
Get the method boundary right once, and OPTIONS, HEAD, and idempotent writes stop being a surprise.
Conditionals are the cache’s second clock; a 304 means the stored copy is still the answer.
Read the chain the edge actually presents, not just the leaf, before you trust the rollout.