HTTP headers / response header

Access-Control-Allow-Methods

Access-Control-Allow-Methods: GET, POST, PATCH

What it does

Preflight answer: which HTTP methods the cross-origin caller may use.

The gotcha

Only consulted on preflighted requests; forgetting PATCH here is the classic "PUT works but PATCH fails with CORS error".

Debugging headers on a phone

The fastest way to see what Access-Control-Allow-Methods is actually doing is to send the request and read both sides raw — ReqPad shows auto-generated and custom headers for every request, on all six protocols, with history. Related references: status codes · WWW-Authenticate · Content-Encoding · Transfer-Encoding · ETag · Last-Modified · Expires

Inspect Access-Control-Allow-Methods on a live request.

Build the request, send it, read raw headers and timing — from your iPhone. Free to start.

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