Browser-only tools
- WebSocket close code lookupEnter a WebSocket close code to get its meaning, the spec that defines it, and what usually causes it.
- Sec-WebSocket-Accept calculatorTurn a Sec-WebSocket-Key into the Sec-WebSocket-Accept a server must answer with, and check a pair you already have.
- SSE stream parserPaste a raw Server-Sent Events stream and see the events, ids, retry hints and framing mistakes.
- HAR viewerOpen a HAR file and read the requests, headers, bodies and timings.