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/sse

well-formed Server-Sent Events stream — `data:`, `event:`, `id:`, and `retry:` fields all correctly framed, blank-line event separators, four events then close. Content-Type: text/event-stream.

chaos chaos.catastrophic.io

GET /sse

Returns a Server-Sent Events stream with WHATWG EventSource spec violations. Default sends payload lines with no `data:` prefix. Use ?mode= to isolate other violations: named events with no listeners, discontinuous id ordering, or mixed CRLF/LF line endings.

modes: missing-data-prefix event-without-listener id-discontinuity crlf-mix

full chaos docs →

control not.catastrophic.io

GET /sse

well-formed Server-Sent Events stream — `data:`, `event:`, `id:`, and `retry:` fields all correctly framed, blank-line event separators, four events then close. Content-Type: text/event-stream.

full control docs →

Build against not.catastrophic.io/sse, then flip the hostname to chaos.catastrophic.io to exercise the chaos.