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📝 Clarify comment about SSE event terminator - #16354
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Closes: #16265
Description
The docstring of
format_sse_eventmistakenly states that each event end up with two end-of-line characters:fastapi/fastapi/sse.py
Line 210 in 50113da
In fact, according to the specification, event can be empty (no comments and no fields) and then it will be just one empty line.
So, two end-of-line characters in the end is only true for non-empty events. First end-of-line character is actually a part of field or comment and second (empty line) is an event terminator.
AI Disclaimer
I used AI (Codex) to investigate, but it was mostly misleading until I learned how to read the notation in the spec and figured out the solution by myself and explained my thoughts. Then Codex approved my approach.
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