UI and server

Words

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• Cursor pagination

  Each page asks for the items after the last one you already have, using a cursor such as that item's id.

• Debounce

  Wait until something has stopped happening for a short time, then act once.

• Offset pagination

  Each page skips a number of rows and takes the next few, so page 3 with 20 per page means skip 40, take 20.

• Optimistic update

  The screen shows the result of your action right away, before the server has confirmed it.

• Polling

  The page asks the server "anything new?" again and again on a timer, for example every 5 seconds.

• Rate-limit message (429)

  What the user sees when the server says "too many requests, slow down" (HTTP status 429).

• Request timeout

  The longest time the page or the server will wait for an answer before giving up.

• Retry with backoff

  When a request fails for a reason that may pass, try again, but wait longer before each new try (for example 1 s, 2 s, then 4 s).

• Server-sent events (SSE)

  The page opens one connection that stays open, and the server pushes a message down it each time something happens.

• Throttle

  Let something run at most once per time interval, however often it is triggered.

• WebSocket

  One connection between the page and the server that stays open and carries messages in both directions at any time.