Deprecated Endpoint Migration Error Block for React

The sunset date and the page's "today" are typed constants at the top of the file (SUNSET and AS_OF), and the days to go are worked out from them, so the server and the browser agree and the number is never typed by hand. Show the same date to machines: send Deprecation and Sunset response headers from the old endpoint, and answer 410 Gone after the day.

A redirect would hide a breaking change from the people who need to act on it. This page says what changes and by when, and leaves the move to the reader. It has no timer: the count is a number of days, not a clock.

The same request written for version 2 in three languages, each line numbered, with a plus mark, a bar and a hidden "Changed:" on the lines that differ from version 1. Arrow keys move between the tabs, and the panel keeps its height whichever tab is open, so the page doesn't move. The code scrolls sideways inside a named region on a narrow screen, which you can reach with the keyboard. Edit the Line lists to match your own change.

Yes: it writes the visible request to the clipboard through the Copy Button, then shows a check, and a polite status message says which one was copied. If the browser refuses (the page isn't served over HTTPS, or permission is denied), the button shows a cross and nothing is announced as copied.

No. The host is a sample (api.pennywire.example) and the snippets read the key from the environment (PENNYWIRE_KEY) instead of showing one, which is the habit worth teaching. Put your real host in, and never put a real key in a page.

The diff lines and the days to go sit side by side from about 380 pixels wide and stack below that. The migration guide button comes before the tabs, so it is on the first screen, and the code panel scrolls sideways in its own region instead of widening the page.