I remember DDG uses GET by default. It's not private because search queries are included in URL.
Could you change the default setting?
posted by Alphabet_song.ogg 1 year and 10 months ago Link

It's only a local privacy issue (displays in browser URL field) and most users want the search URL displayed so it can be copies\pasted. If your preference is to have it disabled you can do so in settings use one of the save methods or use the DDG bookmarklet URL:
posted by x.15a2 Community Leader1 year and 10 months ago Link