datasette-referrer-policy 0.1

# Release: datasette-referrer-policy 0.1 Source: [https://simonwillison.net/2026/May/5/datasette-referrer-policy/](https://simonwillison.net/2026/May/5/datasette-referrer-policy/) The OpenStreetMap tiles on the Datasette[global\-power\-plants demo](https://datasette.io/global-power-plants/global-power-plants)weren't displaying correctly\. This turned out to be caused by two bugs\. The first is that the CAPTCHA[I added](https://github.com/simonw/datasette-turnstile)to that site a few weeks ago was triggering for the`\.json`fetch requests used by the map plugin, and since those weren't HTML the user was not being asked to solve them\. Here's[the fix](https://github.com/simonw/datasette.io/commit/23a1c8596b75b2094db46035a3b4280109fb3df3)\. The second was that OpenStreetMap quite reasonably[block tile requests](https://wiki.openstreetmap.org/wiki/Referer)from sites that use a`Referrer\-Policy: no\-referrer`header\. Datasette does this by default, and I didn't want to change that default on people without warning \- so I had Codex \+ GPT\-5\.5[build me](https://gisthost.github.io/?402f2f23ee3dbfa251bf0d216e0224f7)a new plugin to help set that header to another value\.