HTTP/2 200 date: Wed, 08 Oct 2025 18:19:42 GMT content-type: text/plain content-length: 324 cf-ray: 98b7a5e408a0c1c4-BLR last-modified: Wed, 10 Jul 2013 08:26:57 GMT etag: "218-4e1240a6f9640-gzip" cache-control: max-age=21600 expires: Thu, 09 Oct 2025 00:19:42 GMT vary: Accept-Encoding content-encoding: gzip x-backend: www-mirrors x-request-id: 98b7a5e408a0c1c4 strict-transport-security: max-age=15552000; includeSubdomains; preload content-security-policy: frame-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests cf-cache-status: BYPASS accept-ranges: bytes set-cookie: __cf_bm=bn.hjib214EJA137dIPQpAw1ly2M5D9g2tYIa8VWwjM-1759947582-1.0.1.1-NGWvxUeM6YcMyvP1aFoUfVz89U1Tq4TDoTbjsqf_PKEGHigkhZKfeyjtEtp03mbywV5kUlPyDodZDwooNNjR3IdCrl_MToIWUPbwujPzUkI; path=/; expires=Wed, 08-Oct-25 18:49:42 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None server: cloudflare alt-svc: h3=":443"; ma=86400 In this discussion, I present pump.io, a simple, efficient standards-based social stream server. The API daemon uses the Activity Streams JSON standard and a simple RESTful API to provide most of the functionality needed for social features. It can be used for mobile apps, as a social add-on to otherwise asocial programs, or as the core of a primarily social application. With Webfinger and dynamic OAuth client registration, the server also provides a simple but featureful social federation system.