HTTP/2 Support

n Cypress 16, requests use HTTP/2 whenever the server supports it, in Chromium-based browsers, with no changes to your tests.

Request-heavy pages get faster. HTTP/2 multiplexes many requests over one connection instead of queuing them behind a small number of parallel slots. In our benchmark loading 1,000 images, the HTTP/2 page finished in 1,362ms against 3,896ms over HTTP/1.1. If your pages fire off many small requests, especially through a Vite dev server, you should feel the difference in open mode and in CI.

Streaming features become testable. Over HTTP/1.1, browsers cap Server-Sent Events at six connections per domain. That limit put upload progress indicators, live notifications, and activity feeds effectively out of reach. Over HTTP/2, the number of concurrent streams is negotiated with the server and defaults to 100. If you gave up on testing a streaming workflow, it is worth another look.