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About GF.dev HTTP/3 & QUIC Check
The HTTP/3 & QUIC Check is one of the GF.dev Geek Tools. It fetches a site's response headers and looks for the Alt-Svc directive, which tells browsers that the site can be reached over HTTP/3 (h3), usually on UDP port 443.
It checks the advertisement only and does not open an actual QUIC connection, so it confirms configuration rather than proving that HTTP/3 traffic works end to end. The page includes a short FAQ and links to a guide on enabling HTTP/2 and HTTP/3.
Strengths
- Fast check for the Alt-Svc header
- Nothing to install
- Linked guide on enabling HTTP/3
Limitations
- Does not test a real QUIC connection
- Only checks servers reachable from the internet
Details
- Pricing
- FreeFree to use in the browser.
- License
- Proprietary
- Developer
- GF.dev
- Platforms
- Web
- How it runs
- Web application
- Works offline
- No
- Best suited for
- Confirming a site advertises HTTP/3 after a server or CDN change
- Categories
- Website testing
- Last verified
- Added
- Provenance
- Selected from the TechWalrus Resource Hub (Website Checkers & Audit Tools); facts checked against the developer's own pages, 2 sources on file.