http1.dev - HTTP version checker

Showing cached scan results from 41 minutes ago. New scans within the last 4 hours reuse cached data to stay fast.

%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3

https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443

F (40)

Signal	Status	Detail
HTTP/1.0	Pass	Request build failed
HTTP/1.1	Pass	Not supported (or probe failed): Get "https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443": dial tcp: lookup %27%3E%3Casdf%20alt%3D%22%22%3E-f3f3: no such host
HTTP/2.0	Fail	Not supported (or probe failed): Get "https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443": dial tcp: lookup %27%3E%3Casdf%20alt%3D%22%22%3E-f3f3: no such host
HTTP/3.0	Fail	Not supported (or probe failed): Get "https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443": lookup %27%3E%3Casdf%20alt%3D%22%22%3E-f3f3: no such host
HTTP/3 via ALPN on 443	Fail	Used for grading (A when HTTP/3 is available).
HTTP/2 via ALPN on 443	Fail	Required for grades B/C when HTTP/3 is not available.
TLS version on HTTP/2	unknown	TLS 1.3 → A/B, TLS 1.2 → C, anything else → treated as legacy.

Recently scanned

Latest

Host	Age
'><asdf alt="">-f3f3 https://&:443#x27;><asdf%20alt="">-f3f3	12 minutes ago
%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3 https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443	41 minutes ago

Best (most modern)

Host	Support

Worst (least modern)

Host	Support
'><asdf alt="">-f3f3 https://&:443#x27;><asdf%20alt="">-f3f3	F (40)
%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3 https://%2527%253E%253Casdf%2520alt%253D%2522%2522%253E-f3f3:443	F (40)