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Unencrypted HTTP/2 stops canceling request contexts; localhost resolves to loopback
By RepoJournal · Filed · About Go · Composed from the cited sources · methodology
Two net fixes from Brad Fitzpatrick land in golang/go, one regressing requests over unencrypted HTTP/2 and one aligning the Go resolver with RFC 6761's treatment of localhost.
net/http: don't cancel request contexts on idle unencrypted HTTP/2 conns golang/go
The unencrypted HTTP/2 path was handing the HTTP/2 server a context that gets canceled as soon as conn.serve returns, which now happens immediately because the serve goroutine parks, so every request context on an h2c connection was being canceled mid-flight. The fix passes the connection context instead, matching what the TLS ALPN path already did. If you run h2c servers, this is the one to pull.
net: resolve localhost names to loopback in the Go resolver golang/go
RFC 6761 section 6.3 says resolution APIs should always return the loopback address for localhost and names under .localhost, and should not forward those queries to the configured caching DNS servers. The Go resolver did neither, resolving from the hosts file and querying upstream otherwise; it now follows the spec. Behavior change for anyone relying on hosts-file mappings or custom DNS entrie...
hash/adler32: add vectorized implementation for amd64 golang/go
An AVX2 kernel using the goexperiment.simd archsimd intrinsics processes 32 bytes per iteration via VPSADBW and VPMADDUBSW, deferring modular reduction across each nmax-bounded run of blocks. The arm64 counterpart adds a NEON path with the same 32-byte block and the same dispatch rules: AVX2 or NEON when available, scalar loop for inputs under 64 bytes and builds without the simd experiment.
go/ssa: preserve single-case receive assignment order golang/tools
A single-case select was lowered like an ordinary assignment, which evaluates the left-hand side before the receive, while select semantics require the receive and communication to happen first. Receive is now evaluated before the assignment left-hand side is constructed, with the existing single-case fast path and SSA shape otherwise retained. Anyone reading SSA output for select-based code wi...
deploy: use Go 1.27.1 for builds and deployments golang/pkgsite
Go 1.27 is out, so pkgsite's _GO_VERSION moves off the release candidate to the latest 1.27 patch release, and the Docker Compose section of deploy/README.md no longer keeps a second hardcoded copy of the version. Elsewhere: gopls's resolve_target command lands with restrictions on qualified package paths and no Range or TextDocument inference yet, vulndb adds six reports, and golang/net's QUIC...
