Implement RFC9530 Content-Digest as an http.RoundTripper
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This implements an http.RoundTripper which transparently calculates RFC9530-compatible Content-Digest headers for outgoing requests. This header will be needed if we in future wish to sign request bodies with RFC9421.
Generating new byte buffers for every single processed request is quite
wasteful and generates a lot of work for the GC.
Similarly, the hash.Hash struct can be reused, although this provides
only a small additional benefit.
Before:
goos: darwin
goarch: arm64
pkg: github.com/replicate/go/http/digest
BenchmarkTransport-10 9200 123811 ns/op 1058.65 MB/s 525456 B/op 24 allocs/op
PASS
ok github.com/replicate/go/http/digest 6.684s
After:
goos: darwin
goarch: arm64
pkg: github.com/replicate/go/http/digest
BenchmarkTransport-10 12412 95642 ns/op 1370.45 MB/s 1450 B/op 12 allocs/op
PASS
ok github.com/replicate/go/http/digest 14.619s
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This implements an
http.RoundTripperwhich transparently calculates RFC9530-compatible Content-Digest headers for outgoing requests. This header will be needed if we in future wish to sign request bodies with RFC9421.