util+server: Fix bug around chunked request handling. #10558

Job	Run time
Go Lint	1m 36s
Generate Code	1m 5s
YAML Lint	16s
Rego PR checks	1m 28s
Go Test (linux)	4m 33s
Check Generated	24s
Go compat build/test (ubuntu-22.04, 1.21)	2m 20s
Go Test (darwin)	3m 59s
Go Build (linux amd64)	2m 28s
Go compat build/test (macos-14, 1.21)	3m 21s
Go Build (linux arm64)	2m 4s
Go Race Detector	5m 58s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	1m 59s
WASM	10s
Go Build (windows amd64)	2m 19s
Go Build (darwin amd64)	1m 24s
Go Build (darwin arm64)	1m 1s
docker image smoke test	30s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	16s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	14s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	31s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	14s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	38s
	38m 48s

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