Merge pull request #47796 from cpuguy83/fix_superfluous_write_header #175

Job	Run time
validate-dco / run	17s
build	1m 55s
test (dockerd, client, integration)	16m 22s
test (dockerd, cmd/buildctl, integration)	6m 15s
test (dockerd, solver, integration)	6m 8s
test (dockerd, frontend, integration)	6m 33s
test (dockerd, frontend/dockerfile, integration)	19m 50s
test (dockerd-containerd, client, integration)	18m 14s
test (dockerd-containerd, cmd/buildctl, integration)	6m 25s
test (dockerd-containerd, solver, integration)	6m 24s
test (dockerd-containerd, frontend, integration)	6m 30s
test (dockerd-containerd, frontend/dockerfile, integration)	20m 43s
	1h 55m 36s

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