Accept reverse proxy reqs on tailnet #888

Job	Run time
build (zeta, aarch64-linux, ubuntu-24.04-arm)	2m 25s
build (glyph, x86_64-linux, ubuntu-latest)	2m 36s
build (Rhizome, aarch64-darwin, macos-latest)	3m 24s
	8m 25s

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