I don't think it's poor to test http handling either, as a coarse grained integration test.
The problem I've seen is over-dependence on writing unit tests with mocks instead of biting the bullet and properly testing all the boundaries. I have seen folk end up with 1000+ tests, of which most are useless because the mocks make far too many assumptions, but are necessary because of the layer coupling.
This was mostly in Node though, where mocking the request/response gets done inconsistently, per framework. Go might have better tooling in that regard, and maybe that sways the equation a bit. IMO there's still merit to decoupling if there's any feasibility of e.g. migrating to GraphQL or another protocol without having to undergo an entire re-write.
The problem I've seen is over-dependence on writing unit tests with mocks instead of biting the bullet and properly testing all the boundaries. I have seen folk end up with 1000+ tests, of which most are useless because the mocks make far too many assumptions, but are necessary because of the layer coupling.
This was mostly in Node though, where mocking the request/response gets done inconsistently, per framework. Go might have better tooling in that regard, and maybe that sways the equation a bit. IMO there's still merit to decoupling if there's any feasibility of e.g. migrating to GraphQL or another protocol without having to undergo an entire re-write.