Replace error-deferred for HEAD implementation #322
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Currently we're creating deferred errors which are never consumed (these log exceptions when the next GC cycle runs), instead we can simply throw to be caught be the outer deferred chain and handled in the normal catch block in yada.handler/handle-request-with-maybe-subresources. The only distinction from existing behaviour is that we will now return a 406 in line with GET when we have no available representation for the HEAD, whereas previously we would return a 200. This aligns with the principle that the HEAD response should reflect the GET other than providing a response body.
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Currently we're creating deferred errors which are never consumed (these log
exceptions when the next GC cycle runs), instead we can simply throw exceptions to be
caught be the outer deferred chain and handled in the normal catch block in
yada.handler/handle-request-with-maybe-subresources.The only distinction from existing behaviour is that we will now return a 406 in
line with GET when we have no available representation for the HEAD, whereas
previously we would return a 200.
This aligns with the principle that the HEAD response should reflect the GET
other than providing a response body.
This PR should address #206.