Inconsistent responses on inbox methods

[fauno]

While working on the Inbox client I've noticed this:

Method	Path	Status code	Content Type	Response
GET	/v1/:actor/inbox	403	text/plain	"Not allowed"
GET	/v1/:actor/inbox	200	application/json; charset=utf-8	APOrderedCollection
POST	/v1/:actor/inbox	400	application/json; charset=utf-8	{"statusCode"=>400, "error"=>"Unauthorized", "message"=>"Must specify 'actor' URL in activity" }
POST	/v1/:actor/inbox	403	application/json; charset=utf-8	{"statusCode"=>403, "error"=>"Forbidden", "message"=>"Submitted activity must be from signed actor [...]"}
POST	/v1/:actor/inbox	200	text/plain [^1]	{ "message": "ok" }
DELETE	/v1/:actor/inbox/:id	403	text/plain	"Not allowed"
DELETE	/v1/:actor/inbox/:id	200	text/plain	"ok"
POST	/v1/:actor/inbox/:id	403	text/plain	"Not allowed"
POST	/v1/:actor/inbox/:id	200	text/plain	"ok"

https://www.w3.org/TR/activitypub/ doesn't say much about status codes, I see Mastodon just replies 202 Accepted[^2] for every case with an empty response while receiving an activity.

Could we make all errors return a JSON object and AP content type? I'd change the three status codes for remote instances to 202, which doesn't make any promise about the request, just in case someone expects it to be exactly this number.

[^1]: I'll need time to produce all errors, so I read inbox.ts instead. The default response type for this request is set to string. [^2]: Wikipedia: The request has been accepted for processing, but the processing has not been completed. The request might or might not be eventually acted upon, and may be disallowed when processing occurs.