rpc: allow dumb empty requests for AWS health checks #15496
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A while back, in #15220 we've introduced an extra limitation in our HTTP RPC to reject all requests that do not have
application/jsonas the content type. This was needed to prevent the circumvention of CORS checks in certain browsers.This however meant that dumb, empty HTTP GET requests now return a failure. Whilst this sounds a good idea, it also breaks the AWS load balancer health checks, as those simply issue a GET on load balanced ports and kill the backing services if they don't reply with 200 #15490.
This PR makes a special case exception, so that if someone sends an empty HTTP GET request to our HTTP RPC endpoint, instead of rejecting it, we just return immediately, causing a 200 code.