Sends a form to an address somebody registered to be sent it at; the
answer's body is drained and discarded unless keepBody is asked for.
Never rejects.
the entry carrying the address under attribute, and id
for the log
the attribute holding the address, one of SENDABLE
the name and value pairs, sent form-urlencoded
Optionaloptions: DeliverOptions
timeoutMs, and keepBody to keep the answer's body
a promise of { ok, status, kind, why, url, cacheControl }, with
body and contentType when kept
Forwards to
FederationHttp.deliverForm().