[semidet,multifile]http:post_data_hook(+Term, 
+Out, +Options)post(Data) 
option of http_open/3. The 
default implementation supports
prolog(Term), sending a Prolog term as application/x-prolog.
[semidet,multifile]http:post_data_hook(+Data, 
+Out:stream, +HdrExtra)http_post(URL, json(Term), Reply, Options) http_post(URL, json(Term, Options), Reply, Options)
If Options are passed, these are handed to json_write/3. In addition, this option is processed:
dict, json_write_dict/3 
is used to write the output. This is default if json(Dict) 
is passed.