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CREATE OR REPLACE FUNCTION get(uri character varying)
  RETURNS json AS
...
$BODY$
  LANGUAGE plpython2u VOLATILE
  COST 100;

CREATE OR REPLACE FUNCTION get(input_url character varying)
  RETURNS json AS
...
$BODY$
  LANGUAGE plperl VOLATILE
  COST 100;

select get('ipinfo.io/ip');

...
ERROR: Undefined subroutine &main::get called at line 6.
SQL state: 38000
Context: PL/Perl function "get"