Just took the following sample program from the documentation but it gives me:
ERROR: Compilation error.
ERROR: Extension tkhttp for package http is not a DS2 package.
ERROR: No package or extension for type package http.
proc ds2;
data _null_;
method run();
/* instantiate the package */
declare package http h();
declare varchar(1024) character set utf8 body;
declare int rc;
/* create a GET */
h.createGetMethod('http://api.worldbank.org/countries/fr/');
/* execute the GET */
h.executeMethod();
/* retrieve the response body as a string */
h.getResponseBodyAsString(body, rc);
put body;
end;
run;
quit;