make a GET request using APEX - oracle-apex

Question

this question is simple.
¿Why i can't use the next code?
select apex_web_service.make_rest_request(
--p_url => 'https://api.exchangeratesapi.io/history?start_at=2018-01-01\&\end_at=2018-09-01',
p_url => 'https://api.exchangeratesapi.io/history?',
p_http_method => 'GET',
p_parm_name => APEX_UTIL.string_to_table('start_at:end_at'),
--p_parm_value => APEX_UTIL.string_to_table('"2018-01-01":"2018-09-01"')
--p_parm_value => APEX_UTIL.string_to_table('"2018-01-01"' || ':' || '"2018-09-01"')
--p_parm_value => APEX_UTIL.string_to_table('2018-01-01:2018-09-01', ':')
p_parm_value => APEX_UTIL.string_to_table('2018-01-01:2018-09-01')
) as test
from dual;
This is the error:
ORA-00902: tipo de dato no válido
00902. 00000 - "invalid datatype"
*Cause:
*Action:
Error en la línea: 20, columna: 22
I also try with this form:
declare
l_clob clob;
begin
l_clob := APEX_WEB_SERVICE.make_rest_request(
p_url => 'https://api.exchangeratesapi.io/history',
p_http_method => 'GET',
--p_parm_name => APEX_UTIL.string_to_table('"start_at"' || ':' ||'"end_at"'),
p_parm_name => APEX_UTIL.string_to_table('start_at:end_at'),
--p_parm_value => APEX_UTIL.string_to_table('"2018-01-01"' || ':' || '"2018-09-01"')
p_parm_value => APEX_UTIL.string_to_table('2018-01-01' || ':' || '2018-09-01')
--p_parm_value => APEX_UTIL.string_to_table(2018-01-01 || ':' || 2018-09-01)
--p_parm_value => APEX_UTIL.string_to_table('2018-01-01:2018-09-01')
) ;
dbms_output.put_line(l_clob);
end;
/
and this is the error:
Informe de error -
ORA-06502: PL/SQL: error numérico o de valor
ORA-06512: en línea 14
06502. 00000 - "PL/SQL: numeric or value error%s"
*Cause: An arithmetic, numeric, string, conversion, or constraint error
occurred. For example, this error occurs if an attempt is made to
assign the value NULL to a variable declared NOT NULL, or if an
attempt is made to assign an integer larger than 99 to a variable
declared NUMBER(2).
*Action: Change the data, how it is manipulated, or how it is declared so
that values do not violate constraints.
I want get this json:
https://api.exchangeratesapi.io/history?start_at=2018-01-01&end_at=2018-09-01
I try with postman, and works
There are several comments, are test's but doesn't work.
Does really works p_parm_name and p_parm_value?
Can somebody help me?
Regards

Answer 1

The problem is with your dbms_output.put_line. dbms_output.put_line is limited to a VARCHAR2, or 32,767 bytes. If you use the following code, you'll see that you're getting a result. The size I got was 74,037.
declare
l_clob clob;
begin
l_clob := APEX_WEB_SERVICE.make_rest_request(
p_url => 'https://api.exchangeratesapi.io/history',
p_http_method => 'GET',
p_parm_name => APEX_UTIL.string_to_table('start_at:end_at'),
p_parm_value => APEX_UTIL.string_to_table('2018-01-01' || ':' || '2018-09-01')
) ;
dbms_output.put_line(dbms_lob.getlength(l_clob));
end;
/