Consuming webservice by SQL Server procedure - sql-server

Question

I am using sql server 2016 to consume webservice through store procedure. I have a webservice in JSON returning the following:
["Name":"Rebecca","email":"rebecca#hotmail.com","ra":"12345"},
{"name":"Caroline","email":"caroline#hotmail.com","ra":"23456"},
{"name":"Vanessa","email":"vanessa#yahoo.com.br","ra":"99999"}]
I can consume it by passing a variable. If I leave my webservice to receive a parameter and pass it I can return the name and email of the student. But if I leave my webservice without the need to receive parameter and remove the procedure parameter pass and execute, my procedure returns null. What do I need to change in my code to be able to return the complete list of students my webservice exposes?
Here's my code:
create PROCEDURE webservice_parametros (#RA as varchar (5))
AS
BEGIN
DECLARE #OBJ INT;
DECLARE #URL VARCHAR(200);
DECLARE #RESPONSE VARCHAR(8000);
SET #URL = 'http://dominio:8080/v1/alunos/' + #RA
EXEC SP_OACREATE 'MSXML2.ServerXMLHttp', #OBJ out
EXEC SP_OAMETHOD #OBJ, 'OPEN', NULL, 'GET', #URL, FALSE
EXEC SP_OAMETHOD #OBJ, 'SEND'
exec SP_OAGETPROPERTY #OBJ, 'responseText', #RESPONSE out
EXEC SP_OADESTROY #OBJ
SELECT JSON_VALUE(#RESPONSE, '$.nome') as nome,
JSON_VALUE(#RESPONSE, '$.email') as email
END
execute webservice_parametros '12345'
My code that returns NULL
create PROCEDURE webservice
AS
BEGIN
DECLARE #OBJ INT;
DECLARE #URL VARCHAR(200);
DECLARE #RESPONSE VARCHAR(8000);
SET #URL = 'http://dominio:8080/v1/alunos/'
EXEC SP_OACREATE 'MSXML2.ServerXMLHttp', #OBJ out
EXEC SP_OAMETHOD #OBJ, 'OPEN', NULL, 'GET', #URL, FALSE
EXEC SP_OAMETHOD #OBJ, 'SEND'
exec SP_OAGETPROPERTY #OBJ, 'responseText', #RESPONSE out
EXEC SP_OADESTROY #OBJ
SELECT JSON_VALUE(#RESPONSE, '$.nome') as nome,
JSON_VALUE(#RESPONSE, '$.email') as email
END
execute webservice