APEX_WEB_SERVICE.MAKE_REST_REQUEST giving ORA-29267: illegal call if provided with username & pwd

Hi Buddies,

I have a ws request which has basic authentication set.

First, i tried without giving username & pwd. It gave me authorisation failed. (that means i am able to hit the target url succesfully).

WS_RESPONSE := APEX_WEB_SERVICE.MAKE_REST_REQUEST

(

p_url => <target url>,

p_http_method => 'POST',

p_body => '{ field1:value1 }',

p_wallet_path => <wallet_path>,

p_wallet_pwd  => <wallet_pwd>

);

o/p :

i get html response beginning with :  <TITLE>Error 401--Unauthorized</TITLE>

Next, I am giving both userrname & pwd. BUT now it throws ORA-29267: illegal call ERROR.

WS_RESPONSE := APEX_WEB_SERVICE.MAKE_REST_REQUEST

(

p_url => <target url>,

p_http_method => 'POST',

p_body => '{ field1:value1 }',

p_username => <username>,

p_password => <pwd>,

p_wallet_path => <wallet_path>,

p_wallet_pwd  => <wallet_pwd>

);

o/p:

ORA-29273: HTTP request failed

ORA-06512: at "SYS.UTL_HTTP", line 1185

ORA-29267: illegal call

FYI : I am calling the API inside a stand alone procedure.

Kindly provide me some inputs on this.

Thanks,

Praveen