ORA-29024: Certificate validation failure When Using UTL_HTTP.REQUEST in Autonomous Database

When I execute the following statement that involves a UTL_HTTP.REQUEST call, I get ORA-29024: Certificate validation failure:

SELECT UTL_HTTP.REQUEST('https://www.google.com') from DUAL;

ORA-29273: HTTP request failed 
ORA-06512: at "SYS.UTL_HTTP", line 1620 
ORA-29024: Certificate validation failure 
ORA-06512: at "SYS.UTL_HTTP", line 380 
ORA-06512: at "SYS.UTL_HTTP", line 1560 
ORA-06512: at line 1

According to the Autonomous Database doc, UTL_HTTP is among the supported PL/SQL packages. Why is this query not working?

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