Support syntax highlighting in org babel block

In normal org block, with no indentation, the syntax highlighting works well. But when the content is indented, all highlighting are removed

For example, the block below does not have syntax highlighting in org-mode. But if you remove the indentation, the highlighting works fine.

**** ex
     #+begin_src verb
     get https://reqbin.com/echo/get/json

     #+end_src

     #+RESULTS:
     #+begin_example
     HTTP/1.1 200 OK
     Date: Wed, 20 Jan 2021 05:23:00 GMT
     Content-Type: application/json
     Content-Length: 19
     Connection: keep-alive
     Cache-Control: max-age=31536000
     CF-Cache-Status: HIT
     Age: 1452
     Accept-Ranges: bytes
     cf-request-id: 07bfd816c00000fd1e18bce000000001
     Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
     Report-To: {"max_age":604800,"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?s=yxb9PT90yNoum90vYgMK726EQExPuN%2Byb7Gx8ebIMur%2Beouwnz4cOG3RWatTZ9Ebm7GK05po5UCF0B9diNVjBVSJdSnFkY0S1YjRqZHM7q1aiJk8xd1z"}],"group":"cf-nel"}
     NEL: {"max_age":604800,"report_to":"cf-nel"}
     Vary: Accept-Encoding
     Server: cloudflare
     CF-RAY: 61465c6acb51fd1e-SYD

     {
       "success": "true"
     }
     #+end_example

federicotdn / verb

Support syntax highlighting in org babel block #32