compute_ctl API doesn't send content-type header in responses

[prepor]

Steps to reproduce

❯ curl -vvv 'localhost:$PORT/info'
* Host localhost:55433 was resolved.
* IPv6: ::1
* IPv4: 127.0.0.1
*   Trying [::1]:55433...
* Connected to localhost (::1) port 55433
> GET /info HTTP/1.1
> Host: localhost:55433
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< content-length: 15
< date: Tue, 07 May 2024 08:56:10 GMT
<
* Connection #0 to host localhost left intact
{"num_cpus":10}%

Expected result

content-type:application/json

Actual result

No content-type header at all.

Environment

Logs, links

• discussion compute_ctl: catalog API endpoints #7575 (comment)