Prometheus scrape over HTTPS with Haproxy

I have a Prometheus instance running locally, trying to scrape metrics from cAdvisor through HAPproxy.The Prometheus job:

- job_name: cadvisor_server  scheme: https  static_configs:  - targets: [ 'n1-cadvisor.proxy.cl:443' ]  tls_config:    ca_file: /etc/prometheus/ca-bundle.crt

The HAProxy configuration (backend):

backend n1_monitoring  http-response set-header Access-Control-Allow-Origin "*"  http-response set-header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept, Authorisation, JSNLog-RequestId, activityId, activeId, applicationId, applicationUserId, channelId, senderId, sessionId"  http-response set-header Access-Control-Max-Age 3628800  http-response set-header Access-Control-Allow-Methods "GET"  option httpchk GET /metrics  http-check expect ! rstatus ^[4-5]  server n1 n1.localdomain:8087

HAProxy stats show the backend as operational, when I connect via browser I see metrics. When I curl from my computer I see metrics. When I curl from inside the Prometheus container I see metrics. When I replaced the proxy address with the host and port in Prometheus' targets, I get metrics.

But when I use Prometheus to query I see server returned HTTP status 404 not found, and on HAProxy I see the log proxy.cl~ nomatch/<NOSRV> along with 404.I'd appreciate any help!

I tried curls and wgets locally and from the Prometheus server. All of them worked as expected. Prometheus' log shows 404. cAdvisor's logs show nothing.