Pihole exporter cannot handle pihole running behind reverse proxy over without /admin

[sanfx]

I have pihole running on my https://pihole.domain.com
but if we pass args to pihole exporter it translate URL to the one cotnaining /admin i.e. https://pihole.domain.com/admin/api.php
see example:

# docker exec -it 2db7 ./pihole-exporter -port 9618 -pihole_hostname pihole.domain.com -pihole_api_token e30e161a388be00d32fs41f2b753d3691785ecc1dbf9bc8ef291bs30f4f18b75 -pihole_protocol https -pihole_port 443

results in :

2022/01/23 06:28:05 ------------------------------------
2022/01/23 06:28:05 -  PI-Hole exporter configuration  -
2022/01/23 06:28:05 ------------------------------------
2022/01/23 06:28:05 PIHoleProtocol : https
2022/01/23 06:28:05 PIHoleHostname : pihole.domain.com
2022/01/23 06:28:05 PIHolePort : 443
2022/01/23 06:28:05 Pi-Hole Authentication Method : PIHoleApiToken
2022/01/23 06:28:05 Port : 9618
2022/01/23 06:28:05 Interval : 10s
2022/01/23 06:28:05 ------------------------------------
2022/01/23 06:28:05 New Prometheus metric registered: domains_blocked
2022/01/23 06:28:05 New Prometheus metric registered: dns_queries_today
2022/01/23 06:28:05 New Prometheus metric registered: ads_blocked_today
2022/01/23 06:28:05 New Prometheus metric registered: ads_percentag_today
2022/01/23 06:28:05 New Prometheus metric registered: unique_domains
2022/01/23 06:28:05 New Prometheus metric registered: queries_forwarded
2022/01/23 06:28:05 New Prometheus metric registered: queries_cached
2022/01/23 06:28:05 New Prometheus metric registered: clients_ever_seen
2022/01/23 06:28:05 New Prometheus metric registered: unique_clients
2022/01/23 06:28:05 New Prometheus metric registered: dns_queries_all_types
2022/01/23 06:28:05 New Prometheus metric registered: reply
2022/01/23 06:28:05 New Prometheus metric registered: top_queries
2022/01/23 06:28:05 New Prometheus metric registered: top_ads
2022/01/23 06:28:05 New Prometheus metric registered: top_sources
2022/01/23 06:28:05 New Prometheus metric registered: forward_destinations
2022/01/23 06:28:05 New Prometheus metric registered: querytypes
2022/01/23 06:28:05 New Prometheus metric registered: status
2022/01/23 06:28:05 Starting HTTP server
2022/01/23 06:28:15 An error has occured during retrieving PI-Hole statistics Get "https://pihole.domain.com:443/admin/api.php?summaryRaw&overTimeData&topItems&recentItems&getQueryTypes&getForwardDestinations&getQuerySources&jsonForceObject&auth=e30e161a388be00d32f341f2b753d3691785ecc1dbf9bc8ef291b130f4f18b75": x509: certificate signed by unknown authority
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x8158aa]

goroutine 25 [running]:
github.com/eko/pihole-exporter/internal/pihole.(*Client).getStatistics(0xc0001203f0, 0xc000038790)
	/go/src/github.com/eko/pihole-exporter/internal/pihole/client.go:163 +0x2ea
github.com/eko/pihole-exporter/internal/pihole.(*Client).Scrape(0xc0001203f0)
	/go/src/github.com/eko/pihole-exporter/internal/pihole/client.go:61 +0x88
created by main.initPiHoleClient
	/go/src/github.com/eko/pihole-exporter/main.go:37 +0xc5

Notice the URL has /admin . if I remove the /admin the pihole API URL gives result.

[Auxtal]

Any updates on this?