Blackbox exporter Probe failed with http/2 valid version

[Dominique Manas]

Hi,

I want to check HTTP/2 support but it doesn't work:

Configuration: blackbox_exporter-0.16.0.windows-amd64

Config file with this entry specification:
modules:
http_2xx:
prober: http
timeout: 5s
http:
valid_http_versions: ["HTTP/2"]

Check URL: http://localhost:9115/probe?target=https://http2.pro&module=http_2xx&debug=true

Debug result:

Logs for the probe:
ts=2020-04-11T11:23:52.9416524Z caller=main.go:304 module=http_2xx target=https://http2.pro level=info msg="Beginning probe" probe=http timeout_seconds=5
ts=2020-04-11T11:23:52.9416524Z caller=http.go:318 module=http_2xx target=https://http2.pro level=info msg="Resolving target address" ip_protocol=ip6
ts=2020-04-11T11:23:52.9426513Z caller=http.go:318 module=http_2xx target=https://http2.pro level=info msg="Resolved target address" ip=8.9.5.7
ts=2020-04-11T11:23:52.9426513Z caller=client.go:250 module=http_2xx target=https://http2.pro level=info msg="Making HTTP request" url=https://8.9.5.7 host=http2.pro
ts=2020-04-11T11:23:53.239651Z caller=main.go:119 module=http_2xx target=https://http2.pro level=info msg="Received HTTP response" status_code=200
ts=2020-04-11T11:23:53.240652Z caller=main.go:119 module=http_2xx target=https://http2.pro level=error msg="Invalid HTTP version number" version=1.1
ts=2020-04-11T11:23:53.240652Z caller=main.go:119 module=http_2xx target=https://http2.pro level=info msg="Response timings for roundtrip" roundtrip=0 start=2020-04-11T13:23:52.9426513+02:00 dnsDone=2020-04-11T13:23:52.9426513+02:00 connectDone=2020-04-11T13:23:53.0386606+02:00 gotConn=2020-04-11T13:23:53.1406515+02:00 responseStart=2020-04-11T13:23:53.239651+02:00 end=2020-04-11T13:23:53.240652+02:00
ts=2020-04-11T11:23:53.240652Z caller=main.go:304 module=http_2xx target=https://http2.pro level=error msg="Probe failed" duration_seconds=0.2989996

Where is my mistake ??

Thx a lot

[uncle bob]

You are receiving  HTTP reply in 1.1 and your BB exporter expect 2 (which in new BB exporter have to be at least 2.0 btw)