Also, look at the body of the HTTP error response (again, tcpdump can help there) and you may get a clue. For example:
# *curl -v localhost:9116/snmp* * Trying 127.0.0.1:9116... * TCP_NODELAY set * Connected to localhost (127.0.0.1) port 9116 (#0) > GET /snmp HTTP/1.1 > Host: localhost:9116 > User-Agent: curl/7.68.0 > Accept: */* > * Mark bundle as not supporting multiuse *< HTTP/1.1 400 Bad Request* < Content-Type: text/plain; charset=utf-8 < X-Content-Type-Options: nosniff < Date: Thu, 22 Dec 2022 14:04:17 GMT < Content-Length: 42 < *'target' parameter must be specified once* * Connection #0 to host localhost left intact # *curl -v 'localhost:9116/snmp?target=1.2.3.4&module=wombat'* * Trying 127.0.0.1:9116... * TCP_NODELAY set * Connected to localhost (127.0.0.1) port 9116 (#0) > GET /snmp?target=1.2.3.4&module=wombat HTTP/1.1 > Host: localhost:9116 > User-Agent: curl/7.68.0 > Accept: */* > * Mark bundle as not supporting multiuse *< HTTP/1.1 400 Bad Request*< Content-Type: text/plain; charset=utf-8 < X-Content-Type-Options: nosniff < Date: Thu, 22 Dec 2022 14:06:45 GMT < Content-Length: 24 < *Unknown module 'wombat'* * Connection #0 to host localhost left intact On Thursday, 22 December 2022 at 11:50:13 UTC Brian Candler wrote: > That's an error telling you that *you* did something wrong. > > If you want *us* to help you find the solution to your problem, then > you'll need to show some more information [^1]. What request are you > sending? If it's curl, show the command line. If it's a prometheus scrape, > then show the scrape job configuration. > > You can also look at the actual request and response using tcpdump: e.g. > if you're sending requests to snmp_exporter on localhost (127.0.0.1), which > is a common configuration, then: > > tcpdump -i lo -nn -s0 -A tcp port 9116 > > [^1] Recommended reading: > http://www.catb.org/~esr/faqs/smart-questions.html#intro > > On Thursday, 22 December 2022 at 10:38:12 UTC ktorce wrote: > >> "server returned HTTP status 400 Bad Request" >> >> -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/fd7de4cd-831b-44b3-b132-ad9aef2c2458n%40googlegroups.com.
