Can't use go tool pprof with an existing server

Question

I have an existing http server which I would like to profile. I have included _ "net/http/pprof"to my imports, and I already have http server running:

router := createRouter()
server := &http.Server {
    Addr:           ":8080",
    Handler:        router,
    ReadTimeout:    15*time.Second,
    WriteTimeout:   15*time.Second,
//  MaxHeaderBytes: 4096,
}

log.Fatal(server.ListenAndServe())

When I'm trying to access http://localhost:8080/debug/pprof/ I get 404 page not found.

That's what I get when using go tool pprof on a local machine:

userver@userver:~/Desktop/gotest$ go tool pprof http://192.168.0.27:8080/
Use of uninitialized value $prefix in concatenation (.) or string at /usr/lib/go/pkg/tool/linux_amd64/pprof line 3019.
Read http://192.168.0.27:8080/pprof/symbol
Failed to get the number of symbols from http://192.168.0.27:8080/pprof/symbol

userver@userver:~/Desktop/gotest$ go tool pprof http://localhost:8080/debug/pprof/profile
Read http://localhost:8080/debug/pprof/symbol
Failed to get the number of symbols from http://localhost:8080/debug/pprof/symbol

Same for a remote client:

MacBookAir:~ apple$ go tool pprof http://192.168.0.27:8080/
Use of uninitialized value $prefix in concatenation (.) or string at /usr/local/Cellar/go/1.3.2/libexec/pkg/tool/darwin_amd64/pprof line 3027.
Read http://192.168.0.27:8080/pprof/symbol
Failed to get the number of symbols from http://192.168.0.27:8080/pprof/symbol

Answer 1

It's not explicitly mentioned in the documentation, but net/http/pprof only registers its handlers with http.DefaultServeMux.

From the source:

func init() {
        http.Handle("/debug/pprof/", http.HandlerFunc(Index))
        http.Handle("/debug/pprof/cmdline", http.HandlerFunc(Cmdline))
        http.Handle("/debug/pprof/profile", http.HandlerFunc(Profile))
        http.Handle("/debug/pprof/symbol", http.HandlerFunc(Symbol))
        http.Handle("/debug/pprof/trace", http.HandlerFunc(Trace))
}

If you're not using the default mux you just have to register any/all of those you want with whatever mux you're using, e.g. something like mymux.HandleFunc("…", pprof.Index), etc.

Alternatively you can listen on a separate port (also possibly bound to only localhost if desired) with the default mux as you've shown.

Answer 2

Looks like the problem was in a *mux.Router used from github.com/gorilla/mux which I used as a Handler in my http.Server instance.

Solution: just launch one more server just for the pprof:

server := &http.Server {
    Addr:           ":8080",
    Handler:        router,
    ReadTimeout:    15*time.Second,
    WriteTimeout:   15*time.Second,
}
go func() {
    log.Println(http.ListenAndServe(":6060", nil))
}()
log.Fatal(server.ListenAndServe())

Answer 3

If you're using a github.com/gorilla/mux.Router you can simply hand off any request prefixed with /debug/ to the http.DefaultServeMux.

import _ "net/http/debug"
router := mux.NewRouter()
router.PathPrefix("/debug/").Handler(http.DefaultServeMux)