Specifying -http=":" to start an interactive web interface throws an error

[jagandecapri]

What version of pprof are you using?

I'm using pprof via go tool pprof installed with Go version go1.10.3 windows/amd64. I'm invoking the go tool pprof from Git bash installed with Git version 2.9.3.windows.1

What operating system and processor architecture are you using?

GOARCH=amd64
GOOS=windows

What did you do?

Start an interactive web-based interface to pprof by specifying -http=":"

What did you expect to see?

An interactive web-based interface is started in my localhost on a random port as documented in https://github.com/google/pprof#run-pprof-via-a-web-interface which states that

-http=":" starts a server locally at a random port.

What did you see instead?

An error is shown; invalid port number: strconv.Atoi: parsing "": invalid syntax

[aalexand]

Looking at https://github.com/golang/go/blob/go1.10.3/src/cmd/vendor/github.com/google/pprof/internal/driver/webui.go, it appears that go 1.10.3 didn't have the fix 7a927a9#diff-8cab3d39997787bf3d625391eb003743. You can either use latest pprof from this repo, or specify the desired port like "-http :8080".