google cloud platform - minimal stackdriver trace client usage failing -


here's minification of using stackdriver trace go client package.

it seems trivial example should work produces error.

package main  import (     "context"     "flag"     "log"     "net/http"      "cloud.google.com/go/trace"     "github.com/davecgh/go-spew/spew"     "google.golang.org/api/option" )  var (     projectid         = flag.string("projectid", "", "projcect id")     serviceaccountkey = flag.string("serviceaccountkey", "", "path serviceacount json") )  func main() {     flag.parse()     mux := http.newservemux()     log.fatalln(http.listenandserve(":9000", trace(*projectid, *serviceaccountkey, mux))) }  func trace(projectid string, keypath string, h http.handler) http.handlerfunc {     client, err := trace.newclient(context.background(), projectid, option.withserviceaccountfile(keypath))     if err != nil {         panic(err)     }     return func(w http.responsewriter, r *http.request) {         s := client.spanfromrequest(r)         defer func() { err := s.finishwait(); spew.dump(err) }()         h.servehttp(w, r)     } }

i'm running as:

$ teststackdrivertrace -projectid ${gcloud_project_id} -serviceaccountkey ${path_to_serviceaccount_json}

and curling produces:

$ curl -s --header "x-cloud-trace-context: 205445aa7843bc8bf206b120001000/0;o=1" localhost:9000  $ (*googleapi.error)(0xc4203a2c80)(googleapi: error 400: request contains invalid argument., badrequest)

what missing?

my traceid 30 bytes long not 32. took example curl https://cloud.google.com/trace/docs/faq 30 bytes.


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