deploy go api does not send any response - google-app-engine

Question

I've created a Go API and deploy but when i see the logs there is no Println and no response is send to the client
the main:
func main() {
http.HandleFunc("/v1/", handler)
appengine.Main()
}
func handler(w http.ResponseWriter, r *http.Request) {
if r.Method != "GET" {
http.Error(w, "not allowed", http.StatusMethodNotAllowed)
return
}
...
}
the yaml file:
runtime: go
api_version: go1.8
handlers:
- url: /.*
script: _go_app
the url that i'm accessing:
myapp.appspot.com/v1/param
(what is this _go_app?)
the problem is that if i pass a "POST" request the error works just fine, but if i make a valid request the response take forever.
full code: https://goplay.space/#yiIp42FKzzj

Answer 1

In AppEngine you must use the AppEngine logger, passing in the context from the request.
Example from the godoc:
c := appengine.NewContext(r)
query := &log.Query{
AppLogs: true,
Versions: []string{"1"},
}
for results := query.Run(c); ; {
record, err := results.Next()
if err == log.Done {
log.Infof(c, "Done processing results")
break
}
if err != nil {
log.Errorf(c, "Failed to retrieve next log: %v", err)
break
}
log.Infof(c, "Saw record %v", record)
}