Keep getting "not an App Engine context" though I'm using appengine context

[Erik Lyngved]

Hi, I'm not sure what I'm doing wrong here. I'm using appengine.NewContext(r) to make a new context, yet when I try to call blobstore.BlobKeyForFile with the context it panics with "not an App Engine context". It doesn't work with dev_appserver.py nor when deploying as an app engine service. Does someone know what I can try out?

I should note that I'm a golang noob; I just installed it via homebrew today, so not sure if there is something I have to do in my environment.

package main


import (
 "fmt"
 "log"
 "net/http"
  "encoding/json"


  "google.golang.org/appengine"
  "google.golang.org/appengine/blobstore"
)


type Image struct {
  Bucket string
  Path string
}


func main() {
 http.HandleFunc("/serveurl", handle)
 log.Print("Listening on port 8080")
 log.Fatal(http.ListenAndServe(":8080", nil))
}


func handle(w http.ResponseWriter, r *http.Request) {
 ctx := appengine.NewContext(r)
  image := Image{}
  err := json.NewDecoder(r.Body).Decode(&image)
  if err != nil{
    panic(err)
  }


  fullPath := fmt.Sprintf("/gs/%s", image.Bucket, image.Path)
  fmt.Fprint(w, fullPath)


  key, err := blobstore.BlobKeyForFile(ctx, fullPath)
  if err != nil {
    panic(err)
  }
  fmt.Fprint(w, key)
}

[Steven Buss]

Currently, on App Engine Standard, you need to call `appengine.Main()` instead of `http.ListenAndServe`:

func main() {

http.HandleFunc("/serveurl", handle)

appengine.Main()

}

Try that and give it another shot

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