error in process filter: Wrong type argument: char-or-string-p, nil

[linevych]

I'm tying to shorten url with goo-url-shorten, but it returns me following errors:

Contacting host: www.googleapis.com:443
error in process filter: goo-callback: Wrong type argument: char-or-string-p, nil
error in process filter: Wrong type argument: char-or-string-p, nil
"my-api-key"

I've already try to use server and browser API keys — same result.

• GNU Emacs 24.4.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.5)
  of 2015-03-07 on trouble, modified by Debian
• url-shortener 20150805

[linevych]

Sorry it was my fault. I've tried to send request using curl and it returns me error:

curl https://www.googleapis.com/urlshortener/v1/url\?key\=myprojectkey \
  -H 'Content-Type: application/json' \
  -d '{"longUrl": "http://www.google.com/"}'          
{
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "accessNotConfigured",
    "message": "Access Not Configured. URL Shortener API has not been used in project my_project_id before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/urlshortener/overview?project=my_project_id then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.",
    "extendedHelp": "https://console.developers.google.com/apis/api/urlshortener/overview?project=my_project_id"
   }
  ],
  "code": 403,
  "message": "Access Not Configured. URL Shortener API has not been used in project my_project_id before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/urlshortener/overview?project=my_project_id then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry."
 }

So I just enable access for it as mentioned in the manual.

[yuyang0]

When I write this package, providing an api key for goo.gl is optional, now things seem changed.