setting http_headers in app.yaml doesn't work [closed] - google-app-engine

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Closed 10 years ago.
I am developing an application with appengine 1.7.0 (python) and I am trying to add custom headers to static directories, via app.yaml, in this way:
- url: /js
static_dir: static/js
http_headers:
X-Test-Http-Headers: yo
The problem is that the http header is not being set, even after restarting the application.
Any suggestions?
EDIT:
it does not work either in development nor in production environments
EDIT 2:
debugging with Charles, the returned headers are these:
HTTP/1.1 200 OK
ETag: "f_-W8g"
Date: Fri, 17 Aug 2012 09:40:10 GMT
Expires: Fri, 17 Aug 2012 09:40:15 GMT
Cache-Control: public, max-age=5
Content-Type: application/x-javascript
Content-Encoding: gzip
Server: Google Frontend
Content-Length: 8876
EDIT 3:
I found the problem. I changed the version and therefore the online version was not the deployed one. Restoring the version number made the deployed version available online, and therefore the headers were added:
HTTP/1.1 200 OK
X-Test-Http-Headers: yo
ETag: "DdNIcQ"
Date: Fri, 17 Aug 2012 10:19:01 GMT
Expires: Fri, 17 Aug 2012 10:19:06 GMT
Cache-Control: public, max-age=5
Content-Type: application/x-javascript
Content-Encoding: gzip
Server: Google Frontend
Content-Length: 8876