@hook 'after_request' is not working for errors

[mrdc]

Hi,

@hook('after_request') is not working for errors: 404, for example.

@hook('after_request')
def enable_cors():
    response.headers['Access-Control-Allow-Origin'] = '*'

@error(404)
def error404(error):
    return '404'

[defnull]

Fixed in master branch, hard to fix in 0.12 without breaking stuff. The problem is that errors or explicitly returning HTTPResponse will bypass any headers already set in the global response object. This is by design. The after_request hook is called too early in 0.12 (before merging the HTTPResponse back into response).