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import time
def main(request, response):
# Set mode to 'init' for initial fetch.
mode = 'init'
if 'mode' in request.cookies:
mode = request.cookies['mode'].value
# no-cache itself to ensure the user agent finds a new version for each update.
headers = [('Cache-Control', 'no-cache, must-revalidate'),
('Pragma', 'no-cache')]
content_type = ''
extra_body = ''
if mode == 'init':
# Set a normal mimetype.
# Set cookie value to 'normal' so the next fetch will work in 'normal' mode.
content_type = 'application/javascript'
response.set_cookie('mode', 'normal')
elif mode == 'normal':
# Set a normal mimetype.
# Set cookie value to 'error' so the next fetch will work in 'error' mode.
content_type = 'application/javascript'
response.set_cookie('mode', 'error');
elif mode == 'error':
# Set a disallowed mimetype.
# Set cookie value to 'syntax-error' so the next fetch will work in 'syntax-error' mode.
content_type = 'text/html'
response.set_cookie('mode', 'syntax-error');
elif mode == 'syntax-error':
# Set cookie value to 'throw-install' so the next fetch will work in 'throw-install' mode.
content_type = 'application/javascript'
response.set_cookie('mode', 'throw-install');
extra_body = 'badsyntax(isbad;'
elif mode == 'throw-install':
# Unset and delete cookie to clean up the test setting.
content_type = 'application/javascript'
response.delete_cookie('mode')
extra_body = "addEventListener('install', function(e) { throw new Error('boom'); });"
headers.append(('Content-Type', content_type))
# Return a different script for each access. Use .time() and .clock() for
# best time resolution across different platforms.
return headers, '/* %s %s */ %s' % (time.time(), time.clock(), extra_body)
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