It seems that the 204 error is fixed upon analyzing/fixing the changes made
at the time the 204 error was occurring.
The cause was the kind of code as below executed in the application's entry
point.
function setEnv($key, $val){ putenv("$key=$val"); $_ENV[$key] = $val;
$_SERVER[$key] = $val;}setEnv(CACHE_DRIVER", "memcached");
We are using Lumen Framework.
This was to switch environment for unittest, but the 204 error stopped
occurring after deleting this.
So far the 204 error was occurring 10 times every 1 minute, but after
deploying this change we are not seeing the error for about 1 hour.
Not sure if this is a GAE/PHP or Lumen Framework specific bug, but
reporting just in case it might be helpful for someone.
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