Hummingbird plugin compatibility in Pantheon

Hi Hummingbird plugin support,

First of all, awesome plugin that you have here and we have seen a lot of neat features that you have in the plugin to improve a site’s page speed ratings.

We would like to reach out and explore the possibility of collaborating in making this plugin optimally work in the platform.

We have a couple of points that we need to be clarified:

1) Due to Platform’s architecture where the live site’s writable path is only on wp-content/uploads, we are getting this error:

Warning: mkdir(): Permission denied in /code/wp-content/plugins/wp-hummingbird/core/class-logger.php on line 184 Warning: fopen(/code/wp-content/advanced-cache.php): failed to open stream: Permission denied in /code/wp-content/plugins/wp-hummingbird/core/class-filesystem.php on line 512 Warning: fwrite() expects parameter 1 to be resource, bool given in /code/wp-content/plugins/wp-hummingbird/core/class-filesystem.php on line 513

Any paths that you recommend that need to be writable? Or do you have any settings to override it to wp-content/uploads?

2) We saw that there are settings to override the web server’s settings https://www.screencast.com/t/B53rHjFzduE but unfortunately, it cannot be overridden in Pantheon, is there any way to disable this setting? Is this just setting the header’s max-age? We were wondering if it can be disabled and it can still work with the default cache plugin that we have https://www.ads-software.com/plugins/pantheon-advanced-page-cache/ ?

Thank you in advance!

Carl A.
Pantheon Customer Success Engineering Team