oschaaf commented on issue #1657: ngx_pagespeed breaks updating WP by caching POST requests URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1657#issuecomment-506989398 I haven't got around to seeing if I can reproduce it yet; but you could try disallowing affected url paths to see if that resolves the caching you experienced: https://www.modpagespeed.com/doc/restricting_urls#disallow Regardless, it may be difficult, but there definitely is wisdom in @jmarantz reply. Because what we learned here is that when sending these cache-control headers in response to POST requests, one risks that something on the internet may listen to them. And cache the response. That could cause hard to debug issues with a select amount of unfortunate site-visitors, even though you can no longer observe it with the current setup.
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