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As soon as I enable FPC in Magento 2.4.2, I am getting a upstream sent too big header while reading response header from upstream error when I try searching. It does not happen for all search terms, but for most.

My shop is running on nginx so I tried adding this to the nginx.conf:

fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;
proxy_buffer_size   128k;
proxy_buffers   4 256k;
proxy_busy_buffers_size   256k;

Did not help a bit. Any ideas how to solve this?

Thanks!

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1 Answer 1

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3

I find this is normally down to the CSP headers. If you don’t need the module disable it using

bin/magento module:disable Magento_Csp

And you should be back in business.

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2
  • Thanks, did not help in my case :(
    – user4095519
    Commented Sep 2, 2021 at 6:00
  • it works, thanks!
    – wpdaniel
    Commented Feb 2, 2023 at 18:27

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