Could the problem be the httpd daemon?

not sure about httpd itself, but it is likely for other web-servers, like nginx, sitting in the middle, for example https://serverfault.com/questions/820597/nginx-does-not-serve-large-files

In reply to Re^3: CGI::Fast timing out with uploads of large files not small ones by bliako
in thread CGI::Fast timing out with uploads of large files not small ones by mldvx4

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