FcgidMaxRequestLen, Default значение 131072
httpd.apache.org/mod_fcgid/mod/mod_fcgid.html#fcgi...
Cenos /etc/httpd/conf.d/fcgid.conf или Deb/untu /etc/apache2/mods-available/fcgid.conf можно указать FcgidMaxRequestLen 1073741824 - это 1 GB.
Пример опций
FcgidIdleScanInterval 30
FcgidIdleTimeout 60
FcgidIOTimeout 300
FcgidProcessLifeTime 600
FcgidMinProcessesPerClass 0
FcgidMaxProcessesPerClass 16
FcgidMaxProcesses 256
FcgidMaxRequestLen 536870912
Решено.
AddHandler fcgid-script .fcgi
FcgidConnectTimeout 60
FcgidMaxRequestLen 1073741824