First of all make sure you have granted httpd all security permission and grants: http://wiki.eri.ucsb.edu/sysadm/SELinux#HTTPD
Second: it's possible that a script (php, cgi etc) invokes a httpd legit function that it's blocked by SELinux.
Third: a Whois of the IP Address is often useul to check if the IP Address is in some blacklist.
The strange thing is the context of httpd: "user_u:system_r:bootloader_t:s0" why httpd has bootloader context access? Maybe it's really a kind of attack trying to access boot sector or bootloader or maybe, there's a misconfiguration in httpd or the problem happens at boot time during init (?!?).