For example on swallow,
2019/01/15 06:12:16 [error] 92649#100187: *5201399 limiting connections by zone "addr", client: *Client_IP_address*, server: swallow.5ch.net, request: "POST /test/bbs.cgi?guid=ON HTTP/1.1"
2019/01/15 06:12:16 [error] 92652#100327: *5215210 limiting connections by zone "addr", client: *Client_IP_address*, server: swallow.5ch.net, request: "POST /test/bbs.cgi?guid=ON HTTP/1.1"
2019/01/15 06:12:17 [error] 92652#100327: *5215210 limiting connections by zone "addr", client: *Client_IP_address*, server: swallow.5ch.net, request: "POST /test/bbs.cgi?guid=ON HTTP/1.1"
:
:

So you guy posts many time on one time.
Please cool down yourself.