Request header or cookie too large (docker with port-forwarding)

Installation/Setup
1

I setup Kong 2.1.0 using docker. Kong proxy listens on 8080 and 8443 and on host Ubuntu machine I setup iptables to forward 80 and 443 to 8080 and 8443 respectively. I configured the mock service as defined in kong docs below

When i make a simple request on port 80 or 443, I am getting following response

HTTP/1.1 494
Connection: keep-alive
Content-Length: 35
Content-Type: text/plain; charset=utf-8
Date: Fri, 24 Jul 2020 19:53:07 GMT
Server: kong/2.1.0
Via: kong/2.1.0
X-Kong-Proxy-Latency: 21
X-Kong-Response-Latency: 0

Also, in kong logs it appears that it received around 500+ requests. Any help is really appreciated

Thanks in advance

2

How do you configure your mock service? How do you make the request to your service? More details would be helpful to look into the problem.