httpecho

The same thing as jmalloc/echo-server but HTTP requests are echoed as they are received.

Particularly useful for http request smuggling vulnerability research, malformed HTTP requests etc

$ httpecho

# On another shell
$ curl -d "param1=value1&param2=value2" -X POST http://localhost:8888/ -H "Transfer-Encoding: chunked" -H "Content-Length: 8"
POST / HTTP/1.1
Host: localhost:8888
User-Agent: curl/7.58.0
Accept: */*
Transfer-Encoding: chunked
Content-Length: 8
Content-Type: application/x-www-form-urlencoded

1b
param1=value1&param2=value2
0

Usage

Usage of httpecho: echo server accepting malformed HTTP request
  -s, --serve     serve continuously (default: wait for 1 request)
  -t, --timeout   timeout to close connection in millisecond. Needed for closing http request. (default: 500)
  -d, --dump      dump incoming request to a file (default: only print to stdout)
  -p, --port      listening on specific port (default: 8888)
  -v, --verbose	  display request with special characters
  --tls           use TLS encryption for communication
  -h, --help      help information

Install

curl -lO -L https://github.com/ariary/httpecho/releases/latest/download/httpecho
#or
go install github.com/ariary/httpecho