[BASH] HTTP Server Responder

webserv.sh

#!/bin/bash

SERVER_PORT="${1:-8080}"

function handleRequest(){
	# $METHOD = GET|POST
	# $FULL_REQUEST = /query/url/complete?with=params
	# $REQUEST = /query/url/complete

	# render query parameters as QUERY_* environment variables
  for p in ${QUERY//&/ };do kvp=( ${p/=/ } ); k=${kvp[0]};v=${kvp[1]};eval "QUERY_$k"=$v;done

  # Here you can implement your application logic :
	echo "<pre>METHOD : $METHOD<br>REQUEST : $REQUEST<br>QUERY : $QUERY<br></pre>"
	echo "<h1>$QUERY_alla</h1>"
  
  # or delegate to other external script :
  # source myscript.sh
}

echo "Starting server on http://localhost:$SERVER_PORT"

rm -f serv_out_pipe
mkfifo serv_out_pipe
trap "rm -f serv_out_pipe" EXIT

while true
do
  cat serv_out_pipe | nc -l "$SERVER_PORT" > >(
    export FULL_REQUEST=
    export REQUEST=
    export METHOD=
    export QUERY=
    while read -r line
    do
      line=$(echo "$line" | tr -d '\r\n')
      if echo "$line" | grep -qE "^(GET|POST|PUT|DELETE|PATCH)"
      then
      	METHOD=$(echo "$line" | cut -d ' ' -f1)
        FULL_REQUEST=$(echo "$line" | cut -d ' ' -f2)
	      REQUEST=$(echo "$FULL_REQUEST" | cut -d '?' -f1)
        if [[ $FULL_REQUEST =~ [?] ]]; then
	        QUERY=$(echo "$FULL_REQUEST" | cut -d '?' -f2)
		    else
        	QUERY=
        fi
      	echo ">>> $(date) | $METHOD $REQUEST $QUERY"
        # always responding 200 OK for now...
        echo -e "HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nContent-Type: text/html\r\n\r\n$(handleRequest)" > serv_out_pipe
      fi
    done
  )
done