Chunked HTTP Post Request: Arduino/telnet - c

Question

This is what my chunked POST request looks like. I am trying to send chunks of data from an SD card on the arduino to a server through a chunked POST request. Need chunked as it will allow me to send the data which will not all fit into the arduino's memory at once.
POST /upload HTTP/1.1
User-Agent: Arduino
Host: ooboontoo
Accept: */*
Transfer-Encoding: chunked
25
this is the text, of this file, wooo!
1d
more test, of this file
0
However I am getting an error when the server tries parsing the request:
{"25\r\nthis is the text, of this file, wooo!\r\n"=>nil} Invalid
request: Invalid HTTP format, parsing fails.
I tried reading the chunked requests documentation but it appears there are multiple ways of doing the same thing so I am a bit confused on what is the correct way.
Any advice would be appreciated thanks!
EDIT:
here is the bash code I wrote to output the above request to telnet
run with: ./testit.sh | telnet
#! /bin/bash
#testit.sh
#Arduino Telnet HTTP POST tests
header="POST /upload HTTP/1.1\n"
header+="User-Agent: Arduino\n"
header+="Host: localhost 3000\n"
header+="Accept: */*\n"
header+="Transfer-Encoding: chunked\n"
thisfile="this is the text, of this file"
thisfilelen=${#thisfile}
printf -v hexlen '%x' $thisfilelen
thisfile2="more test, of this file"
thisfilelen2=${#thisfile2}
printf -v hexlen2 '%x' $thisfilelen2
end="0"
echo "open localhost 3000"
sleep 2
echo -e $header
echo -e $hexlen
echo -e $thisfile
echo -e $hexlen2
echo -e $thisfile2
echo -e $end
sleep 2