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#!/bin/sh
# Simple HTTP Server using Netcat (nc)
#
# Sends a greeting message and the date in the response.
# Info: Relies on the OpenBSD version of Netcat
# GNU netcat may or may not work.
# Creating a FIFO so that the output of nc can be processed and used to determine the input.
# Allows for "passing values back round"
outfifo="/tmp/outfifo"
rm -f "$outfifo"
mkfifo "$outfifo"
# Run forever
while true; do
x="$(date)"
len="$(echo "$x" | wc -c)"
cat "$outfifo" \
| nc -l localhost 1500 \
| while read -r line; do
line=$(echo "$line" | tr -d '\r\n')
echo "< $line"
if echo "$line" | grep -qE '^GET /'; then
# on reading the request line, extract a value from the request path and build the response
name="$(echo $line | sed 's:GET /\([^ ]*\).*:\1:')"
content="Hello $name, the date and time is $(date)."
# Without Content-Length header, connection will not close properly
len="$(echo "$content" | wc -c)"
response="HTTP/1.1 200 OK\nContent-Length: $len\nContent-Type: plain/text\n\n$content"
elif [ -z "$line" ]; then # end of request
# send response once all of the request has been read
echo -e "$response" > "$outfifo"
fi
done
done
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