Create Link headers for HTTP/2 Server push

README.md

This script creates headers of all files in a given directory to use them for HTTP/2 server push.

Usage: linkheader.sh /mydir

linkheader.sh

#!/bin/sh
# Creates Link headers of all asset files in a directory.
#
# LICENSE: CC0/Public Domain - To the extent possible under law, rugk has waived all copyright and related or neighboring rights to this work. This work is published from: Deutschland.

getfiletype() {
        fileext=${1##*.}
        case $fileext in
                js)
                        echo "script"
                        ;;
                css)
                        echo "stylesheet"
                        ;;
                jpg|jpeg|png|gif)
                        echo "image"
                        ;;
        esac
}

for asset in $1/*; do
        assetfile=$( basename "${asset}" )
        filetype=$( getfiletype "${assetfile}" )
        if [ "${filetype}" != "" ]; then
                echo "Link <$1/${assetfile}>; rel=preload; as=${filetype}"
        fi
done