#! /bin/sh
set -euf
exec sed '
  s/%/%25/g
  s/ /%20/g
  s/!/%21/g
  s/"/%22/g
  s/#/%23/g
  s/\$/%24/g
  s/\&/%26/g
  s/'\''/%27/g
  s/(/%28/g
  s/)/%29/g
  s/\*/%2a/g
  s/+/%2b/g
  s/,/%2c/g
  s/-/%2d/g
  s/\./%2e/g
  s/\//%2f/g
  s/:/%3a/g
  s/;/%3b/g
  s//%3e/g
  s/?/%3f/g
  s/@/%40/g
  s/\[/%5b/g
  s/\\/%5c/g
  s/\]/%5d/g
  s/\^/%5e/g
  s/_/%5f/g
  s/`/%60/g
  s/{/%7b/g
  s/|/%7c/g
  s/}/%7d/g
  s/~/%7e/g
'