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Sang Tran6,918 Points
'http-server' or 'gulp' is not recognized as an internal or external command, operable program or batch file.
If you're seeing this message even after you globally installed gulp/http-server you might want to try this.. http://stackoverflow.com/questions/24027551/gulp-command-not-found-error-after-installing-gulp
i'm using windows 10, so I got it to work when I Edit "PATH" environment variable and added %APPDATA%\npm