windows wamp or mamp install pecl_http

add these 3 dll files under:

php_raphf.dll

php_propro.dll

php_http.dll

download from under url

http://windows.php.net/downloads/pecl/snaps/propro/1.0.0/

http://windows.php.net/downloads/pecl/releases/http/2.1.4/

http://windows.php.net/downloads/pecl/releases/raphf/1.0.4/

add 3 lines on php.ini

extension=php_raphf.dll
extension=php_propro.dll
extension=php_http.dll

restart apache