Problem: PHP $_POST has no data

Solution: use file_get_contents("php://input"); instead. Has to do with php settings, which sometimes cause HTTP_RAW_POST_DATA to not work !

From the PHP manual:
"""php://input is a read-only stream that allows you to read raw data from the request body. In the case of POST requests, it is preferable to use php://input instead of $HTTP_RAW_POST_DATA as it does not depend on special php.ini directives. Moreover, for those cases where $HTTP_RAW_POST_DATA is not populated by default, it is a potentially less memory intensive alternative to activating always_populate_raw_post_data. php://input is not available with enctype="multipart/form-data"."""

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