Returns true (1) if the underlying POST data includes elements that are
not represented by this cef_post_data_t object (for example, multi-part
file upload data). Modifying cef_post_data_t objects with excluded
elements may result in the request failing.
Returns true (1) if the underlying POST data includes elements that are not represented by this cef_post_data_t object (for example, multi-part file upload data). Modifying cef_post_data_t objects with excluded elements may result in the request failing.