"Content-Length:" Header used for uploading/sending.
To unset use -1
@property request_content_length { get {} set {} values { length: int64; } }
int64_t efl_net_dialer_http_request_content_length_get(const Eo *obj); void efl_net_dialer_http_request_content_length_set(Eo *obj, int64_t length);