pub unsafe extern "C" fn esp_http_client_set_post_field(
    client: *mut esp_http_client,
    data: *const u8,
    len: i32,
) -> i32Expand description
@brief      Set post data, this function must be called before esp_http_client_perform.
Note: The data parameter passed to this function is a pointer and this function will not copy the data
@param[in] client The esp_http_client handle @param[in] data post data pointer @param[in] len post length
@return
- ESP_OK
 - ESP_FAIL