pub unsafe extern "system" fn WsGetCustomHeader(
    message: *const WS_MESSAGE,
    customheaderdescription: *const WS_ELEMENT_DESCRIPTION,
    repeatingoption: WS_REPEATING_HEADER_OPTION,
    headerindex: u32,
    readoption: WS_READ_OPTION,
    heap: *const WS_HEAP,
    value: *mut c_void,
    valuesize: u32,
    headerattributes: *mut u32,
    error: *const WS_ERROR,
) -> HRESULT