Function wms_handler 

pub async fn wms_handler(
    configuration: &Configuration,
    workflow: &str,
    request: WmsRequest,
    bbox: Option<&str>,
    bgcolor: Option<&str>,
    crs: Option<&str>,
    elevation: Option<&str>,
    exceptions: Option<&str>,
    format: Option<&str>,
    height: Option<i32>,
    info_format: Option<&str>,
    layer: Option<&str>,
    layers: Option<&str>,
    query_layers: Option<&str>,
    service: Option<WmsService>,
    sld: Option<&str>,
    sld_body: Option<&str>,
    styles: Option<&str>,
    time: Option<&str>,
    transparent: Option<bool>,
    version: Option<&str>,
    width: Option<i32>,
) -> Result<Response, Error<WmsHandlerError>>