Function wcs_handler 

pub async fn wcs_handler(
    configuration: &Configuration,
    workflow: &str,
    request: WcsRequest,
    boundingbox: Option<&str>,
    format: Option<GetCoverageFormat>,
    gridbasecrs: Option<&str>,
    gridoffsets: Option<&str>,
    gridorigin: Option<&str>,
    identifier: Option<&str>,
    identifiers: Option<&str>,
    nodatavalue: Option<f64>,
    resx: Option<f64>,
    resy: Option<f64>,
    service: Option<WcsService>,
    time: Option<&str>,
    version: Option<&str>,
) -> Result<String, Error<WcsHandlerError>>