How to use the webserver.launch function in webserver

def test_ogr_opaif_init():

    gdaltest.opaif_drv = ogr.GetDriverByName('OAPIF')
    if gdaltest.opaif_drv is None:
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = \
        webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

def ogr_wfs_fake_wfs_server():
    if gdaltest.wfs_drv is None:
        return 'skip'

    (process, port) = webserver.launch()
    if port == 0:
        return 'skip'

    gdal.SetConfigOption('OGR_WFS_LOAD_MULTIPLE_LAYER_DEFN', 'NO')
    ds = ogr.Open("WFS:http://127.0.0.1:%d/fakewfs" % port)
    gdal.SetConfigOption('OGR_WFS_LOAD_MULTIPLE_LAYER_DEFN', None)
    if ds is None:
        gdaltest.post_reason('did not managed to open WFS datastore')
        webserver.server_stop(process, port)
        return 'fail'

    lyr = ds.GetLayerByName('rijkswegen')
    if lyr.GetName() != 'rijkswegen':
        gdaltest.post_reason('did not get expected layer name')
        print(lyr.GetName())
        webserver.server_stop(process, port)

def test_ogr_gmlas_xlink_resolver():

    if ogr.GetDriverByName('GMLAS') is None:
        pytest.skip()

    drv = gdal.GetDriverByName('HTTP')
    if drv is None:
        pytest.skip()

    (webserver_process, webserver_port) = webserver.launch(handler=GMLASHTTPHandler)
    if webserver_port == 0:
        pytest.skip()

    gdal.FileFromMemBuffer('/vsimem/ogr_gmlas_xlink_resolver.xsd',
                           """




  
    
        

def test_vsiswift_start_webserver():

    gdaltest.webserver_process = None
    gdaltest.webserver_port = 0

    if not gdaltest.built_against_curl():
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

def test_mbtiles_start_webserver():

    if gdaltest.mbtiles_drv is None:
        pytest.skip()

    if gdal.GetDriverByName('HTTP') is None:
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

def test_ogr_mvt_http_start():

    gdaltest.webserver_process = None
    gdaltest.webserver_port = 0

    if not gdaltest.built_against_curl():
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

def test_vsigs_start_webserver():

    gdaltest.webserver_process = None
    gdaltest.webserver_port = 0

    if not gdaltest.built_against_curl():
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

    gdal.SetConfigOption('CPL_GS_ENDPOINT', 'http://127.0.0.1:%d/' % gdaltest.webserver_port)
    gdal.SetConfigOption('GS_SECRET_ACCESS_KEY', 'GS_SECRET_ACCESS_KEY')
    gdal.SetConfigOption('GS_ACCESS_KEY_ID', 'GS_ACCESS_KEY_ID')

def test_rda_test_presence():

    gdaltest.rda_drv = gdal.GetDriverByName('RDA')

    gdal.SetConfigOption('RDA_CACHE_DIR', '/vsimem/cache_dir')
    gdal.SetConfigOption('GDBX_CONFIG_FILE', '')

    if gdaltest.rda_drv is None:
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()

def test_vsicurl_start_webserver():

    gdaltest.webserver_process = None
    gdaltest.webserver_port = 0

    if not gdaltest.built_against_curl():
        pytest.skip()

    (gdaltest.webserver_process, gdaltest.webserver_port) = webserver.launch(handler=webserver.DispatcherHttpHandler)
    if gdaltest.webserver_port == 0:
        pytest.skip()