def dsshttp(coord, imsize):
    """
    Generate URL for DSS

    Args:
        coord (SkyCoord):
        imsize (Angle or Quantity):
            image size

    Returns:
        str:  URL

    """
    # https://archive.stsci.edu/cgi-bin/dss_search?v=poss2ukstu_red&r=00:42:44.35&d=+41:16:08.6&e=J2000&h=15.0&w=15.0&f=gif&c=none&fov=NONE&v3=

    Equinox = 'J2000'
    dss = 'poss2ukstu_red'
    url = "http://archive.stsci.edu/cgi-bin/dss_search?"
    url += "v=" + dss + '&r=' + str(coord.ra.value) + '&d=' + str(coord.dec.value)
    url += "&e=" + Equinox
    url += '&h=' + str(imsize) + "&w=" + str(imsize)
    url += "&f=gif"
    url += "&c=none"
    url += "&fov=NONE"
    url += "&v3="

    return url