base.py 文件源码

def get_script_name(environ):
    """
    Returns the equivalent of the HTTP request's SCRIPT_NAME environment
    variable. If Apache mod_rewrite has been used, returns what would have been
    the script name prior to any rewriting (so it's the script name as seen
    from the client's perspective), unless the FORCE_SCRIPT_NAME setting is
    set (to anything).
    """
    if settings.FORCE_SCRIPT_NAME is not None:
        return force_text(settings.FORCE_SCRIPT_NAME)

    # If Apache's mod_rewrite had a whack at the URL, Apache set either
    # SCRIPT_URL or REDIRECT_URL to the full resource URL before applying any
    # rewrites. Unfortunately not every Web server (lighttpd!) passes this
    # information through all the time, so FORCE_SCRIPT_NAME, above, is still
    # needed.
    script_url = environ.get('SCRIPT_URL', environ.get('REDIRECT_URL', str('')))
    if script_url:
        script_name = script_url[:-len(environ.get('PATH_INFO', str('')))]
    else:
        script_name = environ.get('SCRIPT_NAME', str(''))
    # Under Python 3, strings in environ are decoded with ISO-8859-1;
    # re-encode to recover the original bytestring provided by the web server.
    if six.PY3:
        script_name = script_name.encode('iso-8859-1')
    # It'd be better to implement URI-to-IRI decoding, see #19508.
    return script_name.decode('utf-8')