Flask minify after_request handler

minify.py

mods = ((re.compile('[\n\r]'), ''),
        (re.compile(' +'), ' '),)
@app.after_request
def mod_response(response):
    if mods and response.content_type.startswith('text/html;'):
        response_data = response.get_data(as_text=True)
        for before, after in mods:
            if isinstance(before, str):  # it's a string replacement
                response_data = response_data.replace(before, after)
            else:  # it's a re
                response_data = before.sub(after, response_data)
        response.set_data(response_data)
    return response