Suppress falsk_compress (Gzip)

pfbuxton · February 6, 2020, 10:35am

Hi,

I have found using apache’s inbuilt gzip compression to be faster than using python’s inbuilt gzip which is called by flask_compress (details of how to use apache DEFLATE below).

My question is how can I turn flask_compress off?
It can be turned off by modifying the following line in dash.py:

github.com

plotly/dash/blob/8ee358826cd4318a3edc52fbf71e0bdda2369984/dash/dash.py#L381


        static_folder=self.config.assets_folder,
        static_url_path="{}{}".format(
            config.routes_pathname_prefix,
            self.config.assets_url_path.lstrip("/"),
        ),
    )
)


if config.compress:
    # gzip
    Compress(self.server)


@self.server.errorhandler(exceptions.PreventUpdate)
def _handle_error(_):
    """Handle a halted callback and return an empty 204 response."""
    return "", 204


prefix = config.routes_pathname_prefix


self.server.before_first_request(self._setup_server)

Looking at the flask_compress documentation there is a key called ‘COMPRESS_LEVEL’ which can be set to zero within app. But I don’t know how to set this key???

github.com

colour-science/flask-compress/blob/7e9cf781e66786943add0f2e47b461cce820bd18/flask_compress.py#L127


            response.headers['Vary'] = '{}, Accept-Encoding'.format(vary)
    else:
        response.headers['Vary'] = 'Accept-Encoding'


    return response


def compress(self, app, response):
    if app.config['COMPRESS_ALGORITHM'] == 'gzip':
        gzip_buffer = BytesIO()
        with GzipFile(mode='wb',
                      compresslevel=app.config['COMPRESS_LEVEL'],
                      fileobj=gzip_buffer) as gzip_file:
            gzip_file.write(response.get_data())
        return gzip_buffer.getvalue()
    elif app.config['COMPRESS_ALGORITHM'] == 'br':
        return brotli.compress(response.get_data())

To set-up apache’s gzip you need to add the following to your .conf file:
SetOutputFilter DEFLATE
SetEnvIfNoCase Request_URI "\.(?:gif|jpe?g|png)$" no-gzip

Thanks,
Peter

pfbuxton · February 11, 2020, 9:50am

Found the answer - when you start the app you can suppress compress by:

app = dash.Dash(__name__,  compress=False)

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Suppress falsk_compress (Gzip)

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