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Windows, Flask and Cherrypy as WSGI server - gzip compression does not work

Ask Time:2019-09-08T01:25:59         Author:TomRavn

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I am running one older app in company, due to internal policy and app needs it must run on Windows7. App is consist from Flask 0.12.4, WSGI server is Cherrypy 17.4.1. I successfully run this app but I would like to switch on GZIP compression, but I am not able to do that. I went through several documentation and code examples but nothing work. App is only for intranet so I can't test it using some online tools.

my cherrypy configuration:

import os
import cherrypy
from machines import app

path   = os.path.abspath(os.path.dirname(__file__))
config = {
  'global' : {
    'server.socket_host' : '',
    'server.socket_port' : 5000,
    'server.thread_pool' : 10,
    'log.error_file': './log/cherry_error.log',
    'environment': 'production',
  '/static' : {
    'tools.gzip.on'       : True,
    'tools.staticdir.on'  : True,
    'tools.staticdir.dir' : os.path.join(path, 'static'),
    'tools.gzip.mime_types': ['text/*', 'application/*'],

if __name__ == '__main__':    
    cherrypy.tree.graft(app.wsgi_app, '/')

I have tested served files using firefox and chrome developers tools, but it claim no GZIP compression.

Using curl is seems to be same:

curl --head --compressed
HTTP/1.1 200 OK
Content-Length: 68506
Content-Type: text/css; charset=utf-8
Last-Modified: Sat, 07 Sep 2019 14:55:52 GMT
Cache-Control: public, max-age=43200
Expires: Sun, 08 Sep 2019 04:54:20 GMT
ETag: "1567868152.63-68506-1294405540"
Date: Sat, 07 Sep 2019 16:54:20 GMT
Accept-Ranges: bytes

True is I can live without that, but I am really curious what is wrong here. If somebody can advice me I would be really grateful.

Author:TomRavn,eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article:https://stackoverflow.com/questions/57835957/windows-flask-and-cherrypy-as-wsgi-server-gzip-compression-does-not-work