mjb6/flask-upload-issue-arm

Minimal example to show 64kb upload limitation with flask, apache, mod_wsgi on ARM devices

I have a flask application, that supports file upload. It runs on an ARM based debian stable server with apache wsgi. If I upload small files, everything is fine. The problem appears, when I upload files with a file size >64kb. The famous "Bad request - The browser (or proxy) sent a request that this server could not understand." pops up.

Steps to reproduce

• Install in an environment, as described below
• Use the web browser to go to the site
• Upload the file testfiles/1-small-file.gpx -> works
• Upload the file testfiles/3-too-big-file.gpx -> throws Bad request error

Server Config

Server: 32bit armhf device (e.g. Odroid HC1 or Raspberry PI) Distro: debian 9 based

Installed debian packages: sudo apt install python3-pip apache2 libapache2-mod-wsgi-py3

Installed system wide python modules: sudo pip3 install flask peewee

/etc/apache2/sites-available/trackdb.conf:

WSGIScriptAlias /trackdb /var/www/trackdb/flaskapp.wsgi

<Directory /var/www/trackdb/>
        Order allow,deny
        Allow from all
</Directory>
Alias /trackdb/static /var/www/trackdb/static
<Directory /var/www/trackdb/static/>
       Order allow,deny
       Allow from all
</Directory>

Copy the content of this repo to /var/www/trackdb