Modern Python Standard Library Cookbook

How it works...

The application exposes two web pages. One is on the root of the website (through the index function) that only shows a simple form with an upload field.

The other, the upload function, instead receives the uploaded file and shows it back if it's an image or a text file. In all other cases, it will just show the name of the uploaded file.

All that is required to handle the upload in multipart format is to create a cgi.FieldStorage out of it:

form = cgi.FieldStorage(fp=req.environ['wsgi.input'], 
                        environ=req.environ)

The whole body of the POST request is always available in the environ request with the wsgi.input key.

This provides a file-like object that can be read to consume the posted data. Make sure you save aside the ...