Why is WSGI necessary?
A traditional web server does not understand or have any way to run Python applications.
Therefore the Python community came up with WSGI as a standard interface that modules and containers could implement. WSGI is now the accepted approach for running Python web applications.
As shown in the above diagram, a WSGI server simply invokes a callable object on the WSGI application as defined by the PEP 3333 standard.
Some examples of WSGI servers are: Green Unicorn, uWSGI, mod_wsgi and CherryPy.
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Overview
The WSGI has two sides:
- the server/gateway side. This is often running full web server software such as Apache or Nginx.
- the application/framework side. This is a Python callable, supplied by the Python program or framework.
Between the server and the application, t...
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