Editing Web Server Gateway Interface (section)

== WSGI middleware ==
A WSGI middleware component is a Python callable that is itself a WSGI application, but may handle requests by delegating to other WSGI applications. These applications can themselves be WSGI middleware components.<ref name=":1">{{Cite web|url=https://www.python.org/dev/peps/pep-3333/#middleware-components-that-play-both-sides|title=PEP 3333 -- Python Web Server Gateway Interface v1.0.1|website=Python.org|language=en|access-date=2018-04-04}}</ref>

A middleware component can perform such functions as:<ref name=":1" />
* Routing a request to different application objects based on the target [[Uniform Resource Locator|URL]], after changing the [[environment variables]] accordingly.
* Allowing multiple applications or frameworks to run side-by-side in the same [[process (computing)|process]]
* [[Load balancing (computing)|Load balancing]] and remote processing, by forwarding requests and responses over a [[computer network|network]]
* Performing content post-processing, such as applying [[XSLT]] stylesheets