Installation

wsgi_cache can be installed as a Python egg, using easy_install:

$ easy_install wsgi_cache

Configuration

Configuration of wsgi_cache will often be done using Paste Deploy. In this situation, it can be configured as a filter:

[app:main]
use = egg:my_wsgi_app#app
filter-with = cache

[filter:cache]
use = egg:wsgi_cache#middleware
cache_dir = ./cache

The cache_dir is the only required configuration parameter, and will be interpreted as relative to global_conf['here'].

wsgi_cache also supports three additional configuration parameters:

• content_type

  Specifies the content type used when serving cached resources; see Limitations below for details on this. By default this is set to text/html.

• cache_paths

  A comma separated list of paths, starting with a /, that specifies the paths to cache. If specified, only requests to paths starting with one of these strings will be cached.

• directory_index

  When accessing a path that ends in a / (like /monkeys/), wsgi_cache needs to create a special filename. By default this is __index.html. So by default, caching the page /monkeys/ saves to the file ${path_to_cache}/monkeys/__index.html; if we set directory_index to dir_x it would save to ${path_to_cache}/monkeys/dirx.

Behavior

When a request comes in, wsgi_cache examines the path to determine if it should be cached. Requests with a querystring are not cached, regardless of the use of cache_paths. If the request is supposed to be cached, wsgi_cache looks for the page in the cache and serves that copy, if available. If unavailable, the request is passed to the application and the result is saved and returned.

Note that in many situations, you’ll want to exploit wsgi_cache’s on disk cache layout to serve the cached version directly using your front end web server (ie, Apache with mod_rewrite).

Development

wsgi_cache may be developed using buildout

$ python bootstrap.py
$ ./bin/buildout

This will install any dependencies, as well as create a wrapper python script that can be used to run a shell with wsgi_cache on the Python path.

$ python setup.py nosetests

$ ./bin/python setup.py nosetests

Limitations

• wsgi_cache only stores the response body in order to allow serving of the cached files by a faster, static webserver. As such, it can only return a single content-type at this point.

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