README

In one window:

    $ python2.6 /tmp/wsgiexample.py

In another:

    $ curl http://localhost:9977
    POST some text to me.
    $ curl -d 'This is xxx a test.' http://localhost:9977
    I found 3 X(es).

wsgiexample.py

from wsgiref.simple_server import make_server

def count_letter_x(environ, start_response):
	start_response("200 OK", [("Content-Type", "text/plain")])
	if environ["REQUEST_METHOD"] == "POST":
		length = environ["CONTENT_LENGTH"]
		request_body = environ["wsgi.input"].read(int(length))
		num_x_letters = request_body.count("x")
		return ["I found %d X(es).\n" % (num_x_letters,)]
	else:
		return ["POST some text to me.\n"]

server = make_server("", 9977, count_letter_x)
server.serve_forever()