Python Language
Web Server Gateway Interface (WSGI)

parameters

Serverobject (methode)

Ons serverobject krijgt een 'applicatie'-parameter die elk opvraagbaar applicatie-object kan zijn (zie andere voorbeelden). Het schrijft eerst de headers, dan de body van gegevens die door onze applicatie worden geretourneerd naar de standaarduitvoer van het systeem.

import os, sys    

def run(application):
    environ['wsgi.input']        = sys.stdin
    environ['wsgi.errors']       = sys.stderr

    headers_set = []
    headers_sent = []

    def write (data):
        """ 
        Writes header data from 'start_response()' as well as body data from 'response' 
        to system standard output. 
        """
        if not headers_set:
            raise AssertionError("write() before start_response()")

        elif not headers_sent:
            status, response_headers = headers_sent[:] = headers_set
            sys.stdout.write('Status: %s\r\n' % status)
            for header in response_headers:
                sys.stdout.write('%s: %s\r\n' % header)
            sys.stdout.write('\r\n')

        sys.stdout.write(data)
        sys.stdout.flush()

    def start_response(status, response_headers):
        """ Sets headers for the response returned by this server."""
        if headers_set:
            raise AssertionError("Headers already set!")

        headers_set[:] = [status, response_headers]
        return write

    # This is the most important piece of the 'server object'
    # Our result will be generated by the 'application' given to this method as a parameter
    result = application(environ, start_response)
    try:
        for data in result:
            if data:
                write(data)          # Body isn't empty send its data to 'write()'
        if not headers_sent:
            write('')                # Body is empty, send empty string to 'write()'