Python Language
Webserver-Gateway-Schnittstelle (WSGI)

Parameter

Serverobjekt (Methode)

Unser Serverobjekt erhält einen 'application'-Parameter, bei dem es sich um ein beliebiges aufrufbares Anwendungsobjekt handeln kann (siehe andere Beispiele). Es schreibt zuerst die Header und dann den Datenbestand, den unsere Anwendung an die Systemstandardausgabe zurückgibt.

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()'