Python Web Server Gateway Interface (WSGI) is a start response which initiates the beginning of any process in Python. Learn more about this parameter here.
Parameter Details
start_response A function used to process the start
Python Web Server Gateway Interface: Server Object (Method)
Our server object is given an ‘application’ parameter which can be any callable application object (see other examples). It writes first the headers, then the body of data returned by our application to the system standard output.
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()'