"""Source code taken and improvements from the article
"Understanding Python WSGI with Examples" by Edd Mann at
https://eddmann.com/posts/understanding-python-wsgi-with-examples/
"""
from urllib.parse import parse_qs
# Server IP
HOST_NAME = "127.0.0.1"
# Server port
PORT_NUMBER = 8080
# Form HTML
form = b"""
Hello User!
\n"""
def application(environ, start_response):
html_document = form
if environ["REQUEST_METHOD"] == "POST":
try:
request_body_size = int(environ.get("CONTENT_LENGTH", 0))
except (ValueError):
request_body_size = 0
# Read the request body
request_body = environ["wsgi.input"].read(request_body_size)
post = parse_qs(request_body.decode("utf-8"))
name = post.get("name", ["World"])[0]
html_document = b"Hello, " + bytes(name, "utf-8") + b"!"
# Start the response
start_response("200 OK", [("Content-Type", "text/html; charset=utf-8")])
return [html_document]
def run():
"""Run WSGI Server"""
server = None
try:
from wsgiref.simple_server import make_server
# Instantiate the server
server = make_server(
HOST_NAME, # The host name
PORT_NUMBER, # A port number where to wait for the request
application, # The application object name, in this case a function
)
print(
f" WSGI Server running on http://{HOST_NAME}:{PORT_NUMBER}/ use to stop."
)
server.serve_forever()
except KeyboardInterrupt:
print(" entered, stopping WSGI Server...")
if server:
server.socket.close()
if __name__ == "__main__":
"""Starting WSGI server"""
run()
else:
print(
"This script should be run directly and not imported as a module.\n"
"Please execute it using 'python wsgi_hello_world_post_request.py'."
)