# Test 1 :::: Without python-daemon (I remove the DaemonContext)
$ curl http://localhost:5000
Hello
# Test 2 :::: With python-daemon - it shows me headers and so on in the BODY of my response
$ curl http://localhost:5000
Test Log Message
HTTP/1.1 200 OK
Content-Type: text/plain
Transfer-Encoding: chunked
Date: Thu, 09 Mar 2023 15:52:04 GMT
Server: Cheroot/9.0.0
5
Hello
0
# Test 3 :::: Commenting out `close_all_open_files(exclude=exclude_fds)` in python-daemon makes it work properly again
$ curl http://localhost:5000
Hello

import os
import signal
import sys
import logging
from daemon import DaemonContext
from cheroot.wsgi import WSGIServer
PIDFILE = "./app.pid"
# This run.py can be any file! - just opening a file causes the issue
with open("./run.py") as f:  # <--- Removing this makes it all work! 
    import logging
    handler = logging.FileHandler('./app.log')
    logging.root.addHandler(handler) # <--- Removing this makes it all work!
def app(environ, start_response):  # WSGI application
    start_response("200 OK", [("Content-Type", "text/plain")])
    logging.warning("Test Log Message")  # <--- Removing this makes it all work!
    return [b"Hello"]
def clean_existing_process(): # Kill older process if pidfile is present
    if os.path.exists(PIDFILE):
        with open(PIDFILE, "r") as pf:
            pid = int(pf.read().strip())
        try:
            os.kill(pid, signal.SIGTERM)
            print(f"Killed process {pid}. Deleting file")
        except OSError as err:
            if "No such process" in str(err):
                print("pidfile exists, but process not running. Deleting file")
            else:
                print(f"Unable to stop process {pid}. Error: {err}")
                sys.exit(1)
        os.remove(PIDFILE)
class Pidfile:
    def __enter__(self):
        pid = os.getpid()
        with open(PIDFILE, "w") as f:
            f.write(f"{pid}\n")
    def __exit__(self):
        if os.path.exists(PIDFILE):
            os.remove(PIDFILE)
def run_server():
    server = WSGIServer(("0.0.0.0", 5000), app)
    server.safe_start()
def main():
    clean_existing_process()
    print("Starting process...")
    with DaemonContext(pidfile=Pidfile(), working_directory=os.path.abspath(".")):
        run_server()
if __name__ == "__main__":
    main()