Simple HTTP echo server

Sometimes (for example debugging Istio) we need to see what’s received by the HTTP destination. We can achieve it with Python.

#!/usr/bin/python3

import http.server
import socketserver
import json
import signal
import sys
from functools import cached_property
from http.cookies import SimpleCookie
from http.server import BaseHTTPRequestHandler
from urllib.parse import parse_qsl, urlparse

class WebRequestHandler(BaseHTTPRequestHandler):
    @cached_property
    def post_data(self):
        content_length = int(self.headers.get("Content-Length", 0))
        return self.rfile.read(content_length)

    def get_response(self):
        return json.dumps(
            {
                "client": self.address_string(),
                "path": self.path,
                "post_data": self.post_data.decode("utf-8"),
                "headers": self.headers.items()
            }, indent=2
        )

    def do_GET(self):
        self.send_response(200)
        self.send_header("Content-Type", "application/json")
        self.end_headers()
        self.wfile.write(self.get_response().encode("utf-8"))

    def do_POST(self):
        self.do_GET()

def setupHandlers():
    signal.signal(signal.SIGINT, handleSIGINT)
    signal.siginterrupt(signal.SIGINT, False)

def handleSIGINT(sig, frame):
     sys.exit(0)

if __name__ == "__main__":
    setupHandlers()
    with socketserver.TCPServer(("0.0.0.0", 8000), WebRequestHandler) as server:
        server.serve_forever()

FROM ubuntu:latest

RUN apt update && apt install python3 -y
WORKDIR /Destop/DS

COPY echo-service.py ./
CMD ["python3", "./echo-service.py"]
EXPOSE 8000