High performance python3 single color service, can work as WMS service mock.

wmscolor.py

#!/usr/bin/env python

import os
import http.server
import socketserver
from urllib.parse import urlsplit, parse_qs
from PIL import Image


class wmsHandler(http.server.BaseHTTPRequestHandler):
    # Handler for the GET requests
    def do_GET(self):
        url = urlsplit(self.path)
        query = parse_qs(url.query)
        if 'height' not in query or 'width' not in query:
            self.send_response(404, 'Wrong params')
            self.end_headers();
            return

        image = Image.new('RGB', (int(query.get('width')[0]), int(query.get('height')[0])), (255, 255, 255))
        format = query.get('format', ['jpeg'])[0]
        format = format.lower().split('/', 2).pop()

        self.send_response(200)
        self.send_header('Content-type', 'image/' + format)
        self.end_headers()
        # Send the html message
        image.save(self.wfile, format)
        return

try:
    # Create a web server and define the handler to manage the
    # incoming request
    port = int(os.environ.get('PORT', 8080))
    server = socketserver.ThreadingTCPServer(('', port), wmsHandler)
    print('Started WMS color server on port', port)
    # Wait forever for incoming htto requests
    server.serve_forever()

except KeyboardInterrupt:
    print('shutting down server')
    server.shutdown()