Sample Local Proxy Server With Cors

'''
Sampled from:
   https://gist.github.com/mkows/cd2122f427ea722bf41aa169ef762001

Usage:
   python server-cors
'''
import http.server as httpserver

class CORSHTTPRequestHandler(httpserver.SimpleHTTPRequestHandler):
   def send_head(self):
       """Common code for GET and HEAD commands.
       This sends the response code and MIME headers.
       Return value is either a file object (which has to be copied
       to the outputfile by the caller unless the command was HEAD,
       and must be closed by the caller under all circumstances), or
       None, in which case the caller has nothing further to do.
       """
       path = self.translate_path(self.path)
       f = None
       if os.path.isdir(path):
           if not self.path.endswith('/'):
               # redirect browser - doing basically what apache does
               self.send_response(301)
               self.send_header("Location", self.path + "/")
               self.end_headers()
               return None
           for index in "index.html", "index.htm":
               index = os.path.join(path, index)
               if os.path.exists(index):
                   path = index
                   break
           else:
               return self.list_directory(path)
       ctype = self.guess_type(path)
       try:
           # Always read in binary mode. Opening files in text mode may cause
           # newline translations, making the actual size of the content
           # transmitted *less* than the content-length!
           f = open(path, 'rb')
       except IOError:
           self.send_error(404, "File not found")
           return None
       self.send_response(200)
       self.send_header("Content-type", ctype)
       fs = os.fstat(f.fileno())
       self.send_header("Content-Length", str(fs[6]))
       self.send_header("Last-Modified", self.date_time_string(fs.st_mtime))
       self.send_header("Access-Control-Allow-Origin", "*")
       self.end_headers()
       return f


if __name__ == "__main__":
   import os
   import socketserver
   
   import sys
   PORT = int(sys.argv[1]) if len(sys.argv) > 1 else 8000

   handler = CORSHTTPRequestHandler

   httpd = socketserver.TCPServer(("", PORT), handler)

   print(f"serving at port {PORT}")
   httpd.serve_forever()