Allow CORS with python simple http server

cors_server.py

import SimpleHTTPServer
class CORSHTTPRequestHandler(SimpleHTTPServer.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

    PORT = 31338

    Handler = CORSHTTPRequestHandler
    #Handler = SimpleHTTPServer.SimpleHTTPRequestHandler

    httpd = SocketServer.TCPServer(("", PORT), Handler)

    print "serving at port", PORT
    httpd.serve_forever()

It works - Thank you.

thank you!

Works perfectly. I've updated line 53 to have the port number passed in dynamically.

#from
PORT = 31338

#to
import sys
PORT = sys.argv[1]

#usage
python server.py 8080

@moo3 for custom port, you probably need:

    PORT = (len(sys.argv) > 1 and int(sys.argv[1])) or 31338

You need an int, and a default in case the user doesn't want to provide one. Thanks @enjalot, you are a gentleman and a scholar!

No, cors is not working

XMLHttpRequest cannot load http://172.28.2.146:7474/db/data/transaction/commit. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://172.28.2.146:31338' is therefore not allowed access. The response had HTTP status code 401.

utils.js:25 XMLHttpRequest cannot load http://www.york.ac.uk/teaching/cws/wws/webpage1.html. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:31338' is therefore not allowed access.

This is not working for me .. still receiving error "has been blocked from loading by Cross-Origin Resource Sharing policy: No 'Access-Control-Allow-origin' header is present on the requested resource."

Worked like a charm for me, no issues at all. Thanks for posting it.

Work like a charm, thank you enjalot.

works, thanks enjalot

Thanks for your efforts to help other Enjalot. For some of you who say that it does not work, please check that you have all the necessary headers and they are set correctly. I had to replace the following line

    self.send_header("Content-type", ctype)

with

    if '.json' in self.path:
        self.send_header("Content-type", "application/json")
    else:
        self.send_header("Content-type", ctype)

as I was using this program to send JSON data, but the output was coming as octet-stream, instead of "application/json", so, I managed to make it work by making the above change. Hope it helps someone else.

I am running a Python3-Django application on Linux webserver http://192.168.0.200:8000/, and want to get a resource from a windows webserver http://192.168.0.210/xyz. But I get the following Error

XMLHttpRequest cannot load http://192.168.0.210/xyz/File/music.wav. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://192.168.0.200:8000' is therefore not allowed access

Thanks

Ported over to Python 3: https://gist.github.com/mkows/cd2122f427ea722bf41aa169ef762001

Thanks :)