Created
August 14, 2020 18:48
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Problem with CORS and fetch on same origin. Browser assumes the "same-origin" to be null, but why?
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| #!/usr/bin/env python3 | |
| from http.server import HTTPServer, HTTPStatus, SimpleHTTPRequestHandler, test | |
| import sys | |
| from urllib.parse import urlparse | |
| import os | |
| class TestRequestHandler (SimpleHTTPRequestHandler): | |
| def do_GET(self): | |
| """Serve a GET request.""" | |
| url = urlparse(self.path) | |
| if url.path == '/' or url.path == '/index.html': # index.html | |
| f = self.send_head('text/html') | |
| self.wfile.write('''<!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Test</title> | |
| <script type="text/javascript" src="control.js"></script> | |
| </head> | |
| <body> | |
| </body> | |
| </html>'''.encode('utf-8')) | |
| elif url.path == '/control.js': # control.js will try to fetch the fetch.xml | |
| f = self.send_head('application/javascript') | |
| self.wfile.write('''function init() { | |
| fetch("fetch.xml").then(r => r.text()).then(t => console.log(t)); | |
| } | |
| window.addEventListener("load", init);'''.encode('utf-8')) | |
| elif url.path == '/fetch.xml': # fetch.xml | |
| f = self.send_head('text/xml') | |
| self.wfile.write('''<?xml version="1.0" encoding="UTF-8"?> | |
| <root> | |
| <test>Hi</test> | |
| </root>'''.encode('utf-8')) | |
| def send_head(self, ctype): | |
| self.send_response(HTTPStatus.OK) | |
| self.send_header('Content-Type', ctype) | |
| self.send_header('Access-Control-Allow-Origin', 'http://127.0.0.1:8000') | |
| self.send_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS') | |
| self.send_header('Access-Control-Max-Age', 86400) | |
| self.send_header('Referrer-Policy', 'no-referrer-when-downgrade') | |
| self.send_header('Content-Security-Policy', 'sandbox allow-scripts') | |
| SimpleHTTPRequestHandler.end_headers(self) | |
| if __name__ == '__main__': | |
| test(TestRequestHandler, HTTPServer, port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000) |
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