Hello everyone :)

I would like to use Thrift API directly from a web service with Javascript (not 
NodeJS).
So, in order to try that, I generated a Python HTTP server and a Javascript 
client on a simple HTML page.

But when I try to send a request from my Browser (Google Chrome) to the Python 
server, I have the following error :

OPTIONS http://localhost:9090/ 501 (Unsupported method ('OPTIONS'))
flush @ thrift.js:390
DealerClient.send_getTimestamp @ Dealer.js:638
DealerClient.getTimestamp @ Dealer.js:615
update_timestamp @ index.html:33
onclick @ index.html:14
thrift.js:390 Access to XMLHttpRequest at 'http://localhost:9090/' from origin 
'null' has been blocked by CORS policy: Response to preflight request doesn't 
pass access control check: No 'Access-Control-Allow-Origin' header is present 
on the requested resource.
Uncaught DOMException: Failed to execute 'send' on 'XMLHttpRequest': Failed to 
load 'http://localhost:9090/'.

The entire code with the complete error can be found here: 
https://pastebin.com/LqPUHH3g
It seems the HTTPServer don't know how to deal with the 'OPTIONS' HTTP method 
which is sent before the requested command (which is supposed to be sent by 
POST HTTP method) and doesn't respond with headers to the browser.

So, If one of you have an idea/an example of a working Javascript/Python 
client/server application, it could be nice :)

Regards,
Thibault

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