javascript - Uploading documents to CouchDB in pure JS -

i'm writing game in web browser, , i'd make highscores list. i'd save highscores users can compete, i've created database in cloudant (couchdb) plan upload & download scores.

function uploadhighscores() {   var req = new xmlhttprequest();   req.open('put', 'http://reverse-snake.cloudant.com/highscores/highscores', true); // method, url, async   req.onload = function() { // asynchronous callback.     console.log(req.responsetext);     console.log("scores uploaded");   }   req.setrequestheader('content-type', 'application/json');   console.log("sending scores...");    req.send("{\"_id\": \"highscores\", \"_rev\": \"6-f29fd233a21c65e3f4a7485f36c46ae4\", \"data\":{\"scores\":[999, 999, 999, 999, 999], \"times\":[[59, 59, 999], [59, 59, 999], [59, 59, 999], [59, 59, 999], [59, 59, 999]]}}"); } 

this fails error:
xmlhttprequest cannot load http://reverse-snake.cloudant.com/highscores/highscores. response preflight invalid (redirect)

i've tried doing request curl:

curl http://reverse-snake.cloudant.com/highscores/highscores -x put -d "{\"_id\": \"highscores\", \"_rev\": \"6-f29fd233a21c65e3f4a7485f36c46ae4\", \"data\":{\"scores\":[999, 999, 999, 999, 999], \"times\":[[59, 59, 999], [59, 59, 999], [59, 59, 999], [59, 59, 999], [59, 59, 999]]}}" 

and succeeds. missing?

edit: per request, log of failed http request: http://pastebin.com/d97kwpm1

the answer painfully simple. couchdb (and cloudant) require secure network access. revealed network logs:

get requests went http://... , replied redirect; lead https://...

put requests went http://... , replied redirect; lead failure.

the change needs made on line 2, changing method. setting request headers not required.