superagent always send data by OPTIONS method

request
    .get(url)
    .end(function (err, res) {
        if (err) {
            console.log(url);
            console.log(err);
        } else {
            var data = res.body;
            callback(data, ctx);
        }
    });

I always get this response

Request Method:OPTIONS Status Code:405 METHOD NOT ALLOWED

[kornelski]

If you’re making request in the browser, the OPTIONS request (called preflight) is done by the browser, not by superagent. Superagent can’t do anything about it. Superagent can’t even detect when it’s happening, and that’s by design. See CORS:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS

When you make a request to another origin (URL with a different host/port/protocol than the page, i.e. generally absolute URL instead of a relative path) you have to deal with CORS. This is mandatory for security, and you’ll most likely need to implement appropriate response on the server. There are exceptions for “simple” GET requests, but POSTing or GET with custom HTTP headers will make browser send another OPTIONS request first to check if these extra features are allowed by the server.

[neekey]

sorry, I doubled checked, not an issue with superagent, just the browser’s CORS strategy.