OPTIONS sent before POST in the browser for CORS request

Hi, great superagent!

I use the lib to make requests to HP’s IDOL API. Works great in nodejs but in the browser(build with browserify) it sends an OPTIONS request first before the POST request the app is actually making. This sadly breaks everything because the API throws some error and can’t handle OPTIONS request at all.

the endpoint in question is: https://api.idolondemand.com/1/job anyway send an OPTIONS request and one see the Error.

The questions:

1. Can sending OPTIONS before POST (in browser env) be disabled in superagent somehow?
2. Is this related to CORS, I mean if the request was not CORS would the browser send OPTIONS before POST at all?

Looks like this “issue” is related to #451 because after the failing OPTIONS request the error is the same.

[defunctzombie]

You cannot. If the browser decides to prelight a request you have no choice. The only way your request won’t be preflighted is if it is considered a “Simple” request. See here for simple requests:

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

[fiatjaf]

For anyone with this problem, here’s a fork that does not add application/json unless you ask for it: https://github.com/fiatjaf/superagent-cors