cors: Missing origin error

Guys, please, I’m all out of ideas. Nothing is working.

The basic issue is the fact that requests get denied because it says that Access-Control-Allow-Origin header is missing. Problem is that everything worked fine until it didn’t for whatever reason. Some requests make it through, some just get ignored.

Here’s my configuration to start with:

	corsHandler := cors.New(cors.Options{
		AllowCredentials: true,
		AllowOriginFunc:  func(origin string) bool { return true },
		AllowedMethods:   []string{"GET", "POST", "PUT", "HEAD", "OPTIONS"},
		AllowedHeaders:   AllowedHeaders,
		Debug:            true,
	})

Whenever we receive a request in production, I get the following error: [cors] 2020/03/02 11:55:06 Actual request no headers added: missing origin

If I log the origin in the AllowOriginFunc function, the origin is present.

The request itself is a basic GET method request using JS fetch:

await fetch(new Request('<my url>', {
  method: 'GET',
  headers: {
   Accept: 'application/json',
  },
}))