How to use CORS?

[minwookH]

I want to call "localhost" from another domain.
How to setting CORS?

[minwookH]

Sorry.
I success after header.

[yvbeek]

@pmpmopm1 Not a problem. If you are using this in a development scenario you can send the following header back to the client:

Access-Control-Allow-Origin: *

If you want to make it a bit fancier, you can create a handler:

public class HTTPCORSHandler: HTTPRequestHandler {
  public func respond(to request: HTTPRequest, nextHandler: HTTPRequest.Handler) throws -> HTTPResponse? {
    let response = try nextHandler(request)

    // Add access control header for GET requests
    if request.method == .GET { 
      response?.headers["Access-Control-Allow-Origin"] = "*"
    }

    return response
  }
}

For increased security you can add additional checks, dig down into the request, and send back different CORS headers for different clients.

[YiYiZheng]

Could you pls show the code how to set the header. Thx

[yvbeek]

@YiYiZheng I've added a section about CORS to the readme:
https://github.com/Building42/Telegraph#http-cross-origin-resource-sharing-cors

If you have a response object, simply set the header with:

response.headers["Access-Control-Allow-Origin"] = "*"