Open Radar

 
32670611

Xcode-9-beta1 (9M136h): Runtime error on registering a custom https handler

Summary:

Attempting to intercept https requests via WKWebViewConfiguration and WKURLSchemeHandler results in a runtime error, which dramatically reduces the usefulness of this new API.

Steps to Reproduce:

Compile and run this code:

            let conf = WKWebViewConfiguration()
            conf.setURLSchemeHandler(UnilyURLSchemeHandler(), forURLScheme: "https")
            let webView = WKWebView(frame: self.view.bounds, configuration: conf)

Expected Results:

The ability to inspect and override all http and https requests (for example to allow custom offline caching).

Actual Results:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ''https' is a URL scheme that WKWebView handles natively'

Regression:

N/A

Notes:

I will attempt to work around this using find-and-replace on https:// in all source data. But that's really ugly. The API should not be so restrictive and force nasty hacks like this.


iOS Version/Build
iOS 11 Xcode-9-beta1 (9M136h)