WKWebView does not actually follow redirects - objective-c

Question

I have a simple WKWebView in macOS. I'm facing issues with redirection when visiting a page without www that then redirects to the subdomain www.
As far as I could find out I'd simply have to allow the navigation request and the webView should handle everything itself. But the redirect never actually happens. The webView ends up in a redirect loop, calling didReceiveServerRedirectForProvisionalNavigation: over and over again until finally failing with Error Domain=NSURLErrorDomain Code=-1007 "too many HTTP redirects"
Safari, other browsers and clients do indeed succeed, what makes me believe that it's not a server issue.
Also when I enter the address redirected to directly, it does work without any issues.
I implemented the WKNavigationDelegate protocol as follows:
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
if ([navigationAction navigationType] == WKNavigationTypeOther) {
if ([[[[navigationAction request] URL] host] isEqualToString:[[[self webView] URL] host]]) {
decisionHandler(WKNavigationActionPolicyAllow);
NSLog(#"allowed");
return;
}
decisionHandler(WKNavigationActionPolicyCancel);
NSLog(#"cancelled: %#", [navigationAction request]);
}
else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
NSLog(#"provisional navigation started");
}
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation; {
NSLog(#"provisional navigation received redirect");
}
I'm expecting the webView to accept and actually follow the redirect after I answered using WKNavigationActionPolicyAllow.
When I execute a request the following happens:
decidePolicyForNavigationAction: for main domain name
I respond with allow
didStartProvisionalNavigation:
decidePolicyForNavigationAction: for redirect with subdomain
I respond with allow
didReceiveServerRedirectForProvisionalNavigation:
Back to 6.
Do I have to somehow "commit" the redirect or do it manually myself?
Any ideas or did I miss something completely?

Answer 1

Stupid me. Really. Embarrassingly stupid.
My table now has my face embossed.
My original code was cut down for overview until a point where I deleted my issue...
I'm working on a special use case where the host name is not in the URL. I connect to a multi-site web server via it's IP and set the Host header accordingly to get the desired page.
When redirected I copy the request, set the header accordingly and resend the request. Guess what? Responding to a redirect by sending the same Host: header will result in another redirect. Grr.
I'll leave this here for public amusement to a day or two