IOS9 WKWebView Access-Control-Allow-Origin

Question

I load local html file on IOS WKWebview using loadFileURL: allowingReadAccessToURL.. But when I send ajax request, it fails.

The error is:

Origin null is not allowed by Access-Control-Allow-Origin.

Can I set some properties to fix this error, like in Android,we can use setAllowUniversalAccessFromFileURLs?

What exactly is ur ajax request? – Peter Mar 14 '16 at 18:34 — Peter, Mar 14 '16 at 18:34

score 6 · Answer 1 · answered Aug 21 '19 at 11:51

6

Have you tried setting it like this?

let config = WKWebViewConfiguration()
config.setValue(true, forKey: "allowUniversalAccessFromFileURLs")

answered Aug 21 '19 at 11:51

cmilhench

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I was getting the null error from image urls referenced in CSS. This fixed it. – weevilgenius Aug 27 '19 at 18:45
I still can't get JavaScript files to load due to CORS errors even with this setting turned on. – Tomáš Hübelbauer May 16 '22 at 17:33
Found a solution to "this class is not key value coding-compliant for the key allowUniversalAccessFromFileURLs", see my comment on https://stackoverflow.com/a/46127440/2715716. – Tomáš Hübelbauer May 16 '22 at 17:42

score 2 · Answer 2 · answered Nov 03 '19 at 17:29

2

When HTML is loaded locally (file URL) with WkWebView below configuration setting to WkWebView worked for me

WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
WKUserContentController *userContentController = [[WKUserContentController alloc] init];

[theConfiguration.preferences setValue:@"TRUE" forKey:@"allowFileAccessFromFileURLs"];
[theConfiguration setValue:@"TRUE" forKey:@"allowUniversalAccessFromFileURLs"];

When you set above setting, origin will be passed as "file://" instead of null

answered Nov 03 '19 at 17:29

Girish Adiga

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This makes the app crash for me with the error "this class is not key value coding-compliant for the key allowUniversalAccessFromFileURLs". – Tomáš Hübelbauer May 16 '22 at 17:29
Found a solution to "this class is not key value coding-compliant for the key allowUniversalAccessFromFileURLs", see my comment on https://stackoverflow.com/a/46127440/2715716. – Tomáš Hübelbauer May 16 '22 at 17:41

score 0 · Answer 3 · edited Aug 09 '16 at 07:46

0

Try using loadRequest instead of loadFileURL. It worked for me :

NSString* path = [[NSBundle mainBundle] pathForResource:@"pageName" ofType:@"html"];
NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]];
[self.webView loadRequest:request];

After that, my query worked fine while I had a 'Cannot make any requests from null' error before.

edited Aug 09 '16 at 07:46

Matt Lacey

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answered May 17 '16 at 09:27

CedricSoubrie

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score 0 · Answer 4 · edited Jun 11 '20 at 07:36

0

if you want to reading from localhtml file, you have to set allowReadAccess

let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let documentsURL = URL(fileURLWithPath: documentsPath, isDirectory: true)
let finalURL = URL(string: htmlurl)
webview.loadFileURL(finalURL!, allowingReadAccessTo: documentsURL)

edited Jun 11 '20 at 07:36

Hun

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answered Mar 11 '18 at 17:33

Janibyek

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score 0 · Answer 5 · answered Oct 13 '18 at 19:38

0

On Chrome, CORS requests won't work from localhost dispite proper CORS headers, just saying.. keep banging my head on that one

answered Oct 13 '18 at 19:38

Pedro Rodrigues

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IOS9 WKWebView Access-Control-Allow-Origin

5 Answers5