Android WebView "No 'Access-Control-Allow-Origin' header is present on the requested resource"

Question

I'm trying to load a test web page (in my server). Page is:

<!DOCTYPE html>
<html>
<head>
    <title>Test</title>
</head>
<body>

<iframe width="420" height="315" src="http://www.youtube.com/embed/XGSy3_Czz8k?autoplay=1"/>

</body>
</html>

But webView is not loading page. Not even onProgressChanged called after %40-50

Also, this problem occurs all sites that loads js script from url. Including youtube, fb etc.

WebConsole: XMLHttpRequest cannot load https://googleads.g.doubleclick.net/pagead/id. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://www.youtube.com' is therefore not allowed access.

Here my settings

    FrameLayout contentFrame = (FrameLayout) findViewById(R.id.ContentFrame);
    WebView mWebView = new WebView(this);

    mWebView.setWebChromeClient(new WebChromeClient());
    mWebView.setWebViewClient(new WebViewClient());
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setAllowUniversalAccessFromFileURLs(true);
    mWebView.getSettings().setAllowFileAccessFromFileURLs(true);

    mWebView.loadUrl("http://ozgur.dk/browser.html");

    contentFrame.removeAllViews();
    contentFrame.addView(mWebView);

Layout:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    android:id="@+id/ContentFrame"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

Please refer similar question stackoverflow.com/questions/20035101/… and stackoverflow.com/questions/20433655/… — user861594
– user861594, Commented Jun 26, 2016 at 15:23

isstiaung · Accepted Answer · 2016-06-25 20:08:52Z

4

You can solve this by enabling a WebSetting called setAllowUniversalAccessFromFileURLs
This is happening on the Javascript layer.
You can read up about it here : CORS

answered Jun 25, 2016 at 20:08

isstiaung

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Comments

Ozgur · Accepted Answer · 2016-06-25 20:51:46Z

3

+500

Are you sure you are not pausing timers in somewhere? Because this happens when you call mWebView.pauseTimers() when page loading.

answered Jun 25, 2016 at 20:51

Ozgur

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1 Comment

Lazy Over a year ago

Thanks so much, I wasn't aware that I'm pausing timer in other parts of activity.

Edward Alexander · Accepted Answer · 2016-06-25 20:22:19Z

You're trying to do a cross-domain request, which is impossible since it's on a different domain than your page is on.

There is however a workaround that.

Using CORS - tutorial by Monsur Hossain

An example using CORS (By Monsur Hossain):

function createCORSRequest(method, url) {
var xhr = new XMLHttpRequest();
if ("withCredentials" in xhr) {

// Check if the XMLHttpRequest object has a "withCredentials" property.
// "withCredentials" only exists on XMLHTTPRequest2 objects.
xhr.open(method, url, true);

} else if (typeof XDomainRequest != "undefined") {

// Otherwise, check if XDomainRequest.
// XDomainRequest only exists in IE, and is IE's way of making CORS requests.
xhr = new XDomainRequest();
xhr.open(method, url);

} else {

// Otherwise, CORS is not supported by the browser.
xhr = null;

}
return xhr;
}

var xhr = createCORSRequest('GET', url);
if (!xhr) {
throw new Error('CORS not supported');
}

As a side note, if you want to run JavaScript on Android:

Execute JavaScript in Android without WebView - tutorial by Wesley Lin

An example using Rhino (by Wesley Lin):

Object[] params = new Object[] { "javaScriptParam" };

// Every Rhino VM begins with the enter()
// This Context is not Android's Context
Context rhino = Context.enter();

// Turn off optimization to make Rhino Android compatible
rhino.setOptimizationLevel(-1);
try {
Scriptable scope = rhino.initStandardObjects();

// Note the forth argument is 1, which means the JavaScript source has
// been compressed to only one line using something like YUI
rhino.evaluateString(scope, javaScriptCode, "JavaScript", 1, null);

// Get the functionName defined in JavaScriptCode
Object obj = scope.get(functionNameInJavaScriptCode, scope);

if (obj instanceof Function) {
    Function jsFunction = (Function) obj;

    // Call the function with params
    Object jsResult = jsFunction.call(rhino, scope, scope, params);
    // Parse the jsResult object to a String
    String result = Context.toString(jsResult);
}
} finally {
Context.exit();
}

sifr_dot_in · Accepted Answer · 2021-01-17 10:07:04Z

-1

Starting with Android 9 (API level 28), cleartext support is disabled by default.
Better install security certificate on your server.
still
To circumvent add following line in Manifest

<application
        ...
        android:label="@string/app_name"
        android:usesCleartextTraffic="true"
        ...

viola...

answered Jan 17, 2021 at 10:07

sifr_dot_in

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