Detect if user is using webview for android/iOS or a regular browser

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Detecting browser for iOS devices is different from the Android one. For iOS devices you can do it by checking user agent using JavaScript:

var userAgent = window.navigator.userAgent.toLowerCase(),
    safari = /safari/.test( userAgent ),
    ios = /iphone|ipod|ipad/.test( userAgent );

if( ios ) {
    if ( safari ) {
        //browser
    } else if ( !safari ) {
        //webview
    };
} else {
    //not iOS
};

For Android devices, you need to do it through server side coding to check for a request header.

PHP:

if ($_SERVER['HTTP_X_REQUESTED_WITH'] == "your.app.id") {
    //webview
} else {
    //browser
}

JSP:

if ("your.app.id".equals(req.getHeader("X-Requested-With")) ){
    //webview
} else {
    //browser
}

Ref:detect ipad/iphone webview via javascript

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