Access the Http Response Headers in a Webview

Access the http response headers in a WebView?

Neither WebView nor WebViewClient provide methods to do that, Though, you can try to implement that manually. You can do something like this:

private WebView webview;
public void onCreate(Bundle icicle){
    // bla bla bla

    // here you initialize your webview
    webview = new WebView(this);
    webview.setWebViewClient(new YourWebClient());
}

// this will be the webclient that will manage the webview
private class YourWebClient extends WebViewClient{

    // you want to catch when an URL is going to be loaded
    public boolean  shouldOverrideUrlLoading  (WebView  view, String  urlConection){
        // here you will use the url to access the headers.
        // in this case, the Content-Length one
        URL url;
        URLConnection conexion;
        try {
            url = new URL(urlConection);
            conexion = url.openConnection();
            conexion.setConnectTimeout(3000);
            conexion.connect();
            // get the size of the file which is in the header of the request
            int size = conexion.getContentLength();
        }

        // and here, if you want, you can load the page normally
        String htmlContent = "";
        HttpGet httpGet = new HttpGet(urlConection);
        // this receives the response
        HttpResponse response;
        try {
            response = httpClient.execute(httpGet);
            if (response.getStatusLine().getStatusCode() == 200) {
                // la conexion fue establecida, obtener el contenido
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    InputStream inputStream = entity.getContent();
                    htmlContent = convertToString(inputStream);
                }
            }
         } catch (Exception e) {}

         webview.loadData(htmlContent, "text/html", "utf-8");
         return true;
    }

    public String convertToString(InputStream inputStream){
        StringBuffer string = new StringBuffer();
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        String line;
        try {
            while ((line = reader.readLine()) != null) {
                string.append(linea + "\n");
            }
        } catch (IOException e) {}
        return string.toString();
    }
}

I can't test it right now, but that's basically what you could do (it's very crazy though :).

Android WebView - How can I see Headers?

Refer
if you want to get response header,
Access the http response headers in a WebView?

or if you want to attach request header, just use attach map when call webView.loadUrl()
How to load URL with headers in WebView?

Android WebView: Get Response Header HTML

you could get the value by inject a section of js code,here is a simple sample,you could check it.

in the activity :

protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.activity_other);         
        webView = FindViewById<WebView>(Resource.Id.webView1);
        webView.SetWebViewClient(new WebViewClientClass());
        WebSettings websettings = webView.Settings;
        websettings.JavaScriptEnabled = true;
        websettings.DomStorageEnabled = true;

        webView.AddJavascriptInterface(new Foo(this), "Foo");
        webView.LoadUrl("file:///android_asset/demo.html");

    }

  class WebViewClientClass : WebViewClient
    {

        public override void OnPageFinished(WebView view, string url)
        {

            //access to parse < meta name = "viewport" content = "get the value of content" >
            view.LoadUrl("javascript:window.Foo.showSource("
                         + "document.querySelector('meta[name=\"viewport\"]').getAttribute('content')"
                         + ");");
            base.OnPageFinished(view, url);
        }

    }

 class Foo : Java.Lang.Object
  {
     Context context;

     public Foo(Context context)
      {
        this.context = context;
      }
    [JavascriptInterface]
    [Export]
    public void showSource(string source)
    {
        // here you could get the value of meta content
        // in this example,i could get source = "width =device-width,initial-scale=1, maximum-scale=1"
        Log.Error("content", html);

    }
 }

the local html :

<html>
  <head>
    <meta name="viewport" content="width =device-width,initial-scale=1, maximum-scale=1">
  </head>
  <body>
     ...
  </body>
</html>

How to access all HTTP Response Headers

I've found the answer to my own question.

What I have in my code to return all headers is correct. Using HTTPClient.getResponseHeaders() is the correct method for iOS and HTTPClient.getAllResponseHeaders() for Android (no idea why there's two different ways - that could be a question for another day).

The reason I'm not seeing the cookie header is because of a bug in Titanium 1.7.5 (and still exists in 1.8.1). It's not forwarding on the cookie on a 302 redirect.

Jiras on the issues:

• https://jira.appcelerator.org/browse/TIMOB-4537
• https://jira.appcelerator.org/browse/TIMOB-1322

Retrieve HTTP response headers from WKWebview

It looks like you can access the response from the WKNavigationDelegate method webView:decidePolicyFor:decisionHandler:.

Set some object as the WKWebView's navigationDelegate, and add this method:

- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    NSDictionary *headers = ((NSHTTPURLResponse *)navigationResponse.response).allHeaderFields;

    decisionHandler(WKNavigationResponsePolicyAllow);
}

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