Add custom headers to WebView resource requests - android

Question

I need to add custom headers to EVERY request coming from the WebView. I know loadURL has the parameter for extraHeaders, but those are only applied to the initial request. All subsequent requests do not contain the headers. I have looked at all overrides in WebViewClient, but nothing allows for adding headers to resource requests - onLoadResource(WebView view, String url). Any help would be wonderful.

Thanks, Ray

Answer 1

Try

loadUrl(String url, Map<String, String> extraHeaders) 

For adding headers to resources loading requests, make custom WebViewClient and override:

API 24+: WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) or WebResourceResponse shouldInterceptRequest(WebView view, String url) 

Answer 2

You will need to intercept each request using WebViewClient.shouldInterceptRequest

With each interception, you will need to take the url, make this request yourself, and return the content stream:

WebViewClient wvc = new WebViewClient() {     @Override     public WebResourceResponse shouldInterceptRequest(WebView view, String url) {          try {             DefaultHttpClient client = new DefaultHttpClient();             HttpGet httpGet = new HttpGet(url);             httpGet.setHeader("MY-CUSTOM-HEADER", "header value");             httpGet.setHeader(HttpHeaders.USER_AGENT, "custom user-agent");             HttpResponse httpReponse = client.execute(httpGet);              Header contentType = httpReponse.getEntity().getContentType();             Header encoding = httpReponse.getEntity().getContentEncoding();             InputStream responseInputStream = httpReponse.getEntity().getContent();              String contentTypeValue = null;             String encodingValue = null;             if (contentType != null) {                 contentTypeValue = contentType.getValue();             }             if (encoding != null) {                 encodingValue = encoding.getValue();             }             return new WebResourceResponse(contentTypeValue, encodingValue, responseInputStream);         } catch (ClientProtocolException e) {             //return null to tell WebView we failed to fetch it WebView should try again.             return null;         } catch (IOException e) {              //return null to tell WebView we failed to fetch it WebView should try again.             return null;         }     } }  Webview wv = new WebView(this); wv.setWebViewClient(wvc); 

If your minimum API target is level 21, you can use the new shouldInterceptRequest which gives you additional request information (such as headers) instead of just the URL.