How to send a referer request in a url for a webView

For which API-level do you need that function?

Since API Level 8 there is a second loadUrl function:

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

With the extraHeaders you should be able to send a referrer.

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EDIT:

Here is a complete working example:

  String url = "http://www.targetserver.tld/";

  Map<String, String> extraHeaders = new HashMap<String, String>();
  extraHeaders.put("Referer", "http://www.referer.tld/login.html");

  WebView wv;
  wv = (WebView) findViewById(R.id.webview);
  wv.loadUrl(url, extraHeaders);