title: php generated images not showing in webview
body: <p>I have an android app with a webview.
  Within the webview i have some php generated images (GDLIB)</p>
  
  <pre><code>&lt;!-- Show a php generated image from GDLIB --&gt;
  &lt;img src='graphs/graph.php'&gt;
  
  &lt;?
  // Graph.php
  $src = imagecreatefrompng('mapStatus.png');
  $dstC = imagecreatefromgif('pointClosed.gif');
  $text_color=ImageColorAllocate($src,255,255,255);
  imagecopymerge($src,$dstC,22,15,0,0,4,4,95);
  header('Content-type: image/png');
  imagepng($src);
  imagedestroy($src);
  ?&gt;
  </code></pre>
  
  <p>For some reason these images, are not being shown within the webview, while they work fine in a regular browser window.
  Replacing the path with a non-php generated image works fine.</p>
  
  <p>Is there some workaround, so that I may be able to show php generated images in webview ?</p>
  
  <p>EDIT:
  Webview shows a broken image like this:</p>
  
  <p><img src="https://i.stack.imgur.com/R6c6N.png" alt="Webview broken image"></p>
  
  <p>instead of the actual picture that should look like this:</p>
  
  <p><img src="https://i.stack.imgur.com/H4dij.png" alt="Actual picture"></p>
  
  <p>Thank you</p>