server_appengine.html

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layout: default
title: enable cross-origin resource sharing
---

	<div class="container">
		<section>
		<h1>CORS on App Engine</h1>

			<p>
				For Python-based applications in Google <a href="http://code.google.com/appengine/">App Engine</a>, the <code>self.response.headers.add_header()</code> method can be used, such as:
			</p>
			<pre class="code">class CORSEnabledHandler(webapp.RequestHandler):
  def get(self):
    self.response.headers.add_header("Access-Control-Allow-Origin", "*")
    self.response.headers['Content-Type'] = 'text/csv'
    self.response.out.write(self.dump_csv())</pre>

			<p>
				For Java-based applications, use <code>resp.addHeader()</code>:
			</p>
			<pre class="code">public void doGet(HttpServletRequest req, HttpServletResponse resp) {
  resp.addHeader("Access-Control-Allow-Origin", "*");
  resp.addHeader("Content-Type", "text/csv");
  resp.getWriter().append(csvString);
}</pre>
                        
                        <p>
                        	And for Go-based applications, use <code>w.Header().Add()</code>:
                        </p>
                        <pre class="code">func doGet(w http.ResponseWriter, r *http.Request) {
  w.Header().Add("Access-Control-Allow-Origin", "*")
  w.Header().Add("Content-Type", "text/csv")
  fmt.Fprintf(w, csvData)
}</pre>
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