When using a ProxyServer over SSL (connect tcp mode), async-http-client will produce a garbled HTTP request. The following code will reproduce the problem:

AsyncHttpClient client = new AsyncHttpClient();
Response response = client.preparePost("https://www.google.com/")
        .setBody(new ByteArrayInputStream("TEST TEST".getBytes("utf-8")))
        .setProxyServer(new ProxyServer("localhost", 8888))
        .execute().get();

System.out.println(response.getResponseBody());

The resulting HTTP request will use the following HTTP request string:

POST https://www.google.com HTTP/1.1

The request string should be:

POST / HTTP/1.1

I've verified that using SSL without proxy, or proxy without SSL, does not cause the problem.

This problem is reproducible in at least 1.6.5, 1.7.4, and 1.7.10.