On 01/27/2010 08:26 AM, Stephen Byrne wrote:
Is there a way to get CometProcessor to work when proxying through
Apache httpd? Here is what I have tried:
I have an HttpServlet implementing CometProcessor.
When I have a Tomcat connector like this:
<Connector port="8912" protocol="HTTP/1.1"
address="192.168.1.30" />
and I connect to it directly, everything works wonderfully - I get
CometEvent.EventType.READ events as I send data from the client.
correct
When I have a Tomcat connector like this:
<Connector port="8911" protocol="HTTP/1.1"
address="127.0.0.1" />
and have Apache httpd proxy requests like this:
RewriteRule ^/path/to/servlet http://localhost:8911/path/to/servlet [P]
I get exactly one CometEvent.EventType.READ event with all of the data
after I finish sending data from the client.
that is cause the proxy buffers the entire request. The Comet technique
messes with the logistics of the HTTP protocol, so this behavior is not
incorrect when proxying.
When I have a Tomcat connector like this:
<Connector port="8909" protocol="AJP/1.3"
address="127.0.0.1" />
AJP connectors dont support Comet, so this wont work.
and have Apache httpd proxy requests like this:
RewriteRule ^/path/to/servlet ajp://localhost:8909/path/to/servlet [P]
I get zero CometEvents and the client gets an HTTP error 405 (Method
Not Allowed). I was hoping that AJP would work so I could try using
ProxyPass with flushpackets=on, but the Apache documentation says that
only works with AJP.
If I use Http11NioConnector instead of HTTP/1.1 and try to proxy with
Apache, I get the same results as if I were using the HTTP/1.1 connector.
My client code (Java) is:
// Direct to Tomcat (HTTP)
//URL url = new URL( "http://server:8912/path/to/servlet"; );
// Apache proxies to Tomcat
URL url = new URL( "http://server/path/to/servlet"; );
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setChunkedStreamingMode( 1 );
connection.setDoOutput( true );
connection.setDoInput( true );
connection.connect();
OutputStream os = connection.getOutputStream();
for ( int i = 0; i < 10; i++ ) {
os.write( 1 );
os.flush();
Thread.sleep( 1000 );
}
os.close();
log.debug( "response:" + connection.getResponseCode() );
log.debug( "response:" + connection.getResponseMessage() );
connection.disconnect();
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