Hi, Can you help with a hint for this scenario: * If Apache is used as an http reverse proxy, * if it relays a response from a backend server to a client, * if the response is in HTTP/1.1 chunked transfer encoding, * and if the response consists of many small chunks, * then the proxy buffers the small chunks and pass them on in big chunks. How can one instruct Apache to pass chunks on without delay and buffering and rechunking? Cheers, Klaus --- Background: The question might be related to Bug #18157 for Apache httpd-1.3: Proxy Buffering Disrupts Staged Response Delivery. That bug report says that Apache httpd-1.3 ignores ProxyIOBufferSize values less than 8192 bytes. But I use Apache 2.0. The question is unrelated to FAQ F.4.: How can I get my script's output without Apache buffering it?In the scenario, not only the proxy but also the backend server is an Apache server. The small chunks from the backend server comprise progress information from a slow CGI program which is invoked by the backend server. Each chunk should appear immediately in the users browser to tell the user that the CGI program still runs.
When accessing the backend server directly (without a proxy in between), the backend server sends the small chunks one at a time, and they are displayed fine one at a time in Mozilla.
Using tcpdump confirms that the backend sends small chunks to the proxy and that the proxy passes the stream on in big chunks.
The lines SetEnv downgrade-1.0 SetEnv force-response-1.0 makes communication happen in HTTP/1.0, but the proxy still buffers the input from the backend server. The line ProxyIOBufferSize 10 has no effect. For the proxy I have tried Server version: Apache/2.0.54 Server built: Jul 17 2005 12:28:44 and Server version: Apache/2.0.40 Server built: Sep 4 2002 17:20:34 For the backend server I use Server version: Apache/2.0.49 Server built: May 6 2004 07:15:13 --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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