Hi, I'm starting to see more clients making Range requests (iPhone among them) and I'm trying to understand how much work I have to do to support the correct behaviour. I've been investigating Tomcat support for this (although my application will be deployed in different servlet containers; definitely Tomcat 5.0.x, 5.5.x and Weblogic 9.x currently) and comparing my expectations with what I'm seeing.
Exhibit A - requesting content, adding a Range: bytes=0-1499 header to the request. GET /Protocols/rfc2616/rfc2616-sec14.html HTTP/1.1 Host: www.w3.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Range: bytes=0-1499 HTTP/1.x 206 Partial Content Date: Thu, 13 Dec 2007 10:57:39 GMT Server: Apache/2 Last-Modified: Wed, 01 Sep 2004 13:24:52 GMT Etag: "3e3073913b100" Accept-Ranges: bytes Content-Length: 1500 Cache-Control: max-age=21600 Expires: Thu, 13 Dec 2007 16:57:39 GMT P3P: policyref="http://www.w3.org/2001/05/P3P/p3p.xml"; Content-Range: bytes 0-1499/126444 Keep-Alive: timeout=2, max=100 Connection: Keep-Alive Content-Type: text/html; charset=iso-8859-1 That works as expected, being served by Apache 2, returning a 206 response with the partial body being returned. When I request a page via Tomcat locally (requesting the Tomcat user documentation), I get the following: Exhibit B - request to Tomcat 5.0.30 ROOT webapp, adding a Range: bytes=0-1499 header to the request. GET / HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Range: bytes=0-1499 HTTP/1.x 200 OK Content-Type: text/html;charset=ISO-8859-1 Transfer-Encoding: chunked Date: Thu, 13 Dec 2007 11:01:23 GMT Server: Apache-Coyote/1.1 i.e. a 200 response with the full response body. But as part of the same request, the images are retrieved... Exhibit C - related image request, adding a Range: bytes=0-1499 header to the request. GET /tomcat.gif HTTP/1.1 Host: localhost:8080 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11 Accept: image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Referer: http://localhost:8080/ Range: bytes=0-1499 HTTP/1.x 206 Partial Content Etag: W/"1934-1101296588000" Last-Modified: Wed, 24 Nov 2004 11:43:08 GMT Content-Range: bytes 0-1499/1934 Content-Type: image/gif Content-Length: 1500 Date: Thu, 13 Dec 2007 11:01:23 GMT Server: Apache-Coyote/1.1 And these have a 206 response, with a partial response body. I note that the Tomcat 4.0 functional specs talk about Range request support [1], but not about how to ensure that it's enabled for all resources within a webapp. Questions: 1. Why doesn't the page served by the root item get returned as a partial content response? It is a jsp page in the ROOT webapp, which comes as part of the tomcat installation. 2. Why do the images react correctly to the Range request? 3. How can I get my resources to respond correctly to the Range request? Am I missing some configuration thing? I have a mixture of JSP with Struts 1.2 and Spring MVC. I'm thinking that I'll need to find or write a Filter to handle this (particularly as it needs to run on other containers; e.g. Weblogic), but it seems a shame that it isn't part of the HTTP implementation within the container. The related headers that I need to consider include Accept-Range, If-Range and Content-Range. I can take care of setting ETags and Last-Modified headers for my resources, so I just need to ensure that something is handling the Range related functionality at some point. Cheers, James [1] http://tomcat.apache.org/tomcat-4.0-doc/catalina/funcspecs/fs-default.html -- View this message in context: http://www.nabble.com/Range-request-header-%28and-related-headers%29-behaviour-tp14314129p14314129.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
