On 20.05.2009 10:52, Imner, Andreas wrote: > Hi all > > I'm setting up a website using Apache webserver 2.2.11 / mod_jk 1.2.28 > (Windows Server 2000) that connects to two > backend Apache Tomcat 6.0.18 server (Windows Server 2003) with load > balancing. > The webserver also uses mod_proxy to forward some requests to an IIS5 server > running on the same server but on a > different port. > The IIS5 hosts an Episerver 3 installation. > > To speed things up, Apache webserver is serving the /images folder used by > Episerver using an Alias directive > > Alias /images "E:/Inetpub/EPiServer3/root/images" > <Directory "E:/Inetpub/EPiServer3/root/images"> > Order deny,allow > Allow from all > </Directory> > > For mod_jk, the uriworkermap.properties -file specifies that all requests to > /images/... should be sent to > Apache Tomcat since the webapp contains a lot of images with that path > > /images/*=wlb > > > Is there some way to achieve any of the following behaviours?: > > 1. A request for /images/logo.jpg is processed by Apache webserver (This > file is located on the Apache webserver, in > E:/Inetpub/EPiServer3/root/images) > 2. Mod_jk forwards the request to an Apache Tomcat server which returns a > 404 since logo.jpg does not exist > on the server > 3. Apache webserver detects this 404 response and fetches logo.jpg from > E:/Inetpub/EPiServer3/root/images and returns it > > Alternative > > 1. Same as above > 2. Apache webserver returns logo.jpg from E:/Inetpub/EPiServer3/root/images > (3. In the case that logo.jpg is not found in > E:/Inetpub/EPiServer3/root/images, an attempt is made to send the request to > the Apache Tomcat server using mod_jk) > > I have done some research and came accross the mod_jk option > ForwardDirectories but it doesnt seem to handle any of the above > scenarios? It seems more related to directory indexing?! (I'm quite new with > Apache Webserver / Apache Tomcat :-) ) > > Thank you for your attention!
mod_rewrite has a builtin "-f" flag for "does file exist". You can use it to implement solution 2. 1) Use mod_rewrite to deliver from disk if file exists 2) use mod_rewrite to set the environment variable JK_WORKER_NAME to the name of the jk worker you want to handle the request in case the file does not exist. Also set the mod_rewrite PT (pass through) flag in this case. 3) Do not use an overlapping JkMount. If there is no JkMount for a request and JK_WORKER_NAME is set, the worker name will be taken from the variable. The solution is not easy to understand for administrators, and it is hard to debug, because you would have to know what was in the file system at which time to understand what was going on for some request in the past. To set it up correctly and debug your setup, use a log file for mod_rewrite with a high log level. Firs check independently how the "-f" in mod_rewrite works, then see how you can use the JK_WORKER_NAME environment variable and PT, then combine things. Have fun. Rainer --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
