I was having a problem uploading files to a Database via Java applications in Tomcat. I solved the problem by changing the connectionTimeout Connector configuration attribute to 60000. But I have some questions: 1) Is there a resource that provides more detail for Connector configuration attributes, like connectionTimeout, than the resources I've used (http://tomcat.apache.org/tomcat-5.5-doc/config/http.html and "Apache Tomcat 5, Chopra, et.al.")? 2) Assuming there's a tradeoff in modifying connectionTimeout (and that I might want to go greater than 60000), what do I need to watch out for? 3) Can I specify the behavior of the disableUploadTimeout configuration attribute? Read no further, or, here are the details of the issue, if you're interested: I am running Apache Tomcat v5.5.12 behind an Apache (v2) Reverse Proxy server. I'm also running a SunONE Application Server behind the same RP. Some of the Servlets/Applications on either Tomcat or SunONE have features to upload data into databases. When the data is sufficiently large (about 2.5MB), the upload fails and I get an error: Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /<path>Submit.do. Reason: Error reading from remote server (Embedded image moved to file: pic22348.jpg) Apache/2.0.55 (Unix) Server at j2ee.<test domain>.com Port 80 The RP intercepts any "j2ee" URL and redirects it to the proper server-port (tomcat or SunONE) based on the URI. The error occurs consistently at just over 30sec after initiating the upload. On my RP server, I tried modifying httpd.conf, putting the following into the Location Directive: SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 (this per http://httpd.apache.org/docs/2.0/mod/mod_proxy.html) Didn't work. Also tried putting those lines in the appropriate VirtualHost directive, instead. No good. I tried changing "KeepAliveTimeout 15" to "KeepAliveTimeout 60", no luck there either. References to the error I'm getting (through google and elsewhere) have not been particularly helpful. Finally, I focused on two attributes of the Connector configuration in server.xml: connectionTimeout and disableUploadTimeout. The former was set to 20000 and the latter to "true". Changing connectionTimeout to 0, or even to 60000 solved the problem. Reference http://tomcat.apache.org/tomcat-5.5-doc/config/http.html shows the default value of connectionTimeout is 60000. "Apache Tomcat 5, Chopra, et.al." shows it as either 20000 or 60000 depending on where you look. I assume that means that the value if not explicitly set is 60000, but that the default file explicitly sets it at 20000. The disableUploadTimeout attribute is described on the above website thusly: " This flag allows the servlet container to use a different, longer connection timeout while a servlet is being executed, which in the end allows either the servlet a longer amount of time to complete its execution, or a longer timeout during data upload. If not specified, this attribute is set to "false"." It does not specify whether there is a different timeout attribute that is used, nor how much longer it will wait. Either I overlooked it, or Chopra doesn't mention disableUploadTimeout William J. "Bill" Campillo System Administrator, Senior Professional UNIX System and Web Administration CSC(GIS/Glass House) for Raytheon Missile Systems Tucson, AZ 520.545-6469 (office) 520.247.5892 (mobile) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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