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what configuration needs to be tweaked, and where does it live, in order to increase the maximum allowed post size?
909
For particularly large models it is possible to run out of memory since the Java Virtual Machine (JVM) used by Apache Tomcat sets the maximum heap size to only 64 MB by default.
maxPostSize. The maximum size in bytes of the POST which will be handled by the container FORM URL parameter parsing. The limit can be disabled by setting this attribute to a value less than zero. If not specified, this attribute is set to 2097152 (2 megabytes).
To improve performance, Tomcat is configured by default to cache static resources. However, the size of the cache must be configured to be large enough to provide performance savings. To tune Tomcat's cache settings, find the Context directive (in server. xml or context.
maxHttpHeaderSize. The maximum size of the request and response HTTP header, specified in bytes. If not specified, this attribute is set to 8192 (8 KB). maxKeepAliveRequests. The maximum number of HTTP requests which can be pipelined until the connection is closed by the server.
Apache Tomcat by default sets a limit on the maximum size of HTTP POST requests it accepts. In Tomcat 5, this limit is set to 2 MB. When you try to upload files larger than 2 MB, this error can occur.
The solution is to reconfigure Tomcat to accept larger POST requests, either by increasing the limit, or by disabling it. This can be done by editing [TOMCAT_DIR]/conf/server.xml. Set the Tomcat configuration parameter maxPostSize for the HTTPConnector to a larger value (in bytes) to increase the limit. Setting it to 0 in will disable the size check. See the Tomcat Configuration Reference for more information.
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It will be for others persons, I see you are coupling Apache HTTP and Tomcat (tomcat / mod_jk), in this case edit the Coyote/JK2 AJP 1.3 Connector the same way you do it for the standard connector (Coyote HTTP/1.1), because the AJP1.3 Connector is where Tomcat receive data.
<!-- Define a Coyote/JK2 AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
enableLookups="false" redirectPort="8443" debug="0"
protocol="AJP/1.3" maxPostSize="0"/>
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