26 March 2019
By default Undertow subsystem on Wildfly AS configured to process requests with max-post-size= 10MB. So, in case your request larger than 10MB you will get
java.io.IOException: UT000020: Connection terminated as request was larger than 10485760
To increase this parameter you can edit directly standalone or domain configuration, like
<subsystem xmlns="urn:jboss:domain:undertow:3.1">
<buffer-cache name="default"/>
<server name="default-server">
<http-listener name="default" socket-binding="http" max-post-size="15728640" redirect-socket="https" enable-http2="true"/>
<https-listener name="https" socket-binding="https" max-post-size="15728640" security-realm="SSLRealm"/>
....
or use CLI commands as shown below:
/subsystem=undertow/server=default-server/http-listener=default/:write-attribute(name=max-post-size,value=15728640)
/subsystem=undertow/server=default-server/https-listener=https/:write-attribute(name=max-post-size,value=15728640)
Notice! If you are using Wildfly in domain mode with AJP load balancer, you also may need to change max-post-size for ajp-listener
/subsystem=undertow/server=default-server/ajp-listener=ajp/:write-attribute(name=max-post-size,value=15728640)