Undertow read-timeout can close connection unexpectedly before returning response for POST request larger than the default buffer size

1. Configure read-timeout="10000" (10 seconds) on undertow http-listener and ajp-listener <ajp-listener name= "ajp" read-timeout= "10000" socket-binding= "ajp" record-request-start-time= " true " /> <http-listener name= " default " read-timeout= "10000" socket-binding= "http" record-request-start-time= " true " redirect-socket= "https" enable-http2= " true " /> 2. Configure httpd/mod_proxy_ajp for testing AJP part ProxyPass /example/ http: //127.0.0.1:8009/example/ 3. Deploy attached example.war, then send a request to index.jsp with a large POST request data. Send 16KB POST request data to HTTP port with Content-Length $ curl -v http: //127.0.0.1:8080/example/index.jsp -d "test=$(cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 16384)" -H "Expect:" Send 16KB POST request data to HTTP port with chunked encoding $ curl -v http: //127.0.0.1:8080/example/index.jsp -d "test=$(cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 16384)" -H "Expect:" -H "Transfer-Encoding: chunked" Send 8KB POST request data to AJP port through httpd/mod_proxy_ajp $ curl -v http: //127.0.0.1/example/index.jsp -d "test=$(cat /dev/urandom | tr -dc A-Za-z0-9 | head -c 8192)" -H "Expect:" Expected result: The server returns a response for the application after some sleep (11 seconds by default), so curl should receive the response like the following: Hello Start: Fri May 19 19:17:34 JST 2023 End: Fri May 19 19:17:45 JST 2023 Actual result: The server does not return any response, so curl will show the following instead: curl: (52) Empty reply from server — Memo: the following command can generate a random ASCII text with the specified length. So, we utilize this to generate a large dummy POST request data for the curl command: $ cat /dev/urandom | tr -dc A-Za-z0-9 | head -c <bytesize>