VertxWebIssue2295

A small reproduction of vert-x3/vertx-web#2295.

Preconditions

• Java 11 installed
  • tested with Azul Zulu 11 JDK 11.60.19
• Docker installed
  • tested with Docker 20.10.21 (Docker Desktop 4.14.0) on Windows 10 Enterprise 10.0.19044
  • tested with Docker 20.10.21 on RedHat Enterprise Linux 8.7

Execution

The reproduction is implemented as a JUnit test, i.e., in order to execute the reproduction just run the command

./gradlew cleanTest test

The following system properties are supported for parametrization:

• HTTP_SERVER_PORT - The port used by Vert.x HttpServer for listening. The system property is optional and the default value is 9090.
• LOADBALANCER_PORT - The port used by Nginx loadbalancer for listening. The system property is optional and the default value is 9091.
• LOG_ACTIVITY - Enables activity logging. The system property is optional and the default value is false. Beware of enabling activity logging since the test uses payloads > 1MB. The parametrization can be done using the command

./gradlew cleanTest test -DHTTP_SERVER_PORT=9096 -DLOADBALANCER_PORT=9097 -DLOG_ACTIVITY=true

Architecture

The test starts a Vert.x HttpServer listening to 0.0.0.0:${HTTP_SERVER_PORT} and configures a BodyHandler which limits the payload size to 1MB. Additionally it starts a Nginx loadbalancer (Docker container) listening to 0.0.0.0:${LOADBALANCER_PORT} and forwarding all requests to the Vert.x HttpServer. Payloads are limited to 10MB by the Nginx loadbalancer. Afterwards the test creates a Vert.x WebClient and send the following requests to the Nginx loadbalancer:

POST /3             (no payload)
POST /2             (no payload)
POST /1             (no payload)
POST /test          (1024*1024+42 bytes payload)
POST /1             (no payload)
POST /2             (no payload)
POST /3             (no payload)

Finally it stops the Nginx loadbalancer as well as the Vert.x HttpServer again. The whole test is repeated until it fails (1000 times at maximum).