server.max-http-header-size=999999999 //953m

-Xms800m -Xmx800m

@RestController("action")
public class HttpHandler {
    @PostMapping("/get")
    public String get() {
        return "get";
    }
}

java.lang.OutOfMemoryError: Java heap space
    at java.nio.HeapByteBuffer.<</span>init>(HeapByteBuffer.java:57) ~[na:1.8.0_152]
    at java.nio.ByteBuffer.allocate(ByteBuffer.java:335) ~[na:1.8.0_152]
    at org.apache.coyote.http11.Http11OutputBuffer.<</span>init>(Http11OutputBuffer.java:107) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
    at org.apache.coyote.http11.Http11Processor.<</span>init>(Http11Processor.java:162) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
    at org.apache.coyote.http11.AbstractHttp11Protocol.createProcessor(AbstractHttp11Protocol.java:990) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_152]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_152]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_152]