RateLimitException when concurrentConnectionLimitPerIp is exceeded

[predic8]

When the limit is reached in the browser the user gets just a blank screen and does not know what is going on. Add a error message so he knews whats happening.

In HttpEndpointListener, add a ProblemDetails message to the error message.

				while(true) {
					int currentConnections = connectionCount.get();
					// TODO: if count == -1 -> try to get the counter in a while loop
					if (currentConnections >= concurrentConnectionLimitPerIp) {
						log.warn(constructLogMessage(new StringBuilder(), remoteIp, readUpTo1KbOfDataFrom(socket, new byte[1023])));
						writeRateLimitReachedToSource(socket);
						socket.close();
						connnectionWithinLimit = false;
						break;
					}
					if (connectionCount.compareAndSet(currentConnections, currentConnections + 1))
						break;
				}

[predic8]

To count the connections the clientIP is used. What happens, when Membrane sits behind a loadbalancer and all the clientIps are the same?