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Selenium automates browsers. That's it! What you do with that power is entirely up to you.

There is a newer version: 4.26.0

// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.openqa.selenium.netty.server;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.openqa.selenium.internal.Require;
import org.openqa.selenium.remote.ErrorFilter;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

class SeleniumHandler extends SimpleChannelInboundHandler {

  private static final ExecutorService EXECUTOR = Executors.newCachedThreadPool();
  private final HttpHandler seleniumHandler;

  public SeleniumHandler(HttpHandler seleniumHandler) {
    super(HttpRequest.class);
    this.seleniumHandler = Require.nonNull("HTTP handler", seleniumHandler).with(new ErrorFilter());
  }

  @Override
  protected void channelRead0(ChannelHandlerContext ctx, HttpRequest msg) {
    EXECUTOR.submit(
        () -> {
          HttpResponse res = seleniumHandler.execute(msg);
          ctx.writeAndFlush(res);
        });
  }
}