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

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// 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.grid.web;

import static com.google.common.net.MediaType.JSON_UTF_8;
import static org.openqa.selenium.remote.http.Contents.asJson;

import org.openqa.selenium.internal.Require;
import org.openqa.selenium.remote.http.HttpHandler;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

import java.io.UncheckedIOException;

public class ErrorHandler implements HttpHandler {

  private final Throwable throwable;
  private final ErrorCodec errors = ErrorCodec.createDefault();

  public ErrorHandler(Throwable throwable) {
    this.throwable = Require.nonNull("Exception", throwable);
  }

  @Override
  public HttpResponse execute(HttpRequest req) throws UncheckedIOException {
    return new HttpResponse()
      .setHeader("Cache-Control", "none")
      .setHeader("Content-Type", JSON_UTF_8.toString())
      .setStatus(errors.getHttpStatusCode(throwable))
      .setContent(asJson(errors.encode(throwable)));
  }
}