{* ../../docs_src/response_model/tutorial001_01_py310.py hl[16,21] *}

FastAPI will use this return type to:

* **Validate** the returned data.
    * If the data is invalid (e.g. you are missing a field), it means that *your* app code is broken, not returning what it should, and it will return a server error instead of returning incorrect data. This way you and your clients can be certain that they will receive the data and the data shape expected.

        private JavadocTagToElementTranslatingHandler(DocBookBuilder nodes, Document document) {
            this.nodes = nodes;
            this.document = document;
            tagToElementMap.put("code", "literal");
        }

        @Override
        public boolean onJavadocTag(String tag, String value) {
            String elementName = tagToElementMap.get(tag);
            if (elementName == null) {

 *   <li>connectTimeout - Connection timeout in milliseconds (default: 10000)</li>
 *   <li>readTimeout - Read timeout in milliseconds (default: 10000)</li>
 * </ul>
 *
 * <p>The client supports URLs in the format: {@code s3://bucket-name/object-path}
 *
 * <p>Features:
 * <ul>
 *   <li>Automatic initialization of AWS S3 client</li>
 *   <li>Support for HEAD and GET operations</li>
 *   <li>Content length validation</li>

                  <project path="$PROJECT_DIR$/build-logic-commons/basics" />
                  <project path="$PROJECT_DIR$/build-logic-commons/build-platform" />
                  <project path="$PROJECT_DIR$/build-logic-commons/code-quality-rules" />
                  <project path="$PROJECT_DIR$/build-logic-commons/gradle-plugin" />
                  <project path="$PROJECT_DIR$/build-logic-commons/module-identity" />

 * normalization process, including setting initial buffer capacity, maximum term sizes,
 * duplicate term removal, and custom space characters.
 *
 * <p>Example usage:
 * <pre>{@code
 * Reader reader = new StringReader("Example text to normalize.");
 * String normalizedText = TextUtil.normalizeText(reader)
 *                                  .initialCapacity(5000)

///

/// warning | Achtung

这并非偶然，整个 **FastAPI** 框架都是围绕这种思路精心设计的。

并且，在 FastAPI 的设计阶段，我们就已经进行了全面测试，以确保 FastAPI 可以获得所有编辑器的支持。

我们还改进了 Pydantic，让它也支持这些功能。

虽然上面的截图取自 <a href="https://code.visualstudio.com" class="external-link" target="_blank">Visual Studio Code</a>。

但 <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a> 和大多数 Python 编辑器也支持同样的功能：

<img src="/img/tutorial/body/image05.png">

  </description>
  <dependencies>
    <dependency>
      <groupId>org.jspecify</groupId>
      <artifactId>jspecify</artifactId>
    </dependency>
    <dependency>
      <groupId>com.google.code.findbugs</groupId>
      <artifactId>jsr305</artifactId>
      <version>${jsr305.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>com.google.errorprone</groupId>

import com.google.caliper.BeforeExperiment;
import com.google.caliper.Benchmark;
import org.jspecify.annotations.NullUnmarked;

/**
 * Benchmarks for the non-rounding methods of {@code LongMath}.
 *
 * @author Louis Wasserman
 */
@NullUnmarked
public class LongMathBenchmark {
  private static final int[] exponents = new int[ARRAY_SIZE];

      for (Present<V> element : values) {
        result.add(element != null ? element.value : null);
      }
      return unmodifiableList(result);
    }
  }

  /** The result of a successful {@code Future}. */
  private static final class Present<V extends @Nullable Object> {
    @ParametricNullness final V value;

    Present(@ParametricNullness V value) {
      this.value = value;
    }
  }