response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/users/me": {
                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/users/me": {
                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/portal": {
                "get": {
                    "summary": "Get Portal",
                    "operationId": "get_portal_portal_get",
                    "parameters": [
                        {

import okio.FileSystem
import okio.GzipSource
import okio.Path
import okio.Path.Companion.toPath
import okio.buffer

/**
 * A database of public suffixes provided by [publicsuffix.org][publicsuffix_org].
 *
 * [publicsuffix_org]: https://publicsuffix.org/
 */
class PublicSuffixDatabase internal constructor(
  val path: Path = PUBLIC_SUFFIX_RESOURCE,
  val fileSystem: FileSystem = FileSystem.RESOURCES,
) {

```

////

`Field` 的工作方式和 `Query`、`Path`、`Body` 相同，参数也相同。

/// note | "技术细节"

实际上，`Query`、`Path` 都是 `Params` 的子类，而 `Params` 类又是 Pydantic 中 `FieldInfo` 的子类。

Pydantic 的 `Field` 返回也是 `FieldInfo` 的类实例。

`Body` 直接返回的也是 `FieldInfo` 的子类的对象。后文还会介绍一些 `Body` 的子类。

注意，从 `fastapi` 导入的 `Query`、`Path` 等对象实际上都是返回特殊类的函数。

///

/// tip | "提示"

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/": {
                "get": {
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "responses": {

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/": {
                "get": {
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "responses": {

    /** The key of the message: Included Paths For Crawling */
    public static final String LABELS_included_paths = "{labels.included_paths}";

    /** The key of the message: Excluded Paths For Crawling */
    public static final String LABELS_excluded_paths = "{labels.excluded_paths}";

    /** The key of the message: Included Paths For Indexing */

   */
  @Test
  fun literalHeaderFieldWithoutIndexingIndexedName() {
    val headerBlock = headerEntries(":path", "/sample/path")
    bytesIn.writeByte(0x04) // == Literal not indexed ==
    // Indexed name (idx = 4) -> :path
    bytesIn.writeByte(0x0c) // Literal value (len = 12)
    bytesIn.writeUtf8("/sample/path")
    hpackWriter!!.writeHeaders(headerBlock)
    assertThat(bytesOut).isEqualTo(bytesIn)

    // (Still done).
    assertThat(secondResponseCode.get()).isEqualTo(200)
  }

  private fun buildRequestThread(
    path: String,
    responseCode: AtomicInteger,
  ): Thread {
    return Thread {
      val url = mockWebServer.url(path).toUrl()
      val conn: HttpURLConnection
      try {
        conn = url.openConnection() as HttpURLConnection