我们将在主 `FastAPI` 应用中包含该 `APIRouter`，但首先，让我们来看看依赖项和另一个 `APIRouter`。

## 依赖项

我们了解到我们将需要一些在应用程序的好几个地方所使用的依赖项。

因此，我们将它们放在它们自己的 `dependencies` 模块（`app/dependencies.py`）中。

现在我们将使用一个简单的依赖项来读取一个自定义的 `X-Token` 请求首部：

```Python hl_lines="1  4-6" title="app/dependencies.py"
{!../../docs_src/bigger_applications/app/dependencies.py!}
```

/// tip

我们正在使用虚构的请求首部来简化此示例。

def get_graphql_response(
    *,
    settings: Settings,
    query: str,
    after: Union[str, None] = None,
    category_id: Union[str, None] = None,
) -> Dict[str, Any]:
    headers = {"Authorization": f"token {settings.input_token.get_secret_value()}"}
    # category_id is only used by one query, but GraphQL allows unused variables, so
    # keep it here for simplicity
    variables = {"after": after, "category_id": category_id}

func parsePAXRecord(s string) (k, v, r string, err error) {
	// The size field ends at the first space.
	nStr, rest, ok := strings.Cut(s, " ")
	if !ok {
		return "", "", s, ErrHeader
	}

	// Parse the first token as a decimal integer.
	n, perr := strconv.ParseInt(nStr, 10, 0) // Intentionally parse as native int
	if perr != nil || n < 5 || n > int64(len(s)) {
		return "", "", s, ErrHeader
	}

pkg encoding/base32, method (Encoding) WithPadding(int32) *Encoding
pkg encoding/csv, type Reader struct, ReuseRecord bool
pkg encoding/json, func Valid([]uint8) bool
pkg go/ast, type TypeSpec struct, Assign token.Pos
pkg go/types, func SizesFor(string, string) Sizes
pkg go/types, method (*TypeName) IsAlias() bool
pkg hash/fnv, func New128() hash.Hash
pkg hash/fnv, func New128a() hash.Hash

testdata/huffman-zero.wb.expect", "src/compress/flate/testdata/huffman-zero.wb.expect-noinput", "src/compress/flate/testdata/null-long-match.dyn.expect-noinput", "src/compress/flate/testdata/null-long-match.wb.expect-noinput", "src/compress/flate/token.go", "src/compress/flate/writer_test.go", "src/compress/gzip/", "src/compress/gzip/example_test.go", "src/compress/gzip/gunzip.go", "src/compress/gzip/gunzip_test.go", "src/compress/gzip/gzip.go", "src/compress/gzip/gzip_test.go", "src/compress/gz...

	oauth2Token, err := oauth2Config.Exchange(ctx, code)
	if err != nil {
		return "", fmt.Errorf("unable to exchange code for id token: %v", err)
	}

	rawIDToken, ok := oauth2Token.Extra("id_token").(string)
	if !ok {
		return "", fmt.Errorf("id_token not found!")
	}

	// fmt.Printf("TOKEN: %s\n", rawIDToken)
	return rawIDToken, nil
}

// unwrapAll will unwrap the returned error completely.

				if err != nil {
					continue
				}
				jwtClaims, err = auth.ExtractClaims(cred.SessionToken, secretKey)
			}
			if err != nil {
				// skip this cred - session token seems invalid
				continue
			}

			ldapUsername, okUserN := jwtClaims.Lookup(ldapUserN)
			ldapActualDN, okDN := jwtClaims.Lookup(ldapActualUser)
			if !okUserN || !okDN {

						}
					}

					if testCase.resultL.IsTruncated != resultL.IsTruncated {
						// Allow an extra continuation token.
						if !resultL.IsTruncated || len(resultL.Objects) == 0 {
							t.Errorf("Test %d: %s: Expected IsTruncated flag to be %v, but instead found it to be %v", i+1, instanceType, testCase.resultL.IsTruncated, resultL.IsTruncated)

    /** The key of the configuration. e.g. 60 */
    String API_ACCESS_TOKEN_LENGTH = "api.access.token.length";

    /** The key of the configuration. e.g. false */
    String API_ACCESS_TOKEN_REQUIRED = "api.access.token.required";

    /** The key of the configuration. e.g.  */
    String API_ACCESS_TOKEN_REQUEST_PARAMETER = "api.access.token.request.parameter";

    /** The key of the configuration. e.g. Radmin-api */

			if value := env.Get(config.EnvMinIOPrometheusExtraLabels, ""); value != "" {
				os.Setenv("CONSOLE_PROMETHEUS_EXTRA_LABELS", value)
			}
		}
		// Support Prometheus Auth Token
		if value := env.Get(config.EnvMinIOPrometheusAuthToken, ""); value != "" {
			os.Setenv("CONSOLE_PROMETHEUS_AUTH_TOKEN", value)
		}
	}
	// Enable if LDAP is enabled.
	if globalIAMSys.LDAPConfig.Enabled() {