"operationId": "read_current_user_users_me_get",
                    "security": [{"OpenIdConnect": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {
                "OpenIdConnect": {
                    "type": "openIdConnect",
                    "openIdConnectUrl": "/openid",

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"APIKeyQuery": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {
                "APIKeyQuery": {"type": "apiKey", "name": "key", "in": "query"}
            }
        },

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"HTTPDigest": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {"HTTPDigest": {"type": "http", "scheme": "digest"}}
        },

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"APIKeyCookie": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {
                "APIKeyCookie": {"type": "apiKey", "name": "key", "in": "cookie"}
            }
        },

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"HTTPBasic": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {"HTTPBasic": {"type": "http", "scheme": "basic"}}
        },

# Dependencies { #dependencies }

**FastAPI** has a very powerful but intuitive **<abbr title="also known as components, resources, providers, services, injectables">Dependency Injection</abbr>** system.

It is designed to be very simple to use, and to make it very easy for any developer to integrate other components with **FastAPI**.

## What is "Dependency Injection" { #what-is-dependency-injection }

import org.apache.maven.api.di.Named;
import org.apache.maven.api.di.Singleton;
import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.cling.invoker.mvnenc.EncryptContext;
import org.codehaus.plexus.components.secdispatcher.SecDispatcher;

import static org.apache.maven.cling.invoker.mvnenc.EncryptInvoker.OK;

/**
 * The "encrypt" goal.
 */
@Singleton
@Named("encrypt")

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"HTTPBase": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {
                "HTTPBase": {
                    "type": "http",
                    "scheme": "Other",
                    "description": "Other Security Scheme",
                }

import org.apache.maven.api.di.Named;
import org.apache.maven.api.di.Singleton;
import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.cling.invoker.mvnenc.EncryptContext;
import org.codehaus.plexus.components.secdispatcher.SecDispatcher;

import static org.apache.maven.cling.invoker.mvnenc.EncryptInvoker.OK;

/**
 * The "diag" goal. It should always run, despite it overrides configured goal support.
 */
@Singleton

                    "operationId": "read_current_user_users_me_get",
                    "security": [{"APIKeyQuery": []}],
                }
            }
        },
        "components": {
            "securitySchemes": {
                "APIKeyQuery": {"type": "apiKey", "name": "key", "in": "query"}
            }
        },