# Test Client - `TestClient`

You can use the `TestClient` class to test FastAPI applications without creating an actual HTTP and socket connection, just communicating directly with the FastAPI code.

Read more about it in the [FastAPI docs for Testing](https://fastapi.tiangolo.com/tutorial/testing/).

You can import it directly from `fastapi.testclient`:

```python
from fastapi.testclient import TestClient
```

* «type annotations»: «annotations de type»

* «autocomplete»: «autocomplétion»
* «autocompletion»: «autocomplétion»

* «the request» (what the client sends to the server): «la requête»
* «the response» (what the server sends back to the client): «la réponse»

* «the request body»: «le corps de la requête»
* «the response body»: «le corps de la réponse»

* «path operation»: «opération de chemin»

// It does not implement the standard error Unwrap interface for
// better error log messages.
type Error struct {
	Code    int    // The HTTP status code returned to the client
	APICode string // The API error code identifying the error
	Err     string // The error message returned to the client
	Cause   error  // Optional, lower level error cause.
}

func (e Error) Error() string {
	if e.Cause == nil {
		return e.Err
	}

Diese werden zu ihren entsprechenden Werten konvertiert (in diesem Fall Strings), bevor sie zum Client übertragen werden:

{* ../../docs_src/path_params/tutorial005_py39.py hl[18,21,23] *}

In Ihrem Client erhalten Sie eine JSON-Response, wie etwa:

```JSON
{
  "model_name": "alexnet",
  "message": "Deep Learning FTW!"
}
```

			wg.Wait()
			defer xioutil.SafeClose(handlerIn)
			m.handleInbound(c, inbound, handlerIn)
		}(m.inbound)
	}
	// Fill outbound block.
	// Each token represents a message that can be sent to the client without blocking.
	// The client will refill the tokens as they confirm delivery of the messages.
	for range outboundCap {
		m.outBlock <- struct{}{}
	}

	// Handler goroutine.
	var handlerErr atomic.Pointer[RemoteErr]

Diese gibt lediglich eine JSON-<abbr title="Response – Antwort: Daten, die der Server zum anfragenden Client zurücksendet">Response</abbr> zurück, mit dem Ergebnis der Methode `.openapi()` der Anwendung.

Standardmäßig überprüft die Methode `.openapi()` die Eigenschaft `.openapi_schema`, um zu sehen, ob diese Inhalt hat, und gibt diesen zurück.

from fastapi import FastAPI, Request

app = FastAPI()


@app.get("/items/{item_id}")
def read_root(item_id: str, request: Request):
    client_host = request.client.host

# Request Body { #request-body }

When you need to send data from a client (let's say, a browser) to your API, you send it as a **request body**.

A **request** body is data sent by the client to your API. A **response** body is the data your API sends to the client.

	debug                                            bool
	insecure                                         bool
)

func buildS3Client(endpoint, accessKey, secretKey string, insecure bool) (*minio.Client, error) {
	u, err := url.Parse(endpoint)
	if err != nil {
		return nil, err
	}

	secure := strings.EqualFold(u.Scheme, "https")
	transport, err := minio.DefaultTransport(secure)
	if err != nil {

```

### Lambda Target with mTLS authentication

If your lambda target expects mTLS client you can enable it per function target as follows
```
MINIO_LAMBDA_WEBHOOK_ENABLE_function=on MINIO_LAMBDA_WEBHOOK_ENDPOINT_function=http://localhost:5000 MINIO_LAMBDA_WEBHOOK_CLIENT_CERT=client.crt MINIO_LAMBDA_WEBHOOK_CLIENT_KEY=client.key minio server /data &
```

## Create a bucket and upload some data