---

# (DD34) Business Logic — Example.basicAuth() [19 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `io.github.biezhi.java11.http.Example` |
| Layer | Utility |
| Module | `http` (Package: `io.github.biezhi.java11.http`) |

## 1. Role

### Example.basicAuth()

This method demonstrates a complete HTTP Basic Authentication request flow using the Java 11 `HttpClient` API. It constructs an HTTP client with an embedded authenticator, supplies a fixed username and password, issues a GET request to `https://labs.consol.de`, and prints the returned status code and response body to standard output. From a business perspective, it acts as a sample integration utility for validating authenticated connectivity to a remote HTTP endpoint rather than performing application-domain persistence or mutation.

The method follows a simple request/response orchestration pattern: configure client credentials, build the request, send the request, and display the result. It does not branch into multiple business service categories, but it does encapsulate the authentication concern by providing credentials through a custom `Authenticator`. In the broader system, this method is a standalone demonstration or test harness for HTTP client behavior, likely used as a reference example for other network calls in the `http` package.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["basicAuth()"])
    C1["Create HttpClient builder"]
    A1["Set authenticator with username and password"]
    A2["Build HttpClient"]
    R1["Create GET request for https://labs.consol.de"]
    A3["Build HttpRequest"]
    R2["Send request with string body handler"]
    D1["Print response status code"]
    D2["Print response body"]
    END_NODE(["Return / Next"])
    START --> C1
    C1 --> A1
    A1 --> A2
    A2 --> R1
    R1 --> A3
    A3 --> R2
    R2 --> D1
    D1 --> D2
    D2 --> END_NODE
```

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | - |

External state read by the method:
- Fixed authentication credentials embedded in the anonymous `Authenticator` implementation: username `username` and password `password`.
- Target endpoint URI `https://labs.consol.de`.
- Standard output stream via `System.out.println(...)`.

## 4. CRUD Operations / Called Services

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| R | `HttpClient.send()` | - | HTTP endpoint `https://labs.consol.de` | Sends an authenticated GET request and retrieves the remote HTTP response as a string payload. |
| R | `HttpResponse.statusCode()` | - | HTTP response metadata | Reads the returned HTTP status for operational verification. |
| R | `HttpResponse.body()` | - | HTTP response body | Reads the response content returned by the remote endpoint. |

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to This Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Standalone utility entry | `Example.basicAuth` | `HttpClient.send() [R] https://labs.consol.de` |

## 6. Per-Branch Detail Blocks

**Block 1** — [SEQUENCE] `(method entry)` (L133)

> Starts the authentication demo by preparing an HTTP client capable of handling Basic Auth credentials.

| # | Type | Code |
|---|------|------|
| 1 | SET | `HttpClient client = HttpClient.newBuilder()`; // begin client construction |
| 2 | EXEC | `.authenticator(new Authenticator() { ... })`; // attach credential provider |
| 3 | EXEC | `getPasswordAuthentication()`; // callback used by the client for credentials |
| 4 | SET | `new PasswordAuthentication("username", "password".toCharArray())`; // supply fixed login identity |
| 5 | EXEC | `.build()`; // finalize HTTP client |

**Block 2** — [SEQUENCE] `(request construction)` (L140)

> Builds a GET request targeting the remote laboratory endpoint.

| # | Type | Code |
|---|------|------|
| 1 | SET | `HttpRequest request = HttpRequest.newBuilder()`; // begin request builder |
| 2 | EXEC | `.uri(new URI("https://labs.consol.de"))`; // define the destination endpoint |
| 3 | EXEC | `.GET()`; // set HTTP method to GET |
| 4 | EXEC | `.build()`; // finalize the request |

**Block 3** — [SEQUENCE] `(send and display response)` (L146)

> Executes the outbound HTTP call and prints the returned operational details for verification.

| # | Type | Code |
|---|------|------|
| 1 | SET | `HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString())`; // send authenticated request and decode as text |
| 2 | EXEC | `System.out.println(response.statusCode())`; // print HTTP status code |
| 3 | EXEC | `System.out.println(response.body())`; // print response payload |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `basicAuth` | Method | Demonstration method that performs an authenticated HTTP GET request using Basic Authentication credentials. |
| `HttpClient` | Technical term | Java 11 HTTP client used to send outbound requests. |
| `Authenticator` | Technical term | Callback that supplies credentials when the remote server requests authentication. |
| `PasswordAuthentication` | Technical term | Java credential container holding a username and password pair. |
| `HttpRequest` | Technical term | Immutable HTTP request definition containing the target URI and method. |
| `HttpResponse` | Technical term | Container for the server response, including status and body. |
| Basic Authentication | Acronym / protocol | HTTP authentication scheme that sends a username and password to access a protected resource. |
| URI | Acronym | Uniform Resource Identifier — the address of the remote HTTP endpoint. |
| GET | HTTP method | Read-only request method used to retrieve content from a server. |
| `labs.consol.de` | External endpoint | Remote site used as the target of the authentication example. |
| `System.out.println` | Technical term | Console output used to display the HTTP response for validation. |