---

# (DD05) Business Logic — Example.proxy() [14 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.proxy()

This method demonstrates how the application sends an outbound HTTP request through an explicitly configured proxy endpoint. It constructs a local `HttpClient` instance, binds that client to a proxy server at `127.0.0.1:1080`, and then uses the client to call `https://www.google.com` with a simple GET request. Business-wise, the method is an integration example for network routing rather than a domain transaction: it verifies that the runtime can reach an external service through a proxy layer and that the response can be read successfully.

The method follows a builder-and-delegation pattern. It first builds the client with network configuration, then builds the request, then delegates the actual transmission to `client.send(...)`, and finally delegates output handling to standard console logging. There are no conditional branches, loops, or alternate service categories in this method; the entire flow is a single happy-path proxy call. In the larger system, this method serves as a technical sample inside the `Example` utility class and appears intended to illustrate Java 11 HTTP client proxy configuration for developers or operators.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["proxy()"])
    B1["Create HttpClient builder"]
    B2["Configure proxy selector with 127.0.0.1:1080"]
    B3["Build HttpClient"]
    B4["Create HTTP request for https://www.google.com"]
    B5["Set request method to GET"]
    B6["Build request"]
    B7["Send request via client"]
    B8["Get status code from response"]
    B9["Print status code"]
    B10["Get response body"]
    B11["Print response body"]
    END(["Return void"])
    START --> B1
    B1 --> B2
    B2 --> B3
    B3 --> B4
    B4 --> B5
    B5 --> B6
    B6 --> B7
    B7 --> B8
    B8 --> B9
    B9 --> B10
    B10 --> B11
    B11 --> END
```

**CRITICAL — Constant Resolution:**
No project-specific constant files were identified for this method. The proxy host and port are hard-coded as `127.0.0.1` and `1080`, and the request URI is hard-coded as `https://www.google.com`.

## 3. Parameter Analysis

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

Instance fields and external state read by this method:
- No instance fields are accessed.
- The method reads only local literals and the runtime networking environment.
- The configured proxy endpoint `127.0.0.1:1080` must be reachable for the outbound call to succeed.
- The external target `https://www.google.com` must be reachable from the proxy path.

## 4. CRUD Operations / Called Services

### Pre-computed evidence from code analysis graph:

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.proxy` | Example | - | Calls `proxy` in `Example` |

Analyze all method calls within this method and classify each as a CRUD operation.
Use the pre-computed evidence above. If SC Code or Entity/DB is missing, try to infer from:
- The **SC Code** (Service Component code, e.g., `EKK0361A010SC`, `EKK1081D010CBS`) — look at the class name of the called method or its containing class.
- The **Entity/DB tables** — search for table name constants (often `KK_T_*` pattern), SQL references, or entity names in the called method’s source code.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| R | `HttpClient.send` | JDK | External HTTP response | Sends a GET request through the configured proxy and reads the remote response |
| R | `HttpResponse.statusCode` | JDK | HTTP response metadata | Reads the response status code returned by the remote server |
| R | `HttpResponse.body` | JDK | HTTP response body | Reads the response payload as a string |

## 5. Dependency Trace



Trace who calls this method and what this method ultimately calls.
Use the pre-computed evidence and caller search results from Step 2 above.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Utility caller within `Example` documentation scope | `Example.proxy` | `HttpClient.send [R] External HTTP response` |

**Instructions:**
- Use `search_files` with pattern `**/*.java` and content_pattern `proxy` to find all callers.
- For each caller, identify if it's a Screen (class name contains `KKSV*`, `Screen*`), Batch, Controller, or CBS.
- Build the full call chain from the entry point to this method.
- Each row = one unique entry point. Show ALL found callers (up to 15 rows).
- The Terminal column lists ALL CRUD endpoints reached FROM this method.
- Format terminal as `methodName [C/R/U/D] EntityOrTableName`
- If a caller class name matches `KKSV\d{4}`, format as `Screen:KKSVxxxx`.

## 6. Per-Branch Detail Blocks

Analyze the method's control flow block by block. Analyze ALL nesting levels — no depth limit.

> Each branch of the control flow is displayed as a hierarchical block structure.

**Format to follow:**

**Block 1** — [SEQUENCE] `(linear execution)` (L117)

> The method executes as a single straight-through sequence with no branching.

| # | Type | Code |
|---|------|------|
| 1 | SET | `HttpClient client = HttpClient.newBuilder()`; // start builder creation |
| 2 | EXEC | `client.proxy(ProxySelector.of(new InetSocketAddress("127.0.0.1", 1080)))`; // configure proxy endpoint |
| 3 | EXEC | `client.build()`; // finalize HttpClient configuration |
| 4 | SET | `HttpRequest request = HttpRequest.newBuilder()`; // start request builder |
| 5 | EXEC | `request.uri(new URI("https://www.google.com"))`; // set destination URI |
| 6 | EXEC | `request.GET()`; // configure GET operation |
| 7 | EXEC | `request.build()`; // finalize request |
| 8 | CALL | `client.send(request, HttpResponse.BodyHandlers.ofString())`; // send outbound request |
| 9 | EXEC | `response.statusCode()`; // read status code |
| 10 | EXEC | `System.out.println(response.statusCode())`; // print status code |
| 11 | EXEC | `response.body()`; // read response body |
| 12 | EXEC | `System.out.println(response.body())`; // print response body |
| 13 | RETURN | `return;` // implicit void return |

## 7. Glossary

Define ALL domain-specific terms, Japanese field names, and technical abbreviations used in this method. This section makes the document accessible to Business Analysts (BA) who may not be familiar with the codebase's naming conventions.

**Include at minimum:**
- Every Japanese-named field (e.g., `svc_kei_ucwk_no`, `odr_naiyo_cd`) with its business meaning
- Every acronym (e.g., SOD, JOKEN, INFO, FTTH) with its expansion
- Every service type referenced (e.g., FTTH, Mail, ENUM) with its domain description

**Format:**
| Term | Type | Business Meaning |
|------|------|------------------|
| `proxy` | Technical term | HTTP client routing mechanism that forwards outbound requests through an intermediary server |
| `HttpClient` | Technical term | Java 11 client used to send outbound HTTP requests |
| `ProxySelector` | Technical term | Java networking component that chooses which proxy should be used for a request |
| `InetSocketAddress` | Technical term | Host-and-port network address used to identify the proxy server |
| `GET` | HTTP method | Request method used to retrieve data from a remote endpoint |
| `statusCode` | Technical term | Numeric HTTP result code returned by the server |
| `body` | Technical term | Response payload returned by the remote endpoint |
| `Example` | Class | Demonstration class that contains sample Java 11 HTTP client scenarios |
| `127.0.0.1` | Network address | Loopback address that points to the local machine |
| `1080` | Port | Common proxy service port used here as the local proxy listener |
| `https://www.google.com` | External endpoint | Target URL used in the sample outbound request |