```

</div>

### Step 3: *path operation*を作成

#### パス

ここでの「パス」とは、最初の`/`から始まるURLの最後の部分を指します。

したがって、次のようなURLでは:

```
https://example.com/items/foo
```

...パスは次のようになります:

```
/items/foo
```

/// info | "情報"

「パス」は一般に「エンドポイント」または「ルート」とも呼ばれます。

///

APIを構築する際、「パス」は「関心事」と「リソース」を分離するための主要な方法です。

#### Operation

  }

  public void testAsSet_absentIsImmutable() {
    Set<Object> absentAsSet = Optional.absent().asSet();
    assertThrows(UnsupportedOperationException.class, () -> absentAsSet.add("foo"));
  }

  public void testTransform_absent() {
    assertEquals(Optional.absent(), Optional.absent().transform(Functions.identity()));

	RET R30					   // c0035fd6
	RET	foo(SB)

// B/BL/B.cond cases, and canonical names JMP, CALL.
	BL	1(PC)      // CALL 1(PC)
	BL	(R2)       // CALL (R2)
	BL	foo(SB)    // CALL foo(SB)
	BL	bar<>(SB)  // CALL bar<>(SB)
	B	foo(SB)    // JMP foo(SB)
	BEQ	1(PC)
	BEQ	2(PC)
	TBZ	$1, R1, 2(PC)
	TBNZ	$2, R2, 2(PC)
	JMP	foo(SB)
	CALL	foo(SB)

// ADR
	ADR	next, R11     // ADR R11 // 2b000010

////

and those default values won't be included in the response, only the values actually set.

So, if you send a request to that *path operation* for the item with ID `foo`, the response (not including default values) will be:

```JSON
{
    "name": "Foo",
    "price": 50.2
}
```

/// info

 * </ul>
 *
 * <h4>Example usage</h4>
 *
 * <pre>{@code
 * class Foo {
 *   private static final ImmutableSet<String> RESERVED_CODES =
 *       ImmutableSet.of("AZ", "CQ", "ZX");
 *
 *   private final ImmutableSet<String> codes;
 *
 *   public Foo(Iterable<String> codes) {
 *     this.codes = ImmutableSet.copyOf(codes);

   * ...
   * synchronized (queue) {  // Must synchronize on queue!
   *   Iterator<E> i = queue.iterator(); // Must be in synchronized block
   *   while (i.hasNext()) {
   *     foo(i.next());
   *   }
   * }
   * }</pre>
   *
   * <p>Failure to follow this advice may result in non-deterministic behavior.
   *

```Python hl_lines="22"
{!> ../../docs_src/response_model/tutorial004_py310.py!}
```

////

& 👈 🔢 💲 🏆 🚫 🔌 📨, 🕴 💲 🤙 ⚒.

, 🚥 👆 📨 📨 👈 *➡ 🛠️* 🏬 ⏮️ 🆔 `foo`, 📨 (🚫 ✅ 🔢 💲) 🔜:

```JSON
{
    "name": "Foo",
    "price": 50.2
}
```

/// info

</p>

<p>
The <code>SB</code> pseudo-register can be thought of as the origin of memory, so the symbol <code>foo(SB)</code>
is the name <code>foo</code> as an address in memory.
This form is used to name global functions and data.
Adding <code>&lt;&gt;</code> to the name, as in <span style="white-space: nowrap"><code>foo&lt;&gt;(SB)</code></span>, makes the name

    }

    @Test
    void testValidateUniqueProxyId() throws Exception {
        Settings settings = new Settings();
        Proxy proxy = new Proxy();
        String id = "foo";
        proxy.setId(id);
        proxy.setHost("www.example.com");
        settings.addProxy(proxy);
        settings.addProxy(proxy);

        SimpleProblemCollector problems = new SimpleProblemCollector();

  }

  @Test
  fun noConnectionFoundOnFollowUp() {
    server.enqueue(
      MockResponse.Builder()
        .code(301)
        .addHeader("Location", "/foo")
        .build(),
    )
    server.enqueue(
      MockResponse.Builder()
        .body("ABC")
        .build(),
    )
    val call =
      client.newCall(
        Request.Builder()