limiter.acquire(1); // R0.00, since it's the first request

    limiter.acquire(1); // R0.00, from capacity
    limiter.acquire(3); // R0.00, from capacity
    limiter.acquire(1); // R0.00, concluding a burst of 5 permits

    limiter.acquire(); // R0.20, capacity exhausted
    assertEvents(
        "U1.00", "U1.00", "R0.00", "R0.00", "R0.00", "R0.00", // first request and burst
        "R0.20");
  }

    limiter.acquire(1); // R0.00, since it's the first request

    limiter.acquire(1); // R0.00, from capacity
    limiter.acquire(3); // R0.00, from capacity
    limiter.acquire(1); // R0.00, concluding a burst of 5 permits

    limiter.acquire(); // R0.20, capacity exhausted
    assertEvents(
        "U1.00", "U1.00", "R0.00", "R0.00", "R0.00", "R0.00", // first request and burst
        "R0.20");
  }

# Header Parameters { #header-parameters }

You can define Header parameters the same way you define `Query`, `Path` and `Cookie` parameters.

## Import `Header` { #import-header }

First import `Header`:

{* ../../docs_src/header_params/tutorial001_an_py310.py hl[3] *}

## Declare `Header` parameters { #declare-header-parameters }

Then declare the header parameters using the same structure as with `Path`, `Query` and `Cookie`.

        // Then - Check that counter portion has entropy
        // For SMB3-compliant nonces, the first 8 bytes are a counter (little-endian)
        // so we check that the counter bytes change as expected
        Set<String> uniqueCounters = new HashSet<>();
        for (int i = 0; i < sampleSize; i++) {
            // Extract first 8 bytes as counter
            byte[] counter = new byte[8];

        String sessionId = "test_replace";
        List<String> cmdList1 = Arrays.asList("echo", "first");
        List<String> cmdList2 = Arrays.asList("echo", "second");
        Consumer<ProcessBuilder> pbCall = pb -> {
            pb.redirectErrorStream(true);
        };

        try {
            // Start first process
            JobProcess jobProcess1 = processHelper.startProcess(sessionId, cmdList1, pbCall);

        assertNotNull(entry2);
        assertEquals(DirectoryCacheScope.IMMEDIATE_CHILDREN, entry1.getScope());
        assertEquals(DirectoryCacheScope.RECURSIVE_TREE, entry2.getScope());

        // Update first directory cache
        List<SmbFile> files1 = Arrays.asList(mockFile1);
        directoryLeaseManager.updateDirectoryCache(dir1, files1);

        // Update second directory cache

	wg := sync.WaitGroup{}
	for i := 0; i < 100; i++ {
		wg.Add(1)
		go func() {
			user := User{Name: "jinzhu"}
			tx.Create(&user)

			var result User
			tx.First(&result)
			wg.Done()
		}()
	}
	wg.Wait()

	conn, ok := tx.ConnPool.(*gorm.PreparedStmtDB)
	AssertEqual(t, ok, true)
	AssertEqual(t, len(conn.Stmts.Keys()), 2)
	for _, stmt := range conn.Stmts.Keys() {

      - name: 'Set up JDKs'
        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
        with:
          # For discussion, see the first setup-java block.
          # The publish-snapshot workflow doesn't run tests, so we don't have to care which version Maven would select for that step.
          java-version: 24
          distribution: 'temurin'

            throw new IllegalArgumentException("Share name contains invalid characters: " + share);
        }
    }

    /**
     * Validates integer for safe arithmetic operations
     *
     * @param a first operand
     * @param b second operand
     * @param operation the operation name
     * @throws ArithmeticException if operation would overflow
     */

# Development - Contributing

First, you might want to see the basic ways to [help FastAPI and get help](help-fastapi.md){.internal-link target=_blank}.

## Developing

If you already cloned the <a href="https://github.com/fastapi/fastapi" class="external-link" target="_blank">fastapi repository</a> and you want to deep dive in the code, here are some guidelines to set up your environment.

### Virtual environment