int bytesWritten = write.writeBytesWireFormat(dst, 0);

        // Assert
        assertEquals(6, bytesWritten, "Should write 6 bytes (1 type + 2 length + 3 data)");
        assertEquals(0x01, dst[0], "Data block type");
        assertEquals(3, dst[1] & 0xFF, "Data length low byte");
        assertEquals(0, dst[2] & 0xFF, "Data length high byte");
        assertEquals(2, dst[3], "First data byte");

    }

    @Test
    void sendResetsResponseAndForwards() throws Exception {
        SmbSession session = new SmbSession(addr, 445, inet, 0, auth);
        // prepare a dummy request/response using a real SMB block type
        ServerMessageBlock req = new SmbComOpenAndX("test.txt", 0, 0, null);
        ServerMessageBlock resp = new SmbComOpenAndX("test.txt", 0, 0, null);
        resp.received = true;

        // When - Release session to trigger cleanup
        session.release();

        // Then - Trees should be cleared (we can't directly verify as it's internal,
        // but the cleanup code with synchronized block ensures it happens atomically)
        // The important part is that no exception occurs and the operation is atomic
    }

    /**
     * Test concurrent acquire and release operations.
     */
    @Test

    protected int parameterDisplacement;
    /** Number of data bytes being sent in this request */
    protected int dataCount;
    /** Offset from the start of the SMB header to the data bytes */
    protected int dataOffset;
    /** Displacement of these data bytes from the start of the total data block */
    protected int dataDisplacement;

   * achieved or retained.
   *
   * @since 8.0
   */
  public static final byte SYN = 22;

  /**
   * End of Transmission Block: A communication control character used to indicate the end of a
   * block of data for communication purposes. ETB is used for blocking data where the block
   * structure is not necessarily related to the processing format.
   *
   * @since 8.0
   */
  public static final byte ETB = 23;

				// Make sure to rollback when panic, Block error or Commit error
				if panicked || err != nil {
					db.RollbackTo(fmt.Sprintf("sp%d", spID))
				}
			}()
		}
		err = fc(db.Session(&Session{NewDB: db.clone == 1}))
	} else {
		tx := db.Begin(opts...)
		if tx.Error != nil {
			return tx.Error
		}

		defer func() {
			// Make sure to rollback when panic, Block error or Commit error

```
cat ${HADOOP_CONF_DIR}/core-site.xml | kv-pairify | grep "s3a"

fs.s3a.access.key=minio
fs.s3a.secret.key=minio123
fs.s3a.path.style.access=true
fs.s3a.block.size=512M
fs.s3a.buffer.dir=${hadoop.tmp.dir}/s3a
fs.s3a.committer.magic.enabled=false
fs.s3a.committer.name=directory
fs.s3a.committer.staging.abort.pending.uploads=true
fs.s3a.committer.staging.conflict-mode=append

**FastAPI** will do the right thing with each, the same as with normal dependencies.

///

## A dependency with `yield` and `try` { #a-dependency-with-yield-and-try }

If you use a `try` block in a dependency with `yield`, you'll receive any exception that was thrown when using the dependency.

    for (Method method : FuturesTest.class.getDeclaredMethods()) {
      if (Modifier.isPublic(method.getModifiers())
          && method.getName().startsWith("test")
          /*
           * When we block access to AtomicReferenceFieldUpdater, we can't even reflect on
           * AbstractFuture, since it declares methods that use that type in their signatures.
           */

///

We can also use this same approach to access the request body in an exception handler.

All we need to do is handle the request inside a `try`/`except` block:

{* ../../docs_src/custom_request_and_route/tutorial002_an_py310.py hl[14,16] *}

If an exception occurs, the`Request` instance will still be in scope, so we can read and make use of the request body when handling the error: