}

    @Override
    public void send(ByteBuffer data, RdmaMemoryRegion region) throws IOException {
        if (state != RdmaConnectionState.ESTABLISHED && state != RdmaConnectionState.CONNECTED) {
            throw new IOException("Connection not established");
        }

        try {
            while (data.hasRemaining()) {
                socketChannel.write(data);
            }
        } catch (IOException e) {

{* ../../docs_src/request_form_models/tutorial001_an_py39.py hl[9:11,15] *}

**FastAPI** will **extract** the data for **each field** from the **form data** in the request and give you the Pydantic model you defined.

## Check the Docs { #check-the-docs }

You can verify it in the docs UI at `/docs`:

<div class="screenshot">

  delete[] dims;

  TF_TString* data = static_cast<TF_TString*>(TF_TensorData(t));
  for (int i = 0; i < batch_size; ++i) {
    TF_TString_Init(&data[i]);
    // The following input string length is large enough to make sure that
    // copy to tstring in large mode.
    std::string source =
        "This is the " + std::to_string(i + 1) + "th. data element\n";
    TF_TString_Copy(&data[i], source.c_str(), source.length());
  }

  @Override
  protected Table<String, Integer, Character> create(@Nullable Object... data) {
    Table<Integer, String, Character> original = HashBasedTable.create();
    Table<String, Integer, Character> table = transpose(original);
    table.clear();
    populate(table, data);
    return table;
  }

  public void testTransposeTransposed() {

        int start = bufferIndex;

        if (len < 32) {
            throw new SMBProtocolDecodingException("Lease V1 context data too short: " + len);
        }

        // Read lease V1 data (32 bytes)
        byte[] keyBytes = new byte[16];
        System.arraycopy(buffer, bufferIndex, keyBytes, 0, 16);
        this.leaseKey = new Smb2LeaseKey(keyBytes);
        bufferIndex += 16;

                };
                params.q = query;
                final SearchRenderData data = new SearchRenderData();
                searchHelper.search(params, data, userBean);
                if (logger.isDebugEnabled()) {
                    logger.debug("loaded facet data: {}", data);
                }
                return data.getFacetResponse();
            });
        } catch (final ExecutionException e) {

    }

    @Test
    void testWriteOctetArray() {
        byte[] data = { 0x01, 0x02, 0x03, 0x04 };
        ndrBuffer.writeOctetArray(data, 0, data.length);

        assertEquals(data.length, ndrBuffer.getIndex());
        assertEquals(data.length, ndrBuffer.getLength());
        assertArrayEquals(data, Arrays.copyOfRange(buffer, 0, data.length));

        // Write with offset and length
        ndrBuffer.setIndex(10);

			if e := enc.Encode(struct {
				Versions []version
			}{Versions: versions}); e != nil {
				return nil, e
			}
			data = b
		default:
			return nil, fmt.Errorf("unknown metadata version %d", minor)
		}

		if datajson {
			b, e := data.json()
			if e != nil {
				return nil, e
			}
			buf = bytes.NewBuffer(b)
		}

		return buf.Bytes(), nil
	}

These handlers are in charge of returning the default JSON responses when you `raise` an `HTTPException` and when the request has invalid data.

You can override these exception handlers with your own.

### Override request validation exceptions { #override-request-validation-exceptions }

When a request contains invalid data, **FastAPI** internally raises a `RequestValidationError`.

And it also includes a default exception handler for it.

        when(response.getHeaderStart()).thenReturn(0);

        // Write FileInternalInfo data at the large offset
        SMBUtil.writeInt8(0x123456789ABCDEFL, buffer, 1000);

        int result = response.readBytesWireFormat(buffer, bufferIndex);

        // Should return at least to the end of the data
        assertTrue(result >= 900); // 1000 + 8 - 100
        assertNotNull(response.getInfo());
    }