* Returns the value of the request header.
     * @return The value of the request header.
     */
    public String getValue() {
        return value;
    }

    /**
     * Sets the value of the request header.
     * @param value The value of the request header.
     */
    public void setValue(final String value) {
        this.value = value;
    }

    /**
     * Checks if the request header is valid.

The response answers the request with a code (like 200 for success or 404 for not found), headers, and its own optional body.

## Rewriting Requests

When you provide OkHttp with an HTTP request, you’re describing the request at a high-level: _“fetch me this URL with these headers.”_ For correctness and efficiency, OkHttp rewrites your request before transmitting it.

        mapJsonAdapter.toJson(requestBody), MEDIA_TYPE_JSON);
    Request request = new Request.Builder()
        .url("https://www.googleapis.com/urlshortener/v1/url?key=" + GOOGLE_API_KEY)
        .post(jsonRequestBody)
        .build();

    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

        @Test
        @DisplayName("Should work as complete request-response cycle")
        void testCompleteRequestResponseCycle() {
            // Create request
            Smb2EchoRequest request = new Smb2EchoRequest(mockConfig);

            // Verify request properties
            assertEquals(0x000D, request.getCommand());
            assertEquals(72, request.size());

            // Create response

     *
     * @param request The original HTTP servlet request
     * @param servletPath The custom servlet path for this web API request
     */
    public WebApiRequest(final HttpServletRequest request, final String servletPath) {
        super(request);
        this.servletPath = servletPath;
    }

    /**
     * Gets the servlet path for this request.

     *   <li>Grouping similar requests for batch processing</li>
     *   <li>Processing requests in parallel where appropriate</li>
     * </ul>
     *
     * @param <REQ> The request type
     * @param <REP> The response type
     * @param req List of requests to process
     * @param supplier Function to execute the batch of requests

     *
     * @return the request key of the next message
     * @throws IOException if an I/O error occurs
     */
    protected abstract Request peekKey() throws IOException;

    /**
     * Sends a request to the remote endpoint.
     *
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected abstract void doSend(Request request) throws IOException;

    /**

    /** The request being built. */
    protected Req request;

    /**
     * Constructor for RequestBuilder.
     * @param client The OpenSearch client.
     * @param request The request instance.
     */
    public RequestBuilder(final Client client, final Req request) {
        this.client = client;
        this.request = request;
    }

    /**
     * Executes the request.

                }
            }

            request.uid = uid;
            request.auth = auth;
            try {
                transport.send(request, response);
            } catch (final SmbException se) {
                if (request instanceof SmbComTreeConnectAndX) {
                    logoff(true);
                }
                request.digest = null;
                throw se;
            }

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`.