```
$ adb logcat '*:E' OkHttp:D Http2:D TestRunner:D TaskRunner:D OkHttpTest:D GnssHAL_GnssInterface:F DeviceStateChecker:F memtrack:F
...
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] responseHeadersEnd: Response{protocol=h2, code=200, message=, url=https://1.1.1.1/dns-query?dns=AAABAAABAAAAAAAAA3d3dwhmYWNlYm9vawNjb20AABwAAQ}
01-01 12:53:32.811 10999 11089 D OkHttp  : [49 ms] responseBodyStart

        raise fastapi.exceptions.FastAPIError(
            "Invalid args for response field! Hint: "
            f"check that {type_} is a valid Pydantic field type. "
            "If you are using a return type annotation that is not a valid Pydantic "
            "field (e.g. Union[Response, dict, None]) you can disable generating the "
            "response model from the type annotation with the path operation decorator "

```Python hl_lines="9  15-16  19-20  23-24"
{!> ../../docs_src/extra_models/tutorial002.py!}
```

////

## `Union` or `anyOf`

You can declare a response to be the `Union` of two or more types, that means, that the response would be any of them.

It will be defined in OpenAPI with `anyOf`.

 * ⬜️ [Okio](https://github.com/square/okio/): A modern I/O API for Java.
 * [OkLog](https://github.com/simonpercic/OkLog): Response logging interceptor for OkHttp. Logs a URL link with URL-encoded response for every OkHttp call.
 * [Okurl](https://github.com/yschimke/okurl/wiki) A curl-like client for social networks and other APIs.

        final RefreshResponse response = searchEngineClient.admin().indices().prepareRefresh(index).execute().actionGet();
        if (logger.isDebugEnabled()) {
            logger.debug("[{}] refresh status: {} ({}/{}/{})", index, response.getStatus(), response.getTotalShards(),
                    response.getSuccessfulShards(), response.getFailedShards());
        }
        return response.getStatus().getStatus();
    }

         * with everything else. If the below clause evaluates true
         * the andx command will not be written and therefore the
         * response will not read a batched command and therefore
         * the 'received' member of the response object will not
         * be set to true indicating the send and sendTransaction
         * methods that the next part should be sent. This is a

////

If a client tries to send some **extra** data in the **query parameters**, they will receive an **error** response.

For example, if the client tries to send a `tool` query parameter with a value of `plumbus`, like:

```http
https://example.com/items/?limit=10&tool=plumbus
```

They will receive an **error** response telling them that the query parameter `tool` is not allowed:

```json
{
    "detail": [
        {

     */
    public void doFilter( ServletRequest request,
                ServletResponse response,
                FilterChain chain ) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = (HttpServletResponse)response;
        NtlmPasswordAuthentication ntlm;

        if ((ntlm = negotiate( req, resp, false )) == null) {

        });
        return response;
    }

    protected void writeNoCache(final StreamResponse response, final ResponseData responseData) {
        response.header("Pragma", "no-cache");
        response.header("Cache-Control", "no-cache");
        response.header("Expires", "Thu, 01 Dec 1994 16:00:00 GMT");
    }

    protected void writeFileName(final StreamResponse response, final ResponseData responseData) {

import java.util.concurrent.TimeUnit
import mockwebserver3.Stream
import mockwebserver3.StreamHandler
import okio.utf8Size

private typealias Action = (Stream) -> Unit

/**
 * A scriptable request/response conversation. Create the script by calling methods like
 * [receiveRequest] in the sequence they are run.
 */
class MockStreamHandler : StreamHandler {
  private val actions = LinkedBlockingQueue<Action>()