if !httpWriter.HasWritten() {
			// write error response only if no data or headers has been written to client yet
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		return
	}

	if err = httpWriter.Close(); err != nil {
		if !httpWriter.HasWritten() { // write error response only if no data or headers has been written to client yet
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)

///

## Add custom headers { #add-custom-headers }

There are some situations in where it's useful to be able to add custom headers to the HTTP error. For example, for some types of security.

You probably won't need to use it directly in your code.

But in case you needed it for an advanced scenario, you can add custom headers:

{* ../../docs_src/handling_errors/tutorial002.py hl[14] *}

import assertk.assertions.isNull
import assertk.assertions.isTrue
import kotlin.test.assertFailsWith
import mockwebserver3.MockResponse
import mockwebserver3.MockWebServer
import mockwebserver3.junit5.StartStop
import okhttp3.Headers.Companion.headersOf
import okhttp3.OkHttpClientTestRule
import okhttp3.Protocol
import okhttp3.RecordingEventListener
import okhttp3.RecordingHostnameVerifier
import okhttp3.Request

"users[*].config.scopes" field in the KUBECONFIG file.) This way, users can now  set a Google Service Account JSON key in the  GOOGLE_APPLICATION_CREDENTIALS environment variable, craft a kubeconfig file with GKE master IP+CA cert, and authenticate to GKE in headless mode without requiring gcloud CLI. ([#58141](https://github.com/kubernetes/kubernetes/pull/58141), [@ahmetb](https://github.com/ahmetb))

* kubectl port-forward no longer supports the deprecated -p <pod-name> flag; the flag itself is...

* OpenStack cloudprovider: Fix deletion of orphaned routes ([#62729](https://github.com/kubernetes/kubernetes/pull/62729), [@databus23](https://github.com/databus23))
* Fix a bug that headless service without ports fails to have endpoint created. ([#62497](https://github.com/kubernetes/kubernetes/pull/62497), [@MrHohn](https://github.com/MrHohn))

			InputS3URL:  u.String(),
			OutputRoute: shortuuid.New(),
			OutputToken: hex.EncodeToString(ckSum[:]),
		},
		UserRequest: levent.UserRequest{
			URL:     r.URL.String(),
			Headers: r.Header.Clone(),
		},
		UserIdentity: levent.Identity{
			Type:        "IAMUser",
			PrincipalID: cred.ParentUser,
			AccessKeyID: cred.AccessKey,
		},
	}
	return eventData, nil
}

  @Throws(IOException::class)
  fun connectionPreface() {
    withLock {
      if (closed) throw IOException("closed")
      if (!client) return // Nothing to write; servers don't send connection headers!
      if (logger.isLoggable(FINE)) {
        logger.fine(format(">> CONNECTION ${CONNECTION_PREFACE.hex()}"))
      }
      sink.write(CONNECTION_PREFACE)
      sink.flush()
    }
  }

 */
public class SearchForm {

    /**
     * Default constructor for SearchForm.
     */
    public SearchForm() {
    }

    /**
     * The ID field for searching request headers.
     */
    public String id;

import mockwebserver3.MockWebServer;
import okhttp3.Headers;
import org.junit.Test;

import java.io.IOException;

/**
 * Unit test for simple App.
 */
public class AppTest {
  private final MockWebServer mockWebServer = new MockWebServer();

  @Test
  public void testApp() throws IOException {
    mockWebServer.enqueue(new MockResponse(200, Headers.of(), "Hello, Maven!"));
    mockWebServer.start();

        server minio4:9000;
    }

    # main minio
    server {
        listen       9000;
        listen  [::]:9000;
        server_name  localhost;

         # To allow special characters in headers
         ignore_invalid_headers off;
         # Allow any size file to be uploaded.
         # Set to a value such as 1000m; to restrict file size to a specific value
         client_max_body_size 0;