Temporarily adopting this point of view (of the *external developer*) can help you feel like it's more obvious where to put the parameters, the Pydantic model for the body, for the response, etc. for that *external API*.

///

### Create a callback `APIRouter`

First create a new `APIRouter` that will contain one or more callbacks.

}

// Save - saves the events to the store which will be replayed when the amqp connection is active.
func (target *AMQPTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}
	if err := target.init(); err != nil {
		return err
	}
	ch, confirms, err := target.channel()
	if err != nil {
		return err
	}
	defer ch.Close()

![put](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/replication/PUT_bucket_replication.png)

![head](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/replication/HEAD_bucket_replication.png)

        final String[] toAddresses = form.notificationTo.split(",");
        final Map<String, Object> dataMap = new HashMap<>();
        dataMap.put("hostname", systemHelper.getHostname());

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final Postbox postbox = ComponentUtil.getComponent(Postbox.class);
        try {

	data, err := json.Marshal(userInfo)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	writeSuccessResponseJSON(w, data)
}

// UpdateGroupMembers - PUT /minio/admin/v3/update-group-members
func (a adminAPIHandlers) UpdateGroupMembers(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objectAPI, _ := validateAdminReq(ctx, w, r, policy.AddUserToGroupAdminAction)

		// Remove the transitioned object whose object version is being overwritten.
		os.Sweep()
	}
}

// PutObjectHandler - PUT Object
// ----------
// This implementation of the PUT operation adds an object to a bucket.
// Notice: The S3 client can send secret keys in headers for encryption related jobs,

# Below should fail as compression and SSEC used at the same time
# DISABLED: We must check the response header to see if compression was actually applied
#RESULT=$({ ./mc put /tmp/data/mpartobj.txt minio1/test-bucket/mpartobj.txt --enc-c "minio1/test-bucket/mpartobj.txt=${TEST_MINIO_ENC_KEY}" --insecure; } 2>&1)

    assertThat(recordedRequest.method).isEqualTo("DELETE")
    assertThat(recordedRequest.body.readUtf8()).isEqualTo("def")
  }

  @Test
  fun put() {
    server.enqueue(MockResponse(body = "abc"))
    val request =
      Request.Builder()
        .url(server.url("/"))
        .put("def".toRequestBody("text/plain".toMediaType()))
        .build()
    executeSynchronously(request)
      .assertCode(200)

                "a=\"android\";\$Path=\"/\";\$Domain=\"${serverUrl.host}\"; " +
                "b=\"banana\";\$Path=\"/\";\$Domain=\"${serverUrl.host}\"",
            ),
        )

        override fun put(
          uri: URI,
          map: Map<String, List<String>>,
        ) {
        }
      }
    client =
      client.newBuilder()
        .cookieJar(JavaNetCookieJar(androidCookieHandler))

                            tags.toArray(new String[tags.size()]), roles.toArray(new String[roles.size()]), 1, langs);
                    duplicateSessionMap.put(sessionId, requestedAt);
                }
            }
        });
        refresh();
    }

    public void indexFromDocuments(final Consumer<Boolean> success, final Consumer<Throwable> error) {