Lets start the lambda handler.

```
python lambda_handler.py
 * Serving Flask app 'webhook'
 * Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:5000
Press CTRL+C to quit
```

## Start MinIO with Lambda target

package cmd

// Code generated by github.com/tinylib/msgp DO NOT EDIT.

import (
	"github.com/tinylib/msgp/msgp"
)

// DecodeMsg implements msgp.Decodable
func (z *nsScannerOptions) DecodeMsg(dc *msgp.Reader) (err error) {
	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, err = dc.ReadMapHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	for zb0001 > 0 {
		zb0001--
		field, err = dc.ReadMapKeyPtr()

	clientETag, err := etag.FromContentMD5(r.Header)
	if err != nil {
		return ErrInvalidDigest
	}

	// Extract either 'X-Amz-Content-Sha256' header or 'X-Amz-Content-Sha256' query parameter (if V4 presigned)
	// Do not verify 'X-Amz-Content-Sha256' if skipSHA256.
	var contentSHA256 []byte
	if skipSHA256 := skipContentSha256Cksum(r); !skipSHA256 && isRequestPresignedSignatureV4(r) {

   *
   * If more than [maxRequestsPerHost] requests are in flight when this is invoked, those requests
   * will remain in flight.
   *
   * WebSocket connections to hosts **do not** count against this limit.
   */
  @get:Synchronized
  var maxRequestsPerHost = 5
    set(maxRequestsPerHost) {
      require(maxRequestsPerHost >= 1) { "max < 1: $maxRequestsPerHost" }
      synchronized(this) {

    /**
     * An item of a label type.
     */
    protected static class LabelTypeItem {
        /**
         * Default constructor.
         */
        public LabelTypeItem() {
            // do nothing
        }

        private String label;

        private String value;

        private String[] permissions;

        private String virtualHost;

        private Locale locale;

 *     inserting the element at `insertionPoint` will retain sorted order.
 */
inline fun binarySearch(
  position: Int,
  limit: Int,
  compare: (Int) -> Int,
): Int {
  // Do the binary searching bit.
  var low = position
  var high = limit - 1
  while (low <= high) {
    val mid = (low + high) / 2
    val compareResult = compare(mid)
    when {

 * typically false on Windows.
 *
 * If this returns false we won't permit simultaneous reads and writes. When writes commit we need
 * to delete the previous snapshots, and that won't succeed if the file is open. (We do permit
 * multiple simultaneous reads.)
 *
 * @param file a file in the directory to check. This file shouldn't already exist!
 */
internal fun FileSystem.isCivilized(file: Path): Boolean {
  sink(file).use {

        int ri = 0;
        final int rlast = result.length - 1;
        int i = 0, b = 0;
        final int len = path.length();
        int strip = 0;

        do {
            if (ri == rlast) {
                result[rlast] = path.substring(b);
                result[rlast] = path.substring(b);
                return strip;
            }

        // Spy on the connection to verify handshake() is called
        NtlmHttpURLConnection spiedConnection = spy(ntlmConnection);
        doNothing().when(spiedConnection).connect();
        // Mock the handshake process to do nothing complex
        mockResponse(HTTP_OK, "OK", null, null);

        // Act & Assert
        assertDoesNotThrow(() -> spiedConnection.getResponseCode());
        // Use reflection to verify handshake method is called

So, what we will do next is add the code to document how that *external API* should look like to receive the callback from *your API*.