* 
     * @param req
     *            The servlet request
     * @param resp
     *            The servlet response
     * @param skipAuthentication
     *            If true the negotiation is only done if it is
     *            initiated by the client (MSIE post requests after successful NTLM SSP
     *            authentication). If false and the user has not been authenticated yet

# Using Dataclasses

FastAPI is built on top of **Pydantic**, and I have been showing you how to use Pydantic models to declare requests and responses.

But FastAPI also supports using <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> the same way:

{* ../../docs_src/dataclasses/tutorial001.py hl[1,7:12,19:20] *}

	207, 151, 211, 146, // message crc.
}

// newErrorMessage - creates new Request Level Error Message. S3 sends this message if the request failed for any reason.
// It contains the error code and error message for the failure. If S3 sends a RequestLevelError message,
// it doesn't send an End message.
//
// Header specification:
// Request-level error messages contain three headers, as follows:

///

### <a href="https://requests.readthedocs.io" class="external-link" target="_blank">Requests</a>

**FastAPI** aslında **Requests**'in bir alternatifi değil. İkisininde kapsamı oldukça farklı.

Aslında Requests'i bir FastAPI uygulamasının *içinde* kullanmak daha olağan olurdu.

Ama yine de, FastAPI, Requests'ten oldukça ilham aldı.

## Changes by Kind

### API Change

        /*
         * Probably is not worth it, but here I make sure I restore request
         * to its original state.
         */
        try {
            LocalArtifactRepository ideWorkspace =
                    plexus.lookup(LocalArtifactRepository.class, LocalArtifactRepository.IDE_WORKSPACE);

	for _, ep := range testServer.Disks {
		for _, disk := range ep.Endpoints {
			os.RemoveAll(disk.Path)
		}
	}
}

// Truncate request to simulate unexpected EOF for a request signed using streaming signature v4.
func truncateChunkByHalfSigv4(req *http.Request) (*http.Request, error) {
	bufReader := bufio.NewReader(req.Body)
	hexChunkSize, chunkSignature, err := readChunkLine(bufReader)
	if err != nil {
		return nil, err

    assertThat(reader.readLine()).isEqualTo("hello world")
    val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("GET / HTTP/1.1")
    assertThat(request.headers["Accept-Language"]).isEqualTo("en-US")

    // Server has no more requests.
    assertThat(server.takeRequest(100, TimeUnit.MILLISECONDS)).isNull()
  }

  @Test
  fun redirect() {

		"s3:GetObject",
		"s3:PutObject"
	  ],
	  "Effect": "Allow",
	  "Resource": ["arn:aws:s3:::mybucket/${ldap:username}/*"]
	}
  ]
}
```

#### Common information available in all requests

- `aws:CurrentTime` - This can be used for conditions that check the date and time.
- `aws:EpochTime` - This is the date in epoch or Unix time, for use with date/time conditions.

		rec := httptest.NewRecorder()
		// construct HTTP request
		req, err := newTestSignedRequestV4(testCase.method, getBucketLifecycleURL("", testCase.bucketName),
			int64(len(testCase.body)), bytes.NewReader(testCase.body), testCase.accessKey, testCase.secretKey, nil)
		if err != nil {
			t.Fatalf("Test %d: %s: Failed to create HTTP request for GetBucketLocationHandler: <ERROR> %v", i+1, instanceType, err)
		}