Now, let's see how you could use that to return a custom response.

Let's say that you want to return an [XML](https://en.wikipedia.org/wiki/XML) response.

You could put your XML content in a string, put that in a `Response`, and return it:

{* ../../docs_src/response_directly/tutorial002_py310.py hl[1,18] *}

## How a Response Model Works { #how-a-response-model-works }

                HttpPost postRequest = new HttpPost(url);
                postRequest.addHeader("Authorization", "token " + token);
                postRequest.addHeader("Content-Type", "application/json");
                postRequest.setEntity(new StringEntity(output.toString()));
                CloseableHttpResponse response = client.execute(postRequest);

    @Test
    public void test_constructor_withLongMessage() {
        // Test with long message
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            sb.append("Long message content ");
        }
        String longMessage = sb.toString();
        ResultOffsetExceededException exception = new ResultOffsetExceededException(longMessage);

        assertEquals(longMessage, exception.getMessage());

import jcifs.netbios.UniAddress;
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbAuthException;

/**
 * This servlet may be used with pre-2.3 servlet containers
 * to protect content with NTLM HTTP Authentication. Servlets that
 * extend this abstract base class may be authenticated against an SMB
 * server or domain controller depending on how the

    Note over App: Keeps producing...
    Note over Client: Keeps consuming...
```

它甚至可以是無限串流，你可以一直持續傳送資料。

## JSON Lines { #json-lines }

在這些情況下，常見做法是傳送「**JSON Lines**」，這是一種每一行各包含一個 JSON 物件的格式。

回應的 content type 會是 `application/jsonl`（而不是 `application/json`），而本體內容會像這樣：

```json
{"name": "Plumbus", "description": "A multi-purpose household device."}
{"name": "Portal Gun", "description": "A portal opening device."}

	if objAPI == nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	vars := mux.Vars(r)
	bucket := vars["bucket"]

	// PutBucketLifecycle always needs a Content-Md5
	if !validateLengthAndChecksum(r) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingContentMD5), r.URL)
		return
	}

		// avoid registering commands which are not being built (via
		// go:build tags)
		if command.Name == "" {
			return
		}
		commands = append(commands, command)
		commandsTree.Insert(command.Name)
	}

	findClosestCommands := func(command string) []string {
		var closestCommands []string
		closestCommands = append(closestCommands, commandsTree.PrefixMatch(command)...)

	osMetricStat
	osMetricAccess
	osMetricCreate
	osMetricReadDirent
	osMetricFdatasync
	osMetricSync

	// .... add more

	osMetricLast
)

var globalOSMetrics osMetrics

func init() {
	// Inject metrics.
	ioutilx.OsOpenFile = OpenFile
	ioutilx.OpenFileDirectIO = OpenFileDirectIO
	ioutilx.OsOpen = Open
}

type osMetrics struct {
	// All fields must be accessed atomically and aligned.

	switch len(tokens) {
	case 2:
		req.Header.Set("Authorization", target.args.AuthToken)
	case 1:
		req.Header.Set("Authorization", "Bearer "+target.args.AuthToken)
	}

	req.Header.Set("Content-Type", "application/json")

	return target.httpClient.Do(req)
}

// Close the target. Will cancel all active requests.
func (target *WebhookTarget) Close() error {
	target.cancel()
	return nil
}

## Scope

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