# Server-Sent Events (SSE) { #server-sent-events-sse }

You can stream data to the client using **Server-Sent Events** (SSE).

This is similar to [Stream JSON Lines](stream-json-lines.md), but uses the `text/event-stream` format, which is supported natively by browsers with the [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).

/// info

Added in FastAPI 0.135.0.

///

import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Encapsulates comparison and printing logic for an x.y.z version with optional qualifier. This class is very similar
 * to {@link Version}, but it dissects the qualifier in such a way that is incompatible
 * with how {@link Version} is used in the build. It also retains any qualifier (prerelease) information, and uses

     */
    @ValidateTypeFailure
    public Integer offset;

    /**
     * The page number for pagination.
     */
    @ValidateTypeFailure
    public Integer pn;

    /**
     * Similar document hash for finding related documents.
     */
    @Size(max = 1000)
    public String sdh;

    /**
     * Parameter to control tracking of total hits in search results.
     */
    @Size(max = 100)

The `TestClient` is based on [HTTPX](https://www.python-httpx.org), and luckily, we can use it directly to test the API.

## Example { #example }

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md) and [Testing](../tutorial/testing.md):

```
.
├── app
│   ├── __init__.py
│   ├── main.py
│   └── test_main.py
```

### Response Elements

XML response for this API is similar to [AWS STS AssumeRoleWithWebIdentity](https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithWebIdentity.html#API_AssumeRoleWithWebIdentity_ResponseElements)

### Errors

    <function-signature>java.lang.String url(java.lang.String)</function-signature>
    <example>&lt;a href="${fe:url(param:info)}" ...</example>
  </function>

  <function>
    <description>Encode Similar Document Hash.</description>
    <name>sdh</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String sdh(java.lang.String)</function-signature>

 *       MoreExecutors#listeningDecorator(java.util.concurrent.ExecutorService)
 *       MoreExecutors.listeningDecorator}.
 *   <li>If you manually call {@link java.util.concurrent.FutureTask#set} or a similar method,
 *       create a {@link SettableFuture} instead. (If your needs are more complex, you may prefer
 *       {@link AbstractFuture}.)
 * </ul>
 *

/**
 * API action for admin duplicate host management.
 * Provides RESTful API endpoints for managing duplicate host settings in the Fess search engine.
 * Duplicate host settings help prevent indexing the same content from multiple similar URLs.
 *
 */
public class ApiAdminDuplicatehostAction extends FessApiAdminAction {

    private static final Logger logger = LogManager.getLogger(ApiAdminDuplicatehostAction.class);

##### COMPATIBLE_TLS versions

* TLSv1

[OkHttp 3.11][OkHttp311]
------------------------

_2018-07-12_

Added a new extra strict RESTRICTED_TLS configuration inspired by [Google Cloud’s similar policy][googlecloud_ssl_policy]. It is appropriate when both the host platform
(JVM/Conscrypt/Android) and target webserver are current.

##### RESTRICTED_TLS cipher suites

 * TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256

Esto significa que **FastAPI** fue específicamente probado con los editores usados por el 80% de los desarrolladores de Python. Y como la mayoría de los otros editores tienden a funcionar de manera similar, todos sus beneficios deberían funcionar prácticamente para todos los editores.