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

Puedes enviar datos en streaming al cliente usando **Server-Sent Events** (SSE).

Esto es similar a [Stream JSON Lines](stream-json-lines.md), pero usa el formato `text/event-stream`, que los navegadores soportan de forma nativa con la [`EventSource` API](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).

/// info | Información

Añadido en FastAPI 0.135.0.

///

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

Incluso podría ser un stream infinito, donde sigues enviando datos.

## JSON Lines { #json-lines }

En estos casos, es común enviar "**JSON Lines**", que es un formato donde envías un objeto JSON por línea.

Una response tendría un tipo de contenido `application/jsonl` (en lugar de `application/json`) y el response body sería algo como:

```json

        verify(response).addHeader("WWW-Authenticate", "Basic realm=\"TestRealm\"");
        verify(response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);
    }

    /**
     * Test handling of various path formats
     * This test verifies path parsing without actual network operations
     */
    @Test
    void testPathHandling() throws Exception {
        // Create a test-specific NetworkExplorer that doesn't make network calls

// an object. It indicates that the object itself or its metadata was
// modified accidentally or maliciously.
type Error struct {
	msg   string
	cause error
}

// Errorf - formats according to a format specifier and returns
// the string as a value that satisfies error of type crypto.Error
func Errorf(format string, a ...any) error {
	e := fmt.Errorf(format, a...)
	ee := Error{}
	ee.msg = e.Error()

import com.google.common.annotations.J2ktIncompatible;
import java.io.Serializable;
import org.jspecify.annotations.Nullable;

/**
 * Utility class for converting between various ASCII case formats. Behavior is undefined for
 * non-ASCII input.
 *
 * @author Mike Bostock
 * @since 1.0
 */
@GwtCompatible
public enum CaseFormat {
  /**

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

Pode até ser um Stream infinito, em que você continua enviando dados.

## JSON Lines { #json-lines }

Nesses casos, é comum enviar "**JSON Lines**", um formato em que você envia um objeto JSON por linha.

Uma response teria um tipo de conteúdo `application/jsonl` (em vez de `application/json`) e o corpo seria algo como:

```json

///

## Execute o Programa Servidor { #run-the-server-program }

Se você instalou um servidor ASGI manualmente, normalmente precisará passar uma string de importação em um formato especial para que ele importe sua aplicação FastAPI:

<div class="termy">

```console
$ uvicorn main:app --host 0.0.0.0 --port 80

func recover() any

// The print built-in function formats its arguments in an
// implementation-specific way and writes the result to standard error.
// Print is useful for bootstrapping and debugging; it is not guaranteed
// to stay in the language.
func print(args ...Type)

// The println built-in function formats its arguments in an
// implementation-specific way and writes the result to standard error.

            logger.debug("Failed to delete remaining log notifications.", e);
        }

        return "Sent log notifications: " + events.size() + " events.";
    }

    /**
     * Formats a list of log notification events into a human-readable summary string.
     *
     * @param events the list of log notification events
     * @param maxDetailsLength the maximum length of the details string

                }).collect(Collectors.joining("\n")));
    }

    /**
     * Converts a GSA URL pattern into a regular expression pattern suitable for Fess.
     * Handles various GSA pattern formats including regexp, contains, and URL-based patterns.
     *
     * @param s the input GSA pattern string
     * @return a regular expression pattern string, or empty string for comments/invalid patterns
     */