Note over client,operation: Response is already sent, can't change it anymore
    opt Tasks
        operation -->> tasks: Send background tasks
    end
    opt Raise other exception
        tasks -->> tasks: Handle exceptions in the background task code
    end
```

/// info

Only **one response** will be sent to the client. It might be one of the error responses or it will be the response from the *path operation*.

# Usando Dataclasses { #using-dataclasses }

FastAPI está construido sobre **Pydantic**, y te he estado mostrando cómo usar modelos de Pydantic para declarar requests y responses.

Pero FastAPI también soporta el uso de <a href="https://docs.python.org/3/library/dataclasses.html" class="external-link" target="_blank">`dataclasses`</a> de la misma manera:

{* ../../docs_src/dataclasses_/tutorial001_py310.py hl[1,6:11,18:19] *}

        });
        return asJson(new ApiResponse().status(Status.OK).result());
    }

    /**
     * Creates an edit body from a job log entity for API responses.
     *
     * @param entity the job log entity to convert
     * @return edit body containing the entity data
     */
    protected EditBody createEditBody(final JobLog entity) {

	}
	// Start processing requests.
	close(processHandler)

	// Drain responses
	got := 0
	for resp := range st.responses {
		// t.Log("got response", resp)
		errFatal(resp.Err)
		if resp.Msg[0] != byte(got) {
			t.Error("expected response", got, "got", resp.Msg[0])
		}
		got++
	}
	if got != 100 {
		t.Error("expected 100 responses, got", got)
	}
}

        });
        return asJson(new ApiResponse().status(Status.OK).result());
    }

    /**
     * Creates an edit body from a file authentication entity for API responses.
     *
     * @param entity the file authentication entity to convert
     * @return edit body containing the entity data
     */
    protected EditBody createEditBody(final FileAuthentication entity) {

import (
	"context"
	"errors"
)

// A Stream is a two-way stream.
// All responses *must* be read by the caller.
// If the call is canceled through the context,
// the appropriate error will be returned.
type Stream struct {
	// responses from the remote server.
	// Channel will be closed after error or when remote closes.
	// All responses *must* be read by the caller until either an error is returned or the channel is closed.

It includes the `tags`, `parameters`, `requestBody`, `responses`, etc.

This *path operation*-specific OpenAPI schema is normally generated automatically by **FastAPI**, but you can also extend it.

/// tip

This is a low level extension point.

If you only need to declare additional responses, a more convenient way to do it is with [Additional Responses in OpenAPI](additional-responses.md){.internal-link target=_blank}.

///

	if handler == nil {
		return nil, ErrUnknownHandler
	}

	var requests chan []byte
	var responses chan Response
	if handler.InCapacity > 0 {
		requests = make(chan []byte, handler.InCapacity)
	}
	if handler.OutCapacity > 0 {
		responses = make(chan Response, handler.OutCapacity)
	} else {
		responses = make(chan Response, 1)
	}

	cl, err := c.newMuxClient(ctx)
	if err != nil {
		return nil, err
	}

        }
        return asJson(new ApiResult.ApiUpdateResponse().id(id).created(false).status(ApiResult.Status.OK).result());
    }

    /**
     * Creates an edit body from a path mapping entity for API responses.
     *
     * @param entity the path mapping entity to convert
     * @return edit body containing the entity data
     */
    protected EditBody createEditBody(final PathMapping entity) {

        });
        return asJson(new ApiResponse().status(Status.OK).result());
    }

    /**
     * Creates an edit body from a related content entity for API responses.
     *
     * @param entity the related content entity to convert
     * @return edit body containing the entity data
     */
    protected EditBody createEditBody(final RelatedContent entity) {