# Background Tasks { #background-tasks }

You can define background tasks to be run *after* returning a response.

This is useful for operations that need to happen after a request, but that the client doesn't really have to be waiting for the operation to complete before receiving the response.

This includes, for example:

* Email notifications sent after performing an action:

 */
@DisplayName("CloseableIterator Tests")
class CloseableIteratorTest extends BaseTest {

    @Mock
    private CloseableIterator<SmbResource> mockIterator;

    @Test
    @DisplayName("Should define close method")
    void testCloseMethod() throws CIFSException {
        // When
        mockIterator.close();

        // Then
        verify(mockIterator).close();
    }

    @Test

Así que, en OpenAPI, cada uno de los métodos HTTP se llama una "operation".

Vamos a llamarlas "**operaciones**" también.

#### Define un *path operation decorator*

{* ../../docs_src/first_steps/tutorial001.py hl[6] *}

El `@app.get("/")` le dice a **FastAPI** que la función justo debajo se encarga de manejar requests que vayan a:

* el path `/`

# EditorConfig helps developers define and maintain consistent
# coding styles between different editors and IDEs
# editorconfig.org

root = true

[*]

indent_style = space
indent_size = 4


end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

# Markdown files sometimes need trailing whitespaces.
[*.md]
trim_trailing_whitespace = false

[*.{yml,yaml}]
indent_size = 2

{* ../../docs_src/query_params_str_validations/tutorial003_an_py310.py hl[10] *}

## Add regular expressions { #add-regular-expressions }

You can define a <abbr title="A regular expression, regex or regexp is a sequence of characters that define a search pattern for strings.">regular expression</abbr> `pattern` that the parameter should match:

{* ../../docs_src/query_params_str_validations/tutorial004_an_py310.py hl[11] *}

(or (eq .Values.service.type "ClusterIP" "") (empty .Values.service.type)) }} type: ClusterIP {{- if not (empty .Values.service.clusterIP) }} clusterIP: {{ .Values.service.clusterIP }} {{end}} {{- else if eq .Values.service.type "LoadBalancer" }} type: {{ .Values.service.type }} loadBalancerIP: {{ default "" .Values.service.loadBalancerIP }} {{- else }} type: {{ .Values.service.type }} {{- end }} ports: - name: {{ $scheme }} port: {{ .Values.service.port }} protocol: TCP {{- if (and (eq .Values.service.type...

(or (eq .Values.service.type "ClusterIP" "") (empty .Values.service.type)) }} type: ClusterIP {{- if not (empty .Values.service.clusterIP) }} clusterIP: {{ .Values.service.clusterIP }} {{end}} {{- else if eq .Values.service.type "LoadBalancer" }} type: {{ .Values.service.type }} loadBalancerIP: {{ default "" .Values.service.loadBalancerIP }} {{- else }} type: {{ .Values.service.type }} {{- end }} ports: - name: {{ $scheme }} port: {{ .Values.service.port }} protocol: TCP {{- if (and (eq .Values.service.type...

(or (eq .Values.service.type "ClusterIP" "") (empty .Values.service.type)) }} type: ClusterIP {{- if not (empty .Values.service.clusterIP) }} clusterIP: {{ .Values.service.clusterIP }} {{end}} {{- else if eq .Values.service.type "LoadBalancer" }} type: {{ .Values.service.type }} loadBalancerIP: {{ default "" .Values.service.loadBalancerIP }} {{- else }} type: {{ .Values.service.type }} {{- end }} ports: - name: {{ $scheme }} port: {{ .Values.service.port }} protocol: TCP {{- if (and (eq .Values.service.type...

	} unicode_string;

	/* 
	 * typedef struct _SID_IDENTIFIER_AUTHORITY {
	 *     UCHAR Value[6];
	 * } SID_IDENTIFIER_AUTHORITY, *PSID_IDENTIFIER_AUTHORITY;
	 * 
	 * #define SECURITY_NT_AUTHORITY           {0,0,0,0,0,5}
	 * 
	 * typedef struct _SID {
	 *    UCHAR Revision;
	 *    UCHAR SubAuthorityCount;
	 *    SID_IDENTIFIER_AUTHORITY IdentifierAuthority;

	} unicode_string;

	/* 
	 * typedef struct _SID_IDENTIFIER_AUTHORITY {
	 *     UCHAR Value[6];
	 * } SID_IDENTIFIER_AUTHORITY, *PSID_IDENTIFIER_AUTHORITY;
	 * 
	 * #define SECURITY_NT_AUTHORITY           {0,0,0,0,0,5}
	 * 
	 * typedef struct _SID {
	 *    UCHAR Revision;
	 *    UCHAR SubAuthorityCount;
	 *    SID_IDENTIFIER_AUTHORITY IdentifierAuthority;