# Body - 多個參數 { #body-multiple-parameters }

現在我們已經知道如何使用 `Path` 與 `Query`，接下來看看更進階的請求主體（request body）宣告用法。

## 混用 `Path`、`Query` 與 Body 參數 { #mix-path-query-and-body-parameters }

首先，當然你可以自由混用 `Path`、`Query` 與請求 Body 參數的宣告，**FastAPI** 會知道該怎麼做。

你也可以將 Body 參數宣告為可選，方法是將預設值設為 `None`：

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note | 注意

請注意，在此情況下，從 body 取得的 `item` 是可選的，因為它的預設值是 `None`。

///

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package com.google.common.base;

import com.google.common.annotations.GwtIncompatible;
import org.jspecify.annotations.Nullable;

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package org.apache.maven.lifecycle.internal;

import javax.inject.Inject;
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package com.google.common.collect.testing.testers;

import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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 * Unless required by applicable law or agreed to in writing, software
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/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
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package gradlebuild.nullaway

import org.gradle.api.DefaultTask
import org.gradle.api.artifacts.ArtifactCollection
import org.gradle.api.artifacts.result.ResolvedArtifactResult

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package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.features.CollectionSize.ZERO;

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package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.Helpers.assertEqualInOrder;
import static java.util.Arrays.asList;

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package com.google.common.util.concurrent;

import com.google.common.annotations.GwtCompatible;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;