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+---
+title: POST
+slug: Web/HTTP/Methods/POST
+translation_of: Web/HTTP/Methods/POST
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>The <strong>HTTP <code>POST</code> method</strong> sends data to the server. The type of the body of the request is indicated by the {{HTTPHeader("Content-Type")}} header.</p>
+
+<p>The difference between <code>PUT</code> and {{HTTPMethod("POST")}} is that <code>PUT</code> is idempotent: calling it once or several times successively has the same effect (that is no <em>side</em> effect), where successive identical <code>POST</code> may have additional effects, like passing an order several times.</p>
+
+<p>A <code>POST</code> request is typically sent via an <a href="/en-US/docs/Web/Guide/HTML/Forms">HTML form</a> and results in a change on the server. In this case, the content type is selected by putting the adequate string in the {{htmlattrxref("enctype", "form")}} attribute of the {{HTMLElement("form")}} element or the {{htmlattrxref("formenctype", "input")}} attribute of the {{HTMLElement("input") }} or {{HTMLElement("button")}} elements:</p>
+
+<ul>
+ <li><code>application/x-www-form-urlencoded</code>: the keys and values are encoded in key-value tuples separated by <code>'&amp;'</code>, with a <code>'='</code> between the key and the value. Non-alphanumeric characters in both keys and values are {{glossary("percent-encoding", "percent encoded")}}: this is the reason why this type is not suitable to use with binary data (use <code>multipart/form-data</code> instead)</li>
+ <li><code>multipart/form-data</code>: each value is sent as a block of data ("body part"), with a user agent-defined delimiter ("boundary") separating each part. The keys are given in the <code>Content-Disposition</code> header of each part.</li>
+ <li><code>text/plain</code></li>
+</ul>
+
+<p>When the <code>POST</code> request is sent via a method other than an HTML form — like via an {{domxref("XMLHttpRequest")}} — the body can take any type. As described in the HTTP 1.1 specification, <code>POST</code> is designed to allow a uniform method to cover the following functions:</p>
+
+<ul>
+ <li>Annotation of existing resources</li>
+ <li>Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles;</li>
+ <li>Adding a new user through a signup modal;</li>
+ <li>Providing a block of data, such as the result of submitting a form, to a data-handling process;</li>
+ <li>Extending a database through an append operation.</li>
+</ul>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Request has body</th>
+   <td>Yes</td>
+  </tr>
+  <tr>
+   <th scope="row">Successful response has body</th>
+   <td>Yes</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Safe")}}</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Idempotent")}}</th>
+   <td>No</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Cacheable")}}</th>
+   <td>Only if freshness information is included</td>
+  </tr>
+  <tr>
+   <th scope="row">Allowed in <a href="/en-US/docs/Web/Guide/HTML/Forms">HTML forms</a></th>
+   <td>Yes</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="格式">格式</h2>
+
+<pre class="syntaxbox">POST /test
+</pre>
+
+<h2 id="範例">範例</h2>
+
+<p>使用 <code>application/x-www-form-urlencoded</code> 內容類型的簡易表單:</p>
+
+<pre class="line-numbers  language-html">POST /test HTTP/1.1
+Host: foo.example
+Content-Type: application/x-www-form-urlencoded
+Content-Length: 27
+
+field1=value1&amp;field2=value2</pre>
+
+<p>使用 <code>multipart/form-data</code> 內容類型的表單:</p>
+
+<pre>POST /test HTTP/1.1
+Host: foo.example
+Content-Type: multipart/form-data;boundary="boundary"
+
+--boundary
+Content-Disposition: form-data; name="field1"
+
+value1
+--boundary
+Content-Disposition: form-data; name="field2"; filename="example.txt"
+
+value2
+--boundary--
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">標題</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{RFC("7231", "POST", "4.3.3")}}</td>
+   <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
+  </tr>
+  <tr>
+   <td>{{RFC("2046", "Common Syntax", "5.1.1")}}</td>
+   <td>Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.methods.POST")}}</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>{{HTTPHeader("Content-Type")}}</li>
+ <li>{{HTTPHeader("Content-Disposition")}}</li>
+</ul>