How to Use rawurldecode with HTTP Request Headers? Practical Development Scenarios

gitbox 2025-09-22

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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h1>How to Use rawurldecode with HTTP Request Headers? Practical Development Scenarios</h1>"</span></span><span>;
<p></span>echo <span><span class="hljs-string">"<p>In PHP development, the function <code>rawurldecode

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2.2 URL-encoded Data in Cookies

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Some systems store URL-encoded data in cookies, especially when it comes to Chinese characters or special symbols:

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Set-Cookie: user_name=%E6%9D%8E%E5%AD%90

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PHP retrieves and decodes it as follows:

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<br>
if (isset($_COOKIE['user_name'])) {<br>
$user = rawurldecode($_COOKIE['user_name']);<br>
echo $user; // Output: 李子<br>
}<br>

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2.3 Parsing Path Parameters in RESTful APIs

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In RESTful APIs, paths may contain URL-encoded content, for example:

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GET /api/file/%E6%96%87%E4%BB%B6.txt

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PHP retrieves the request URI and decodes it:

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<br>
$uri = $_SERVER['REQUEST_URI'];<br>
$fileName = rawurldecode(basename($uri));<br>
echo $fileName; // Output: 文件.txt<br>

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3. Considerations

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Do not apply rawurldecode to data that has already been decoded to avoid double decoding issues.

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When handling HTTP headers, pay attention to security to prevent HTTP header injection attacks.

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After decoding user-input data, it’s best to use functions like htmlspecialchars to prevent XSS attacks.

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4. Conclusion

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rawurldecode combined with HTTP request headers makes it easy to decode URL-encoded parameters. Whether in custom headers, cookies, or RESTful API paths, it has practical use cases. Proper use can improve system compatibility and user experience, while security considerations must always be taken into account.

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