可以在 URI 中使用的所有 valid 字符(a URL 是一种 URI) 在 RFC 3986 中定义.

All valid characters that can be used in a URI (a URL is a type of URI) are defined in RFC 3986.

所有其他字符都可以在 URL 中使用，前提是它们首先经过URL 编码".这涉及更改特定代码"的无效字符(通常采用百分号 (%) 后跟十六进制数的形式).

All other characters can be used in a URL provided that they are "URL Encoded" first. This involves changing the invalid character for specific "codes" (usually in the form of the percent symbol (%) followed by a hexadecimal number).

此链接，HTML URL 编码参考，包含无效的编码列表字符.

This link, HTML URL Encoding Reference, contains a list of the encodings for invalid characters.

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