URI方案的有效字符? [英] Valid characters for URI schemes?

问题描述

我正在考虑将应用程序注册到URL协议，我想知道，方案中允许使用哪些字符?

I was thinking about Registering an Application to a URL Protocol and I'd like to know, what characters are allowed in a scheme?

一些例子:

• h323 (具有数字)
  • h323:[<user>@]<host>[:<port>][;<parameters>]
  • h323 (has numbers)
    • h323:[<user>@]<host>[:<port>][;<parameters>]
    • z39.50r://<host>[:<port>]/<database>?<docid>[;esn=<elementset>][;rs=<recordsyntax>]
    • paparazzi:http:[//<host>[:[<port>][<transport>]]/

    那么，我想使用什么字符?
    我们可以...

    So, what characters can I fancy using?
    Can we have...

    • @:TwitterUser
    • #:HashTag
    • $:CapitalStock
    • ?:ID-10T
    • @:TwitterUser
    • #:HashTag
    • $:CapitalStock
    • ?:ID-10T

    ...根据需要等，还是该方案中的字符受标准限制?

    ...etc., as desired, or characters in the scheme are restricted by standard?

    推荐答案

    根据 RFC 2396 ，附录A:

      scheme        = alpha *( alpha | digit | "+" | "-" | "." )
    

    含义:

    该方案应以字母(大写或小写)开头，并且可以包含字母(大写和小写)，数字，"+"，-"和.".

    The scheme should start with a letter (upper or lower case), and can contains letters (still upper and lower case), number, "+", "-" and ".".

    注意:对于

    paparazzi:http:[//<host>[:[<port>][<transport>]]/
    

    该方案只是狗仔队"的一部分.

    the scheme is only the "paparazzi" part.

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