有嵌套的urlencoded参数[]规范吗? [英] Is there a spec for nested urlencoded params[]?

问题描述

在历史的某一时刻，服务器端语言开始调整urlencoded参数，以增加对将数据提交为数组和键/值对象的支持:

At one point in history, server side languages started tweaking urlencoded parameters to add support for submitting data as arrays and key/value objects:

// key/value pairs
contact[name]=John
contact[phone]=800-555-1234

// arrays
foo[]=bar
foo[]=baz

我正在一个库的嵌套参数解析中处理一些极端情况，例如保留参数顺序.是否有规范化服务器应如何处理此编码的规范?如果没有，哪个参考实现引入了这种语法?

I’m playing around with some edge cases in one library's nested parameter parsing, eg preservation of parameter order. Is there a spec that formalizes how a server should process this encoding? If not, which reference implementation introduced this syntax?

推荐答案

URI中的方括号

根据 RFC-3986统一资源标识符(URI):通用语法"不允许在URI中使用未编码的方括号.因此，这不是HTTP标准.

According to RFC-3986 "Uniform Resource Identifier (URI): Generic Syntax" using unencoded square brackets in URIs isn't allowed. Therefore it's not a HTTP standard.

由Internet协议文字地址版本6 [RFC3513]或更高版本标识的主机通过将IP文字括在方括号("["和]")中来区分.这是URI语法中唯一允许使用方括号字符的地方.

A host identified by an Internet Protocol literal address, version 6 [RFC3513] or later, is distinguished by enclosing the IP literal within square brackets ("[" and "]"). This is the only place where square bracket characters are allowed in the URI syntax.

许多编程语言都在数组中使用方括号，因此我想在URI中使用方括号是很自然的做法.

Many programming languages are using square brackets for arrays, therefore I guess it was a natural carry-over to use square brackets in URIs.

是否存在规范化服务器应如何处理此编码的规范?

Is there a spec that formalizes how a server should process this encoding?

不，至少不独立于语言.

No, at least not language independent.

首次实施

许多Web应用程序框架都允许重用查询中的相同键来创建数组，例如 http://example.org/?foobar=hello&foobar=world .这些框架还允许在键中使用方括号，但这没什么区别，它们只是名称的一部分.很少支持关联数组.(注意:我对所有这些语言都不熟悉.)

A lot of web application frameworks allow reuse of the same key in the query to create an array, for example http://example.org/?foobar=hello&foobar=world. These frameworks also allow to use square brackets in keys, but it makes no difference, they are just part of the name. Associative arrays are rarely supported. (Caveat: I'm not familiar with all this languages.)

• Perl，1987年:支持数字数组，但不支持关联数组.
• PHP，1995:支持带编号的数组以及关联数组.
• Active Server Pages(ASP)，1996:支持带编号的数组，但不支持关联数组.
• JavaServerPages(JSP)，1999:支持带编号的数组，但不支持关联数组.
• JAX-RS(Java)，2008:支持编号数组，但不支持关联数组.

到目前为止，PHP是我发现的唯一语言，它支持URL中的关联数组，而无需自定义代码.

So far PHP is the only language I've found, which supports associative arrays in URLs without custom code.

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