http - Is there a spec for nested urlencoded params[]? -


at 1 point in history, server side languages started tweaking urlencoded parameters add support submitting data arrays , key/value objects:

// key/value pairs contact[name]=john contact[phone]=800-555-1234  // arrays foo[]=bar foo[]=baz

i’m playing around edge cases in 1 library's nested parameter parsing, eg preservation of parameter order. there spec formalizes how server should process encoding? if not, reference implementation introduced syntax?

square brackets in uris

according rfc-3986 "uniform resource identifier (uri): generic syntax" using unencoded square brackets in uris isn't allowed. therefore it's not http standard.

a host identified internet protocol literal address, version 6 [rfc3513] or later, distinguished enclosing ip literal within square brackets ("[" , "]"). place square bracket characters allowed in uri syntax.

many programming languages using square brackets arrays, therefore guess natural carry-over use square brackets in uris.

is there spec formalizes how server should process encoding?

no, @ least not language independent.

first implementation

a lot of web application frameworks allow reuse of same key in query create array, example http://example.org/?foobar=hello&foobar=world. these frameworks allow use square brackets in keys, makes no difference, part of name. associative arrays supported. (caveat: i'm not familiar languages.)

  • perl, 1987: numbered arrays supported, not associative arrays.
  • php, 1995: supports numbered arrays associative arrays.
  • active server pages (asp), 1996: numbered arrays supported, not associative arrays.
  • javaserverpages (jsp), 1999: numbered arrays supported, not associative arrays.
  • jax-rs (java), 2008: numbered arrays supported, not associative arrays.

so far php language i've found, supports associative arrays in urls without custom code.


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