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Encoding a Query String

From: Thomson James <James.Thomson@jeyes.co.uk>
Date: Thu, 1 Mar 2001 10:29:33 -0000
Message-ID: <CD7972E0A701D5119B8C00A0C945437403A5D1@hyperion.jeyes.co.uk>
To: "HTTP List (E-mail)" <www-talk@w3.org>
Hi,

I'm writing a small class to deal URI with query-string encoding/decoding.
I'm a bit unsure however as to what needs to be encoded/decoded and what
doesn't. I've had a look at several classes on the net and they all seem to
do it a little differently.

I've grabbed this relevant section from the HTTP 1.1 spec:

query          = *( uchar | reserved )

pchar          = uchar | ":" | "@" | "&" | "=" | "+"
uchar          = unreserved | escape
unreserved     = ALPHA | DIGIT | safe | extra | national

escape         = "%" HEX HEX
reserved       = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+"
extra          = "!" | "*" | "'" | "(" | ")" | ","
safe           = "$" | "-" | "_" | "."
unsafe         = CTL | SP | <"> | "#" | "%" | "<" | ">"
national       = <any OCTET excluding ALPHA, DIGIT,
                 reserved, extra, safe, and unsafe>


Lets say I wish to send the following set of name/value pairs:

name = Mr Joe G. Bloggs
houseno = #16
salary = $50,000

For the internet explorer implementation of the encoding I get the
following:

?name=Mr%20Joe%20G.%20Bloggs&houseno=%2316&%2450%2C000

So it encodes safe "$" but not the safe ".", is this correct?

Generally, I would assume that everything needs to be encoded except for the
safe characters, is this right and is IE's implementation wrong? I read that
you MUST encoded the unsafe/reserved characters etc, but you MAY encode any
others, would this mean IE's implementation is correct?

If your interested, I'm using the Microsoft JScript 5.5 Engine's
encodeURIComponent() function to test these query-strings.

Thanks,

Jim.


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Received on Thursday, 1 March 2001 06:03:42 GMT

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