I'm trying to write a Java class to log in to a certain website. The data sent in the POST request to log in is
user%5Blogin%5D=username&user%5Bpassword%5D=123456
I'm curious what the %5B and %5D means in the key user login.
How do I decode these data?
8 Answers
As per this answer over here: str='foo%20%5B12%5D' encodes foo [12]:
%20 is space
%22 is quotes
%5B is '['
and %5D is ']'This is called percent encoding and is used in encoding special characters in the url parameter values.
EDIT By the way as I was reading , it just occurred to me why so many people make the same search. See the note on the bottom of the page:
Also note that if one wishes to follow the more recent RFC3986for URL's, making square brackets reserved (for IPv6) and thus not encoded when forming something which could be part of a URL (such as a host), the following may help.
function fixedEncodeURI (str) { return encodeURI(str).replace(/%5B/g, '[').replace(/%5D/g, ']');
}Hopefully this will help people sort out their problems when they stumble upon this question.
0They represent [ and ]. The encoding is called "URL encoding".
[] is replaced by %5B%5D at URL encoding time.
Well it's the usual url encoding
So they stand for [, respectively ]
To find out these values you can simply use Console in your browser and do the following
console.log(decodeURI('user%5Blogin%5D=username&user%5Bpassword%5D=123456'))To take a quick look, you can percent-en/decode using this online tool.
2The data would probably have been posted originally from a web form looking a bit like this (but probably much more complicated):
<form action="" method="post"> User login <input name="user[login]" /><br /> User password <input name="user[password]" /><br /> <input type="submit" />
</form>If the method were "get" instead of "post", clicking the submit button would take you to a URL looking a bit like this:
or:
The web server on the other end will likely take the user[login] and user[password] parameters, and make them into a user object with login and password fields containing those values.
Not least important is why these symbols occur in url. See , specifically:
parse_str('foo[]=1&foo[]=2&foo[]=3', $bar);the above produces:
$bar = ['foo' => ['1', '2', '3'] ];and what is THE method to separate query vars in arrays (in php, at least).
