What is the purpose of encoding the Jquery Ajax URL twice?

In my JavaScript code, I am utilizing the jQuery ajax function.

Here is an example of how it appears:

$.ajax({
   url: "somepage/" + keyword + "/" + xyz + "/" + abc + "/getbla",
(...)

If the 'keyword' (value from a textfield) includes a '#', the functionality stops working. As we know, URLs only parse until the '#' symbol and treat the rest as an anchor.

To address this issue, I updated the ajax function like so:

$.ajax({
   url: "somepage/" + encodeURIComponent(keyword) + "/" + xyz + "/" + abc + "/getbla",
(...)

Even though this modification did not resolve the problem, checking the console revealed that the URL now showcases '%23' instead of '#'.

Although this was progress, the request still fails to work - perplexing me and leading me to seek help here.

After entering '%23' in the textfield (keyword), the request performs perfectly fine. The PHP backend retrieves the desired data.

My ultimate solution involved double-encoding the keyword in the ajax function:

$.ajax({
   url: "somepage/" + encodeURIComponent(encodeURIComponent(keyword)) + "/" + xyz + "/" + abc + "/getbla",
(...)

This is the structure of the related PHP function:

if ($_GET['anyparam'] == 'getbla') {

    $searchString = array(
        'keyword' => trim($_POST['keyword']),
        'xyz' => trim($_POST['xyz']),
        'abc' => trim($_POST['abc'])
    );

    echo json_encode($this->dataBaseFunctions->searchResult($searchString['keyword'], $searchString['xyz'], $searchString['abc']));
  }

Question: Why is it necessary to encode the URL twice?

Answer №1

It seems like your website may be using URL rewriting, where the initial request passes through and the "#" is decoded. However, when redirected, everything after the hash symbol is disregarded.
In cases of double encoding, the first request will decode to "%23", and then redirect to "#".

If you are utilizing mod_rewrite, I recommend checking out https://httpd.apache.org/docs/2.4/rewrite/flags.html#flag_b

Answer №2

This regulation seems to meet my requirements:

RewriteRule ^specificpage/([^/]+)/([0-9]+)/?$ specificpage&parameter1=${unescape:$1}&parameter2=$2 [L]

Answer №3

According to this source, the URL you're inputting without utilizing encodeURIComponent may seem fine at first, but it needs to be encoded twice in order to become correct. Encoding it only once actually renders it incorrect.

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