Why does Request.QueryString["path"] converts all + signs to spaces?

Question

I have a javascript code like this :

function OnRequestComplete(result) {
        // Download the file
        //Tell browser to open file directly
        alert(result);
        var requestImage = "Handler.ashx?path=" + result;
        document.location = requestImage;
}

and Handler.ashx code is like this :

public void ProcessRequest(HttpContext context)
{
    Context = context;
    string filePath = context.Request.QueryString["path"];
    filePath = context.Server.MapPath(filePath);
}

In filePath we don't have any + signs (spaces instead).
How can I solve this issue ?
Why does Request.QueryString["path"] converts all + signs to spaces ?

check this answer: http://stackoverflow.com/questions/123994/querystring-malformed-after-urldecode/124027#124027 — Davide Piras, Oct 23 '11 at 16:59
Querystrings have their own syntax and reserved chars. Encode you filename yourself. — Henk Holterman, Oct 23 '11 at 16:59

score 4 · Accepted Answer · edited May 23 '17 at 12:27

4

When you correctly encode the query string a space becomes + and + becomes %2B. The process of decoding does the reverse, which is why your + gets turned into a space.

The problem is that you didn't encode the query string, and that means it gets decoded incorrectly.

var requestImage = "Handler.ashx?path=" + encodeURIComponent(result);

edited May 23 '17 at 12:27

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answered Oct 23 '11 at 16:57

Mark Byers

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thanks for answer / should i encode that query string in javascript? how? – SilverLight Oct 23 '11 at 16:59

Why does Request.QueryString["path"] converts all + signs to spaces?

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