Create a Delicious Bookmarklet in Firefox using Delicious API

I want to create a Delicious bookmarklet in Firefox that bookmarks the current page with a predefined tag.

For proof of concept, if I enter this url, it works:

https://john:pwd@api.del.icio.us/v1/posts/add?url=http://www.google.com&
    description=http://www.google.com&tags=testtag

But this as a bookmarklet doesn't, I get access denied:

javascript:(

    function()
    {
        location.href = 'https://john:pwd@api.del.icio.us/v1/posts/add?url=' 
            + encodeURIComponent(window.location.href)
            + '&description=' + encodeURIComponent(document.title)   
            + '&tags=testtag';
    }

)()
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Is this possible via a javascript bookmark?

Update: I tried this, but still got the access denied error, so it has something to do with Javascript/Firefox.

javascript:(

    function()
    {
        location.href = 'https://john:pwd@api.del.icio.us/v1/posts/add?url='
            + 'http://www.google.com'
            + '&description=' + 'http://www.google.com' + '&tags=testtag';
    }

)()

Update 2: After trying many variations of the above and on different browsers, I still can't get past the access denied message, so offering a bounty.

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I suspect this is Firefox trying to protect you from security issues when running Javascript. When I tried typing in your example into my address bar, Firefox prompted me to ask if I am sure I want to log in to api.del.icio.us.

This other question concerning HTTP auth looks similar to your question, maybe it will help you.

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Update:

I used Firebug's Net panel and its Javascript console, and I was able to see the request/response headers.

Here is the request from the Javascript console, which FAILED:

GET /v1/posts/add?url=http://www.spoons.com/&description=forks&tags=knives HTTP/1.1
Host: api.del.icio.us
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: https://stackoverflow.com/questions/2708950/2740195
Authorization: Basic XXXXXXXXXXXXXXXXX
Cache-Control: max-age=0

And, here is the request from the address bar, which WORKED:

GET /v1/posts/add?url=http://www.spoons.com/&description=forks&tags=knives HTTP/1.1
Host: api.del.icio.us
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Authorization: Basic XXXXXXXXXXXXXXXXX
Cache-Control: max-age=0

The only difference seems to be the Referer header, which caused the access denied response. The setting network.http.sendRefererHeader in Firefox's about.config can be set to 0 which turns off the Referer header. When I tried this, then the Javascript console method started working.

There is a Firefox extension called refspoof which is useful for sending your own custom Referer headers, maybe that can help here.

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Looks like you're missing url=.