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    <p>jQuery isn't causing a problem here. The issue is that the <code>href</code> property of HTMLAnchorElement (the type of object jQuery is returning), <a href="http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-48250443" rel="nofollow">per the spec</a>, always contains an absolute URI.</p> <p>In HTML5 <code>href</code> is <a href="http://dev.w3.org/html5/spec/urls.html#url-decomposition-idl-attributes" rel="nofollow">a composite attribute</a> and you can just swap the protocol (the part before <code>//</code>) at will by modifying <code>href.protocol</code>, e.g.:</p> <pre><code>var link = $( '&lt;a href="https://example.com/foo"&gt;bar&lt;/a&gt;' )[0]; console.log( link.href ); // =&gt; https://example.com/foo link.href.protocol = 'http:'; console.log( link.href ); // =&gt; http://example.com/foo </code></pre> <p>For older browsers without the composite <code>href</code> you'll just have to make do with a regex:</p> <pre><code>console.log( link.href ); // =&gt; https://example.com/foo link.href = link.href.replace( /^https:/, 'http:' ); console.log( link.href ); // =&gt; http://example.com/foo </code></pre> <p><strong>TLDR:</strong> Your code should look something like this:</p> <pre><code>$( "a[href^='/']" ).prop( "href", function( _idx, oldHref ) { return oldHref.replace( /^https:/, 'http:' ); } ); </code></pre> <p>P.S. You'll notice that I elided your <code>$.each</code> call. That's because <code>prop</code> automatically acts on every element in the matched set, i.e. it already does what you were doing with <code>each</code>.</p> <hr> <blockquote> <h3><a href="http://api.jquery.com/prop/#prop2" rel="nofollow">.prop( propertyName, function(index, oldPropertyValue) )</a></h3> <ul> <li><strong><code>propertyName</code></strong> The name of the property to set.</li> <li><strong><code>function(index, oldPropertyValue)</code></strong> A function returning the value to set. Receives the index position of the element in the set and the old property value as arguments. Within the function, the keyword <code>this</code> refers to the current element.</li> </ul> </blockquote>
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    1. COThe code works but I'm trying to figure out how it does what it's doing. What is _idx?
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    2. COI've quoted (and linked to) the relevant section of the documentation above. `_idx` doesn't have any special meaning in JavaScript, it's just a variable name (it's conventional in some languages to name unused variables just "`_`" but I used it as a prefix instead). All `prop` does in this case is take the value of the given property (`href`) on each matched element, pass it to the anonymous function (as `oldHref` in my code), and then change the property to whatever the function returns. It's similar to [`map`](http://api.jquery.com/jQuery.map/).
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    3. COThanks for the explanation and the fix. I should have checked out the .prop documentation but I was thinking _idx was referencing some type of global variable. This is a nice and elegant fix and I'm going to use it.
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