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POXSLT in Chrome extension: Unsafe attempt to load URL
 

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    <p>I'm writing a Chrome extension which should apply XSLT transform to certain XML documents on the fly. Just for testing I use the following XML and XSL files:</p> <p><strong>XML:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;WebServiceMessage&gt; &lt;status&gt;timeout&lt;/status&gt; &lt;message&gt;Nameserver%2520not%2520registered.&lt;/message&gt; &lt;stepName&gt;Finish&lt;/stepName&gt; &lt;stepNumber&gt;11&lt;/stepNumber&gt; &lt;maxStepNumber&gt;11&lt;/maxStepNumber&gt; &lt;percent&gt;100&lt;/percent&gt; &lt;session&gt;2fc0f139b88a800151e5f21b9d747919&lt;/session&gt; &lt;/WebServiceMessage&gt; </code></pre> <p><strong>XSL:</strong></p> <pre><code>&lt;?xml version="1.0" ?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:template match="/"&gt; &lt;html&gt;&lt;head&gt;&lt;/head&gt; &lt;body&gt; &lt;xsl:apply-templates/&gt; &lt;/body&gt; &lt;/html&gt; &lt;/xsl:template&gt; &lt;xsl:template match="*"&gt; &lt;xsl:for-each select="*"&gt; &lt;p&gt;&lt;b&gt;&lt;xsl:value-of select ="name(.)"/&gt;&lt;/b&gt;: &lt;span&gt;&lt;xsl:attribute name="id"&gt;&lt;xsl:value-of select ="name(.)"/&gt;&lt;/xsl:attribute&gt;&lt;xsl:value-of select="."/&gt;&lt;/span&gt;&lt;/p&gt; &lt;/xsl:for-each&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>The tranfromation works normally if it's linked inside a test XML file itself, that is via:</p> <pre><code>&lt;?xml-stylesheet type="text/xsl" href="message.xsl"?&gt; </code></pre> <p>The extension should inject the same xsl link into XML-files.</p> <p><strong>manifest.json:</strong></p> <pre><code>{ "permissions": ["tabs", "&lt;all_urls&gt;"], "content_scripts": [ { "matches": ["&lt;all_urls&gt;"], "js" : ["contentscript.js"] } ], "web_accessible_resources": [ "message.xsl" ], "manifest_version": 2 } </code></pre> <p><strong>contentscript.js:</strong></p> <pre class="lang-js prettyprint-override"><code>(function() { if(document.xmlVersion != null) { var e = document.createProcessingInstruction( "xml-stylesheet", "type='text/xsl' href='" + chrome.extension.getURL("message.xsl") + "'"); document.insertBefore(e, document.firstChild); } })(); </code></pre> <p><strong>The problem</strong></p> <p>Chrome outputs the following error into console:</p> <p><em>Unsafe attempt to load URL <code>chrome-extension://ladfinoepkgipbeooknnklpakoknohjh/message.xsl</code> from frame with URL <code>http://localhost/out.xml</code>. Domains, protocols and ports must match.</em></p> <p>How to fix this? I saw some reports on the Internet related to similar errors, which seems like a bug in Chrome.</p> <p>I placed the xsl-file on the web-server as well, and changed styleheet link to the web-server. Still the same error:</p> <p><em>Unsafe attempt to load URL <code>http://localhost/message.xsl</code> from frame with URL <code>http://localhost/out.xml</code>. Domains, protocols and ports must match.</em></p> <p>Apparently domains, protocols, and ports <strong>do match</strong>.</p>
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    1. COI guess it is a [security feature of chrome](http://blog.chromium.org/2008/12/security-in-depth-local-web-pages.html).
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    2. COI used this code without any problem, maybe it's only when you update the `window.document` that it does it: `var documentString = document.firstChild.innerHTML; var docu = new DOMParser().parseFromString('<xml>'+documentString+'</xml>', application/xml"); var e = docu.createProcessingInstruction("xml-stylesheet", "type='text/xsl' href='" + chrome.extension.getURL("message.xsl") + "'"); docu.insertBefore(e, docu.firstChild);`
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    3. CO@jjperezaguinaga You have created a new document instead of existing one. In a sense, this is the same as a workaround I posted below.
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