![]() ![]() ![]() Non-Indexable Canonical – The canonical URL is a non-indexable page.This can lead to unpredictability, as there should only be a single canonical URL set by a single implementation (link element, or HTTP header) for a page. Multiple – There’s multiple canonicals set for a URL (either multiple link elements, HTTP header, or both combined).This can lead to ranking unpredicatability, and hence generally all URLs should specify a canonical version. If a page doesn’t indicate a canonical URL, Google will identify what they think is the best version or URL. ![]() Missing – There’s no canonical URL present either as a link element, or via HTTP header.In a perfect world, a website wouldn’t need to canonicalise any URLs as only canonical versions would be linked to, but often they are required due to various circumstances outside of control, and to prevent duplicate content. This means the search engines are being instructed to not index the page, and the indexing and linking properties should be consolidated to the target canonical URL. The URL is ‘canonicalised’ to another location. Canonicalised – The page has a canonical URL that is different to itself.Ideally only canonical versions of URLs would be linked to internally, and every URL would have a self-referencing canonical to help avoid any potential duplicate content issues that can occur (even naturally on the web, such as tracking parameters on URLs, other websites incorrectly linking to a URL that resolves etc). Self Referencing – The URL has a canonical which is the same URL as the page URL crawled (hence, it’s self referencing).This could be a self-referencing canonical URL where the page URL is the same as the canonical URL, or it could be ‘canonicalised’, where the canonical URL is different to the page URL. Contains Canonical – The page has a canonical URL set (either via link element, HTTP header or both).In the image below, we can see there’s 1 URL that’s ‘canonicalised’ and 1 URL that has a ‘Non-Indexable Canonical’. The right hand overview window pane provides a summary of data contained within each tab and filter, so you know where to click, without having to check each filter to see if there’s data. The ‘Occurences’ column counts the number of rel=”canonical” elements that has been discovered for each URL. The canonicals tab has 6 filters that help you understand your canonical implementation, and identify common canonical problems. The Canonicals tab shows all URLs found in a crawl and their corresponding rel=”canonical” link elements and HTTP Canonicals in seperate corresponding columns in the main window pane. Now grab a coffee and wait until the progress bar reaches 100%, and the crawl is completed. The website and any URLs within rel=”canonical” elements will be crawled. Open up the SEO Spider, type or copy in the website you wish to crawl in the ‘Enter URL to spider’ box and hit ‘Start’. This will mean URLs referenced in rel=”canonical” will be crawled, as well as extracted and reported. The SEO Spider ‘Configuration’ is available in the top level menu. This option is enabled by default, so unless you have adjusted the configuration this will already be set-up. 1) Ensure ‘Store’ & ‘Crawl’ Canonicals are Enabled under ‘Configuration > Spider > Crawl’ You can download via the buttons in the right hand side bar. To get started, you’ll need to download the SEO Spider which is free in lite form, for crawling up to 500 URLs. The SEO Spider will crawl canonical link elements found in the HTML and HTTP Headers and report upon their set-up and common errors. This tutorial walks you through how you can use the Screaming Frog SEO Spider to audit canonical implementation quickly and efficiently across a website. It’s a hint to the search engines to help prevent duplicate content, by consolidating indexing and link properties to a single URL to use in ranking. The rel=”canonical” element helps specify a single preferred version of a page when it’s available via multiple URLs. How To Audit Canonicals Using The SEO Spider
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