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If you notice the mentioned response code or other abnormalities during a crawl you should stop it immediately to avoid being black-listed for a much longer period. However, for security reasons servers and applications are sometimes set up to obfuscate the real reason with another error code. Often, when you reach the cut-off threshold the server will respond with 429: Too Many Requests. You should check beforehand with your client (and ask for a whitelist exemption) or attempt to discover a safe rate that will be handled correctly. When dealing with other web platforms such as popular CMSes WordPress and PrestaShop you might find that they have security plugins activated that block or rate-limit requests. #Screaming frog seo spider at screamingfrog.co.uk. trial#Otherwise, you will have to use common sense and trial and error to find out what is an acceptable rate for a particular server. When you have approval from a client to crawl their website you may need to find out if they have this kind of protection turned on, and add your IP address to a whitelist. Such systems are present at any big SaaS platform like Shopify, Wix, etc. Most web hosting providers have built-in crawl and DoS attack prevention systems. If you’re unsure, you can always try the free version first. #Screaming frog seo spider at screamingfrog.co.uk. license#The cost of a single Screaming Frog SEO Spider license is £149 / year and from my experience, it will pay for itself many times over. ![]() There are plenty of other features that you might need, like custom extraction, JavaScript rendering, and various integrations. #Screaming frog seo spider at screamingfrog.co.uk. upgrade#When you upgrade you can use all of the crawl modes including List mode, your crawls are limited in size only by your hardware, and you can save all of them for later. While the free version allows for use of most of the basic functions for up to 500 URLs per crawl, some advanced features that are very useful are restricted. If you’re serious about SEO and crawling, sooner or later you’ll need to get the Paid Version license.
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