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You can avoid this problem by setting a widely used UA for your web crawler. Many bot-based web scrapers skip the step of defining a UA, with the consequence of being detected and banned for missing the wrong/default UA. If your user agent doesn’t belong to a major browser, some websites will block its requests. So how do you ensure your user agent doesn’t get banned? Tips to avoid getting your UA banned when scraping: #1: Use a real user agent In many cases, the destination web server has it blacklisted and blocks it. However, this causes tools to use a default UA. You may think that the correct solution would be to not include a user agent in your requests. The really sophisticated ones check that the browser behavior actually matches the user agent you claim. More sophisticated websites do this the other way around, i.e., they only allow user agents they think are valid to perform crawling jobs. This is mostly because it identifies the origin as a bot, and certain websites don’t allow bot crawlers or scrapers. When you are web scraping, sometimes you will find that the webserver blocks certain user agents. Put your web scraping on autopilot now! Why should you use a user agent?
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You can learn more about the different strings you can use for the Mozilla browser on their “>developers’ site.īelow you can find examples from Chrome’s developer site of how the UA string format looks for different devices and browsers: Chrome for Android Phone UA: Mozilla/5.0 (Linux )AppleWebKit/ (KHTML, like Gecko) Chrome/Mobile Safari/ Tablet UA: Mozilla/5.0 (Linux )AppleWebKit/(KHTML, like Gecko) Chrome/Safari/ Mozilla offers examples of strings to be used for crawlers: Mozilla/5.0 (compatible Googlebot/2.1 +) Most browsers send a user agent header in the following format, though there’s not much consistency in how user agents are chosen: User-Agent: Mozilla/5.0 () ()Įvery browser adds its own comment components, such as platform or RV (release version). The server can then use this information to adjust the response for the type of device, OS, and browser.
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For example, the string tells the server you are using the Chrome browser and Windows 10 on your computer. The user agent string helps the destination server identify which browser, type of device, and operating system is being used. A user agent (UA) string is a text that the client computer software sends through a request. The term refers to any piece of software that facilitates end-user interaction with web content. Tips to avoid getting your user agent banned when scraping.