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Disclaimer: I work on a search engine (findx). I try not to put competitors in a bad light.
Question: Should a web crawler always reveal its true name?
Background: While crawling the web I've found some situations where using a fake user-agent might help. First example is a web site that checks the user-agent in the http-request and returns a "your browser is not supported" - even for robots.txt. Another example is a site that had an explicit whitelist in robots.txt. Strangely, 'curl' was whitelisted but 'wget' was not. I hesitate in using a fake user-agent, e.g. googlebot because it isn't clear what the clueless webmasters' intentions are. It appears that some websites are misconfigured or so google-optimized that other/new search engines may have to resort to faking user-agent.
I'm also puzzled by Qwant because they claim to have their own search index but my personal website (which is clearly indexed when I search in qwant) has never been crawled by a user-agent resembling anything that could lead to qwant. Apparently they don't reveal what their user-agent is: https://blog.qwant.com/qwant-fr/. And there has been some discussion about it: https://www.webmasterworld.com/search_engine_spiders/4743502.htm
This is different from search engines that don't have their own index (eg. DuckDuckGo uses results from Yahoo! and yandex. Startpage uses Google, etc.)
So what do you Soylentils say, is faking the user-agent in webcrawls necessary? Acceptable? A necessary evil?
(Score: 4, Interesting) by Bill Dimm on Tuesday July 05 2016, @02:00PM
That said, robots.txt is a nonsense too. You really think that it's going to stop your stuff being found, especially if you end up having to list "what not to look at".
No, I don't think it will stop the content from being found, but it will tell a well-behaved bot that it would be stupid to try to index it. If they insist on trying to index it anyway, what will stop them is when I ban their IP address from accessing the site at all. There are plenty of legitimate reasons for indicating that some pages shouldn't be indexed -- the content may be temporary, or it may be highly redundant (e.g., a list of links to similar articles). If your bot decides to plow through it anyway, despite the site owner who understands the content much better than your bot going to the trouble to tell your bot what is useful to index and what isn't, you are just demonstrating that your bot isn't worth tolerating at all.