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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: 1) by isj on Tuesday July 05 2016, @05:56PM
On a related note, is there some sort of open source bot that I can use/modify, or does everyone just write their own bot, in some awful "lets reinvent the wheel a few hundred times" way? I know some example code out there (indeed what I used initially for mine), but no actual proper project with active development that I can find.
We're using a fork of https://github.com/gigablast/open-source-search-engine/ [github.com] The code (C-style C++) is complex and large, but it offers some features that are hard to find in other projects.
Crawling: I'm not aware of any projects specializing in that, but there must be some simple ones out there based on curl/wget and a bolted-on scheduler.
Indexing and searching: If what you intend to index will be relatively uniform and comparable (and spam-free) and word order does not matter to you, then any of the engines supporting BM25 are faster and simpler.