web-crawler

How to programmatically fill input elements built with React?

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This accepted solution appears not to work in React > 15.6 (including React 16) as a result of changes to de-dupe input and change events. You can see the React discussion here: https://github.com/facebook/react/issues/10135 And the suggested workaround here: https://github.com/facebook/react/issues/10135#issuecomment-314441175 Reproduced here for convenience: Instead of input.value=”foo”; input.dispatchEvent(new Event(‘input’, {bubbles: true})); You would use function setNativeValue(element, … Read more

how to totally ignore ‘debugger’ statement in chrome?

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To totally ignore all breakpoints in Chrome, you must do as follows: Open your page in the Chrome browser. Press F12 or right-click on the page and select Inspect. In the Source panel, press Ctrl+F8 to deactivate all breakpoints. (or: At the top-right corner, select deactivate breakpoints.) All breakpoints and debugger statements will be deactivated. … Read more

how to filter duplicate requests based on url in scrapy

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You can write custom middleware for duplicate removal and add it in settings import os from scrapy.dupefilter import RFPDupeFilter class CustomFilter(RFPDupeFilter): “””A dupe filter that considers specific ids in the url””” def __getid(self, url): mm = url.split(“&refer”)[0] #or something like that return mm def request_seen(self, request): fp = self.__getid(request.url) if fp in self.fingerprints: return True … Read more

Automated link-checker for system testing [closed]

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We use and really like Linkchecker: http://wummel.github.io/linkchecker/ It’s open-source, Python, command-line, internally deployable, and outputs to a variety of formats. The developer has been very helpful when we’ve contacted him with issues. We have a Ruby script that queries our database of internal websites, kicks off LinkChecker with appropriate parameters for each site, and parses … Read more

Detecting honest web crawlers

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You said matching the user agent on ‘bot’ may be awkward, but we’ve found it to be a pretty good match. Our studies have shown that it will cover about 98% of the hits you receive. We also haven’t come across any false positive matches yet either. If you want to raise this up to … Read more

Node.JS: How to pass variables to asynchronous callbacks? [duplicate]

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Your url variable is not scoped to the for loop as JavaScript only supports global and function scoping. So you need to create a function scope for your request call to capture the url value in each iteration of the loop by using an immediate function: var links = [‘http://google.com’, ‘http://yahoo.com’]; for (link in links) … Read more