Comment by Firefishy
1 month ago
Disclosure: I am part of the mostly volunteer run OpenStreetMap ops team.
Technically we able to block and restrict the scrapers after the initial request from an IP. We've seen 400,000 IPs in the last 24 hours. Each IP only does a few requests. Most are not very good at faking browsers, but they are getting better. (HTTP/1.1 vs HTTP/2, obviously faked headers etc)
The problem has been going on for over a year now. It isn't going away. We need journalists and others to help us push back.
Hey. I run a small community forum and I've been dealing with this exact same kind of behaviour where well over 99% of requests are bad crawlers. There used to be plenty of "tells" for the faked browsers, HTTP/1.1 being a huge one. As you said, however, they're getting a bit smarter about that and it's becoming increasingly difficult to differentiate it from legitimate traffic.
It's been getting worse over the past year, with the past few weeks in particular seeing a massive change literally overnight. I had to aggressively tune my WAF rules to even remotely get things under control. With Cloudflare I'm aggressively issuing browser challenges to any browser that looks remotely suspicious, and the pass rate is currently below 0.5%. For my users' sake, a successful browser challenge is "valid" for over a month, but this still feels like another thing that'll eventually be bypassed.
I'd be keen to know if you've found any other effective ways of mitigating these most recent aggressive scraping requests. Even a simple "yes" or "no" would be appreciated; I think it's fair to be apprehensive about sharing some specific details publicly since even a lot of folks here on HN seem to think it's their right to scrape content with orders of magnitude higher throughput than all users combined.
I really don't know how this is sustainable long-term. It's eaten up quite a lot of my personal time and effort just for the sake of a hobby that I otherwise greatly enjoy.
I hear ya. This is just my opinion but I don't think journalists are going to be much help. The bots would have to be hurting something belonging to the government or the government is paying for to really get them on it. e.g. some big orgs in the government embed your maps on their site. They would have to create legislation and then someone would have to trace the bots back to their operator for attribution and then someone would have to file lawsuits against them once it is illegal. Or you could try using a ToS/AuP to go after them assuming attribution. I am not a lawyer.
I think your only hope would be to either find subtle differences between them and real legit users or change how your site works so that bots have to be authenticated unless they have a whitelisted IP/CIDR or put your site behind something else that spots the bots. Beyond that all anyone can do is beef up their infrastructure to handle much more than the bots could dish out.
Have you tried silly simple things like hidden javascript puzzles the browser has to solve?