Bot signals · Web crawler
What is NewsBlur Fetcher?
NewsBlur is a personal news reader with web and native apps. Its fetcher collects new stories from the sites and RSS sources NewsBlur users follow, and can follow a site without RSS by watching its pages for changes.
01 · Profile
NewsBlur Fetcher at a glance.
What to look for in your logs, and what the lookup API returns for its addresses.
- Type
- Web crawler
- API flag
risk.is_crawler
A user agent alone never sets a flag. Anyone can claim to be NewsBlur Fetcher; the flag follows the address the request comes from.
02 · In the response
What a match looks like.
A lookup of a NewsBlur Fetcher address sets risk.is_crawler. The flags come with geolocation and network data in the same response, for API keys on every paid plan.
The response says which kind of bot an address belongs to, not which operator. A request that claims to be NewsBlur Fetcher while risk.is_crawler is false should not be trusted as NewsBlur Fetcher.
{
// … location and network fields …
"risk": {
"is_ai": false,
"is_crawler": true,
"is_scanner": false
}
}
03 · Control
Allow or block NewsBlur Fetcher.
Your options
- robots.txt works only for crawlers that choose to follow it. Check the operator’s documentation for the token it reads.
- Firewall, WAF or CDN. Many offer bot rules you can allow or deny by category. Use them to enforce what robots.txt only asks for.
- In your app. Look up the client address and allow or deny on
risk.is_crawler, alongside the user agent. - Never on the user agent alone. Blocking the name stops only honest clients; allowing it lets anyone in who borrows it.
04 · Questions
About NewsBlur Fetcher.
What is NewsBlur Fetcher?
NewsBlur is a personal news reader with web and native apps. Its fetcher collects new stories from the sites and RSS sources NewsBlur users follow, and can follow a site without RSS by watching its pages for changes.
How do I block NewsBlur Fetcher?
Deny it at your firewall, WAF or CDN, or look up each client address and deny requests where risk.is_crawler is true. Do not rely on the user agent alone.
Can I trust a request that says it is NewsBlur Fetcher?
Not on the user agent alone: any client can send a bot’s name in its user agent. A user agent alone never sets a flag. Check the address with the free bot checker or the lookup API.
Which risk flag does NewsBlur Fetcher set?
Its addresses set risk.is_crawler in the lookup response. The risk flags come with every paid plan.
From the blog
Go deeper.
Related bots
Recognise NewsBlur Fetcher on every request.
is_ai, is_crawler and is_scanner in every lookup, on every paid plan, from 9,00 € a month (VAT included).