Technical SEO

Question 1

Is a 400 Bad Request error dangerous for my computer?

Accepted Answer

No, it’s simply a communication issue between your browser and the web server. It’s not a security risk or a hacking attempt. It’s just a technical hiccup in the request-response cycle.

Question 2

Why do I get 400 errors on just one website but not others?

Accepted Answer

When errors occur on a single site, the issue is likely specific to that site’s request processing or your browser’s interaction with it. You might have corrupted cookies just for that site; they might have stricter validation rules, or your cached data might be incompatible with recent updates. Try clearing cookies for just that specific site.

Question 3

What's the difference between 400, 403, and 404 errors?

Accepted Answer

A 400 error means your request had malformed syntax or invalid parameters. A 403 error means the server understood but refuses to fulfill your request due to permission issues. A 404 error means the server couldn’t find the requested resource at that URL. The page might be moved or deleted.

Question 4

Can VPNs or proxy servers cause 400 Bad Request errors?

Accepted Answer

Yes, VPNs and proxies can trigger these errors. Some websites block known VPN IP addresses, VPNs might modify request headers in ways sites reject, proxy servers might add information that servers can’t process, and security features might interfere with cookies or JavaScript. Try temporarily disabling your VPN to check if that’s the issue.

Question 5

Can mobile data versus Wi-Fi affect 400 Bad Request errors?

Accepted Answer

Yes, different connections can affect these errors. Mobile carriers sometimes use proxies that modify requests, might have different DNS servers, may compress web traffic, and alter request formats, or your phone might have different cached data on different connections. If you experience errors on one connection type but not another, clear your browser data and test both again.

What Is a 400 Bad Request, and How to Fix It?

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