API Error: HTTP 400 error.

Hello,

We apologize for the issue you are facing with the API Error: HTTP 400 while running the SEO Analyzer. Since you’ve already checked the common suggestions, let’s explore some potential reasons for this error:

1. Website Under Maintenance: Ensure that your website is not in maintenance mode. If it is, switch it back to normal mode.
   

2. Check Website Status: Verify that your website is returning a 200 status code. You can check the status of your website using this tool.
   

3. API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout error.

4. API Requests Blocked by Firewall: Check if your server’s firewall is blocking our API requests. If so, you may need to whitelist the IP 46.30.211.100 and the user-agent RankMathApi/2.0.2; https://rankmath.com.

5. Locally Hosted Website: The SEO Analyzer only works on live sites that return a 200 OK status when crawled from an external site. If your site is hosted locally, this could be the reason for the error.
   

If none of these solutions resolve the issue, please reply to this ticket, and a human agent from the Rank Math Support team will take over and assist you further.

Thank you for raising this concern, and we hope to help you get this resolved soon!

Sources:
Why Am I Getting "API Error: HTTP 400" Error » Rank Math

Hello,

Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.

Can you please share your website URL where the issue is happening?

Looking forward to helping you.

Hi there,

We attempted to use the Rank Math external SEO Analyzer tool, but it seems that our server was unable to reach yours.

This indicates that your server might be blocking our server from analyzing your website. Could you please contact your web hosting company and ask them to whitelist the IP address 46.30.211.100 and the following user-agent to see if that resolves the issue:

RankMathApi/2.0.2; https://rankmath.com

Please keep us updated on the progress. We’re here to help you.

Thank you.

Hello,

We tested the website with our external SEO Analyzer again and are still getting the ‘Invalid server response’

You can ask your hosting provider to look into it and whitelist those IP addresses we shared earlier. And you should whitelist the same IP if you are using Cloudflare.

Also, check with your host and share your server & site’s IP addresses so we can check if your site is getting blocked from our end.

Don’t hesitate to get in touch if you have any other questions.

Hello,

We have checked your IP against our logs, and there’s nothing blocking it from our end. The issue may be on your end or your server/host’s end.

You can also try deactivating all your plugins except Rank Math and activating a WordPress default theme. Then, try using the external SEO analyzer tool again via https://rankmath.com/tools/seo-analyzer/ and let us know the result.

We look forward to hearing back from you.

Hello,

Yes, you can do that without affecting the live site.

Please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/

Here is a video you can follow as well: https://www.youtube.com/watch?v=FcIWRhacUP2c

Only the site admin would know and your users won’t be affected by this troubleshooting.

Let us know how this goes.

Thank you.

Hello,

Can you also please check with your hosting provider if the user-agent RankMathApi/2.0.2; https://rankmath.com is also whitelisted?

At the moment, our server is not blocking your site so something must be still blocking your website server.

Let us know how that goes.