Bad Request - server could not understand.

#1
Bad Request
Your browser sent a request that this server could not understand.


Many times, users getting this message whereas when they refresh the same page, page works. What will be possible reason?
 
#3
Just try to access below URLs you will observe the issue. Refresh the same URL 2-3 times.. it will start working the same URL again. But why 400 Error coming not able to find it.

https://webrunnr.com/contact-us

Click on random pages. I am sure you get the error as I am getting. Even monitoring tools like uptime also reporting the same but again within minutes they also report URL working.

No error in logs.
 

Pong

Administrator
#4
400 Bad Request Error: What It Is and How to Fix It https://airbrake.io/blog/http-errors/400-bad-request

Since the 400 Bad Request Error is a client error response code, it’s best to start by troubleshooting any potential client-side issues that could be causing this error.

400 should show up in error log similar to:
2018-04-16 14:27:24.707114 NOTICE [162.*.*.*:20689] Status 400: Http request header is too big, abandon!
2018-04-16 14:27:30.324454 NOTICE [108.*.*.*:25277] Status 400: Http request header is too big, abandon!
2018-04-16 14:27:30.753616 NOTICE [108.*.*.*:11391] Status 400: Http request header is too big, abandon!
2018-04-16 14:31:04.983279 NOTICE [172.*.*.*:27043] Status 400: Http request header is too big, abandon!
2018-04-16 14:31:09.189628 NOTICE [172.*.*.*:36797] Status 400: Http request header is too big, abandon!
2018-04-16 14:31:14.921465 NOTICE [162.*.*.*:9799] Status 400: Http request header is too big, abandon!
2018-04-16 14:31:16.782820 NOTICE [162.*.*.*:15187] Status 400: Http request header is too big, abandon!
 
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