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We have a load balancer on amazon which balance 4 servers. When sending specific HTTP request to the load balancer I get Http error code 400. But when I sends the same request to each one of the servers directly I get Http 200 OK. Other requests are working fine when using the balancer.
Any Ideas?
Thanks.
689
When the backend instance closes a TCP connection to the load balancer before it reaches its idle timeout value, an HTTP 504 error might display. To resolve this, activate keep-alive settings on your backend instances, and then set the keep-alive timeout to a value greater than the load balancer's idle timeout.
ELB 4XX errors HTTP 4XX error codes are generated when clients send faulty or malformed requests to the load balancer. Though potential causes for these errors can be guessed, not much can be done to troubleshoot.
Don't know if this will help you, but I've had a similar problem. I was using jMeter and when accessing my instance over AWS load balancer I would always get: HTTP/1.1 400 BAD_REQUEST. After lot of debugging I found out that I was sending an empty header (no name and no value) because I had an empty row in HTTP Header Manager in jMeter. So, I persume, AWS ELB does some headers checking, and returns HTTP 400, even tough I wasn't having any problems with going with the same request to my instances directly. I don't know if this will help you but you should double-check your headers for some stupid mistake like this one :D
88
I had a similar problem to this, and it was caused by ALB not accepting HTTP methods that are in lower case.
GET http://myhost.com/foo -> HTTP 200
get http://myhost.com/foo -> HTTP 400
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