Trying to understand why we are getting this error HTTP header is larger than 8192 bytes when the request header does not appear to be

Gatling (Open-Source)
1

Hi there

I am running a load test where I am getting this response - org.jboss.netty.handler.codec.frame.TooLongFrameException: HTTP header is larger than 8192 bytes. From the logs (pasted below), we see that there is a Deadlock ( at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [netty-3.10.1.Final.jar:na])

What would this indicate? There are definitely some performance issues on the product side of things, but trying to figure out what is going on here. Also, is there a limit on the response header size?

HTTP request:

GET https://removedurl

headers=

Accept: /

Connection: keep-alive

Content-Type: application/json; charset=utf-8

Authorization: removed

2

Those are securities that are introduced by Netty, but don’t really make sense in the context of Gatling.
We’ll remove them in a future release.
You can change the setting in gatling.conf.

3

Hi Stephane

Thanks for the answer. I am a little unclear on which setting to change in gatling.conf here. Could you guide me? Appreciate all that you do. Gatling rocks

4

Hi Sam,

In Gatling.conf find httpClientCodecMaxHeaderSize under ahc, update the value. This should fix the problem.

httpClientCodecMaxHeaderSize = 16384 # Maximum size, in bytes, of each request’s headers

Regards,
Chandra

5

I see that the config has now been removed, but this execution is still thrown for headers over the default size. I cannot see how to override this config. Please advise what this has been replaced with. Thanks

6

Thanks for reporting.
https://github.com/gatling/gatling/issues/3695

7

Thanks foe confirming.

So are you saying there is no config to work around this issue at present?

Do I need to revert to Gatling 2.3.1 to workaround this for the time being?

Thanks