exceeded 4096 byte buffer size

[cronnelly]

Hi,

I found an instance of sniproxy which I run (0.6.0; Ubuntu 22.04) was occasionally failing to proxy TLS requests. In the logs I found lines like the following:

2022-05-12 15:20:54 Request from [::ffff:xx.xx.xx.xxx]:46600 exceeded 4096 byte buffer size

Working on the guess that these requests perhaps have very large HTTP headers, I replaced 4096 with 8192 throughout the codebase, and recompiled sniproxy. Since then, this issue has not reoccurred.

Perhaps this value could be tuneable in the config?

Many thanks!

[renaudallard]

Hi,
Why did you choose 8192?
Header max size is somewhat different between web servers:

Web Server Size Limit
Apache 8K
Nginx 4K-8K
IIS 8K-16K
Tomcat 8K – 48K

[cronnelly]

Hi @renaudallard,

I work with Varnish Cache a lot, which also has an 8K default header limit. So chose that as a figure to test with.

However I didn't really put any more thought into it than that!