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Compression stripped by Silverline

Brian_Brehart
Altostratus
Altostratus

We've recently experienced slowdowns serving web pages, and here's something we've found:

Apparently, when traffic passes through the WAF, the WAF strips out the following line: Content-Encoding: gzip. We serve pages compressed with GZIP, but, from what we can see, the WAF strips that compression, severely slowing down the page delivery. Does this make sense to anyone, and is there a way to remediate this issue?

 

 

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2 REPLIES 2

NUT2889
Cirrostratus
Cirrostratus

Hi,

 

You can open ticket to F5 Silverline team. TAC team will immediatly help you to identity the problem.

Aaronb
F5 Employee
F5 Employee

F5 Silverline inserts a Via header in all HTTP requests sent to back-end web servers.

  • However, some web servers do not compress data if a request contains a "Via" header.
  • This can lead to longer load times for clients as well as increased bandwidth usage.

Please consult your server documentation for details. 

IIS server:

https://docs.microsoft.com/en-us/iis/troubleshoot/performance-issues/troubleshooting-iis-compression-issues-in-iis6-iis7x

appcmd set config -section:system.webServer/httpCompression /noCompressionForHttp10:"False" /noCompressionForProxies:"False" /commit:apphost

NGINX

https://nginx.org/en/docs/http/ngx_http_gzip_module.html#gzip_proxied

Syntax: gzip_proxied off | expired | no-cache | no-store | private | no_last_modified | no_etag |auth | any ...;

Default:

gzip_proxied off;

Context: http, server, location