Illegal Header Warnings From Akka HTTP Server

Play Framework
1

We are currently using Play Framework 2.6.15 version with Akka as our http server. Our logs are clogged with illegal header warnings similar to this:

ActorSystemImpl.$anonfun$applyOrElse$2:77 Illegal header: Illegal ‘user-agent’ header: Invalid input ‘/’, expected OWS, ‘EOI’, tchar, product-or-comment or comment (line 1, column 132): Mozilla/5.0 (iPhone; CPU iPhone OS 12_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/16B92 QuantcastSDK/iOS_1.4.2/0nq5uo7apf52qbz4-wg10xs56f0s56tmf

We tried disabling the illegal header warnings using the following settings in the application conf:

play {
  server {
    # The server provider class name
    provider = "play.core.server.AkkaHttpServerProvider"
    akka {
      bindTimeout = 5 seconds
      transparent-head-requests = off
      default-host-header = ""
      max-content-length = infinite
      tls-session-info-header = on
      http {
        parsing {
          max-uri-length = 100k
          illegal-header-warnings = off
        }
      }
    }
  }
}

The warnings still persist. Is there something wrong with the conf file?

2

Might be a little late - you have misconfigured it slightly https://stackoverflow.com/a/36842582/28298

3

I’m not sure in which version of 2.6.x we improved this, but try to use the latest version (2.6.23 at the moment). See this issue for a discussion about it:

Best.