How to set akka.http server settings?

[Leo Haskin]

I am trying to change the max-uri-length setting (http://doc.akka.io/docs/akka-http/10.0.7/scala/http/configuration.html), I tried adding the following setting to the run command:

-Dakka.http.server.parsing.max-uri-length=3k 

-Dplay.server.akka.http.server.parsing.max-uri-length=3k

-Dplay.server.parsing.max-uri-length=3k

I keep getting the same error when passing a URL longer than 2048:

[akka.actor.ActorSystemImpl(play-dev-mode)] Illegal request, responding with status '414 Request-URI Too Long': URI length exceeds the configured limit of 2048 characters

Is there any way to change this setting in the akka http server?

Thank you!

Leo

[Leszek]

Please check here: https://www.playframework.com/documentation/2.6.x/SettingsAkkaHttp

Altough, I don't see any URI related settings.

[Leo Haskin]

I did read that section, and as I said, I tried to set the setting in those three ways:

-Dakka.http.server.parsing.max-uri-length=3k 

-Dplay.server.akka.http.server.parsing.max-uri-length=3k

-Dplay.server.parsing.max-uri-length=3k

but neither worked.

[Justin du coeur]

I don't know how the internals of Akka-HTTP work, but keep in mind that 3k URLs are pretty strongly discouraged in general.  As a rule of thumb, browsers start to crap out when a URL goes above roughly 2k, and that is often treated as a de facto maximum URL length in many systems.  It wouldn't astonish me if that (deliberately or accidentally) got baked into Akka-HTTP somewhere...

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[Leo Haskin]

FYI for others that may stumble on this, the solution was:

-Dakka.http.parsing.max-uri-length=16k

Furthermore, I found that this setting does not work if added to application.conf, at least not when running in development mode.  It must be used on command line.