scala play 2.0 get request header

Question

I am converting some of my java code to scala and I would like to be able to get a specific header and return it as a string.

In java I have:

return request().getHeader("myHeader")

I have been unable to achieve the same thing in scala. Any help would be greatly appreciated! Thanks!

stackoverflow.com/questions/11198998/… also see comments below Travis Brown's answer. — user1253952
– user1253952, Commented Jul 22, 2012 at 6:15

xadhix · Accepted Answer · 2016-08-06 15:48:28Z

9

You could write:

request.get("myHeader").orNull

If you wanted something essentially the same as your Java line. But you don't!

request.get("myHeader") returns an Option[String], which is Scala's way of encouraging you to write code that won't throw null pointer exceptions.

You can process the Option in various ways. For example, if you wanted to supply a default value:

val h: String = request.get("myHeader").getOrElse("")

Or if you want to do something with the header if it exists:

request.foreach { h: String => doSomething(h) }

Or just:

request foreach doSomething

See this cheat sheet for more possibilities.

edited Aug 6, 2016 at 15:48

xadhix

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answered Jul 20, 2012 at 18:57

Travis Brown

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6 Comments

user1253952 Over a year ago

Thanks much! noted that I should handle the null/Option case as well. Perhaps I'm having a more basic issue. I'm getting the error "not found: value request".

Travis Brown Over a year ago

Where are you trying to use it?

user1253952 Over a year ago

In one of my controller files, in a very basic method: def getName = request.get("myHeader")

user1253952 Over a year ago

Using this class (playframework.org/documentation/api/2.0/java/play/mvc/…). If I try to do: println(play.mvc.Http.Request.getHeader("MyHeader")), it will error with the message: "value getHeader is not a member of object play.mvc.Http.Request". Is there a reason I can't use this java object?

Travis Brown Over a year ago

That getHeader method isn't static. You probably want to do something like this.

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Govind Singh · Accepted Answer · 2021-08-02 13:27:40Z

Accepted answer doesn't work for scala with playframework 2.2:

request.get("myHeader").getOrElse("")

It gives me the below error:

value get is not a member of play.api.mvc.Request[play.api.mvc.AnyContent]

use below

request.headers.get("myHeader").getOrElse("")

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