akka-http / routing DSL: How to set response content type?

[Jo Kade]

What is the intended way to set the response content type from within a route?
In spray there is a respondWithMediaType() directive, but akka-http has not (yet?).
I cannot use respondeWithHeader(`Content-Type`()) since it has a package-private constructor,
and using RawHeader("Content-Type","text/html") results in an error. Thanks,

Best regards,

Johannes

[Björn Antonsson]

Hi Johannes,

It seems like there is a mismatch here. The only way that I can find is to use the Java API like this

respondWithHeaders(akka.http.model.japi.headers.ContentType.create(ContentType(`text/html`)))

I've opened a ticket here https://github.com/akka/akka/issues/16523

B/

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Björn Antonsson

Typesafe – Reactive Apps on the JVM

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[Björn Antonsson]

Hi again Johannes,

Mathias was kind enough to educate me in the ticket that the respondWithMediaType way of doing things has been removed since it was considered an antipattern and you should now use the Marshalling infrastrucutre instead to acheive the same results.

Please take a look at akka.http.marshalling.Marshaller. You can use the PredefinedToEntityMarshallers and change the content type with the wrap method on the marshaller.

B/

[Jo Kade]

Hi Björn,

thanks for the reply; however, although this solution compiles, I get a runtime warning:

Explicitly set HTTP header 'Content-Type: text/html' is ignored, explicit `Content-Type` header is not allowed.
Set `HttpResponse.entity.contentType` instead.

-- Johannes

[André]

Hi Jo,

as Björn and Mathias exlained there's no need to set the Content-Type explicitly. Just import ScalaXmlSupport and complete with a NodeSeq (example) or alternatively implicitly define a string marshaller for text/html and complete with a String.

What exactly did you try to trigger this warning?