How to set contentType to applicaton/json with ktor client? I tried both `headers[HttpHeaders.Conten...

# ktor

[coletz]

How to set contentType to applicaton/json with ktor client? I tried both headers[HttpHeaders.ContentType] = ContentType.Application.Json.toString() and contentType(ContentType.Application.Json) but I get an exception: io.ktor.http.UnsafeHeaderException: Header Content-Type is controlled by the engine and cannot be set explicitly. How to set it with the engine? Considering I'm using ios so I'm not sure I can use ktor-client-json

[Deactivated User]

https://ktor.io/clients/http-client/calls/requests.html#specifying-a-body-for-requests

[Deactivated User]

body = TextContent("json", ContentType.Application.Json)

[Deactivated User]

seems that the doc about json in that page is outdated

[Deactivated User]

https://github.com/ktorio/ktor/issues/635#issuecomment-430225722

[Deactivated User]

Let me know if this works for you:

https://github.com/ktorio/ktorio.github.io/commit/e5e83bf152a2fd6f82e1583b687e8ea59082a63d

[coletz]

using TextContent with ContentType.Application.Json worked! Thanks

[ketilsan]

Im trying to achieve something similar, but the content-type i want to set is not recognised by ktor-contenttype-enum.

If I try to set it explicitly I get the same error as Dario.

I have to set the following content-type to call a external rest-endpoint:

application/xacml+json

[spand]

Maybe I am just using an old version but ContentType is a class here. Cant you just call the constructor with what you want it to be ?

[lukaswelte]

That is a really good question @ketilsan. I solved a similar issue by creating my own JsonFeature (I wanted to have the result directly parsed as JSON)

[ketilsan]

@spand hmm, maybe! I will try that.
@lukaswelte: I will have to try that if what Johannes suggested doesn´t work

[ketilsan]

thanks for the suggestions!

[ketilsan]

ContentType.create("myMimeType")

seems promising

edit: nah, was looking at the wrong ContentType-class

[cmgurba]

In those examples we are setting the content type header via body (for POST/PUT/PATCH etc), how can we set content-type for GETs given that the old way no longer works? 🤔

[coletz]

Not sure on what I'm going to say, but afaik content-type is for the type of the content in the request...and with a GET there is no content at all. If you need to set the content of the response that's not done with this