Hello, Is there any equivalent in ktor (client) for <interceptors>? I wish to inject `HttpHeaders.Au...

# ktor

[Guilherme Delgado]

Hello,
Is there any equivalent in ktor (client) for interceptors? I wish to inject HttpHeaders.Authorization in a few requests and I would like to avoid calling

header(HttpHeaders.Authorization, "Bearer $accessToken")

for each HttpRequestBuilder .
Thanks!

[louiscad]

Yep, what is currently called "features" can do it. I suggest you to check the related class in your IDE, and see the built-in ones that implement it.

[El Zhang]

Use defaultRequest{} https://ktor.io/docs/default-request.html#example

[Guilherme Delgado]

Thanks guys 👍 defaultRequest feature helped!

[Guilherme Delgado]

just one more quick question 😊, is it possible to add features to an already created client or it’s only possible upon declaration?

[El Zhang]

I haven't tried that, in case it disallows, there is a workaround to support your use case:

defaultRequest{ if(someConditions) { header(...) } }

[Guilherme Delgado]

ok I was asking because am providing the client as a singleton (KMM shared module with koin) and maybe I’ve to change a bit my DI since it seams I can’t “add” this feature in runtime (upon declaration I have no accessToken)

[Guilherme Delgado]

make it not singleton I guess it will solve my issue

[El Zhang]

OK, I had a exactly the same use case, you can pass a TokenProvider to the Ktor Client:

interface TokenProvider{  fun getToken(): String? }

defaultRequest { if(provider.getToken()!=null) { ... } }

[El Zhang]

(just a dummy code snippet, but should be good to get the point)

[Guilherme Delgado]

yup awesome 👍

[Guilherme Delgado]

(btw: it worked 🙂 )

[Rustam Siniukov]

1.6.0 will have build it Bearer Auth Provider https://youtrack.jetbrains.com/issue/KTOR-331

[louiscad]

Build it or built-in? 😅

[Rustam Siniukov]

built in, sorry my autocomplete =)