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kotlinlang

The official OAuth client sample is so bad... I get a lot of `This API is internal in ktor and should not be used. It could be removed or changed without notice.`  warnings for this `append` calls. :confused:

<https://github.com/ktorio/ktor-documentation/blob/0f2ef73cdc4fce483c2ee8e15c8995e6bdb4b5df/codeSnippets/snippets/client-auth-oauth-google/src/main/kotlin/com/example/Application.kt#L24-L28|https://github.com/ktorio/ktor-documentation/blob/0f2ef73cdc4fce483c2ee8e15c8995e6[…]nt-auth-oauth-google/src/main/kotlin/com/example/Application.kt>

Hi, sorry for the inconvenience. This because the `StringValuesBuilder` class that exposes the `append` function is incorrectly marked with the `InternalAPI` annotation (<https://ktor.io/docs/request.html#headers>). This should be fixed in v2.0.0.